Nature reserves in Illinois
Land set aside and kept that way — refuges, game lands and wilderness, each held by somebody who says so on the record.
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- Goose Lake Prairie State Natural Area
- Kennicott GroveNational Register
- Chautauqua National Wildlife Refuge - Cameron Unit
- Moraine Hills State Park
- Lake Murphysboro State Park
- Shabbona Lake State Recreation Area
- Apple River Canyon State Park
- Trail of Tears State ForestBuilt 1929
- Matthiessen State Park
- Lowell ParkNational Register
- Moraine View State Recreation Area
- Burden Falls WildernessBuilt 1990
- Matthiessen State Park
- James "Pate" Philip State Park
- Ladd Arboretum
- Rend Lake State Fish and Wildlife Area
- Buffalo Rock State Park
- Beall Woods State Park
- Bell Smith Springs Recreation Area
- Carpenter ParkBuilt 1921
- Kishwaukee River State Fish and Wildlife Area
- Little Grand Canyon
- Chicago Portage National Historic Site
- Horseshoe Lake State Park
- Sam Parr State Fish and Wildlife Area
- White Pines Forest State Park
- Hamilton County State Fish and Wildlife Area
- Sielbeck Forest State Natural Area
- Nipper Wildlife SanctuaryBuilt 1995
- Niabi Zoological Preserve
- Crawford County State Fish and Wildlife Area
- Lake Depue State Fish and Wildlife Area
- Rock Cut State ParkBuilt 1957
- Ramsey Lake State Recreation Area
- Beall Woods State Park
- Chain O'Lakes State Park
- Sam Dale Lake State Fish and Wildlife Area
- Johnson Sauk Trail State Park
- Donnelley State Fish and Wildlife Area
- Illini State Park
- Lincoln Trail State Park
- Alfred Caldwell Lily Pool
- Robert Allerton Park
- Heidecke Lake State Fish and Wildlife Area
- Camp Shabbona Woods
- Cape Bend State Fish and Wildlife Area
- Iroquois County State Wildlife Area
- Piney Creek Ravine Nature Preserve
- Volo Bog State Natural AreaBuilt 1970
- Green River State Wildlife Area
- Beaver Dam State Park
- Horseshoe Lake State Fish and Wildlife Area
- Gensburg - Markham Prairie Nature Preserve
- McDowell Grove Forest Preserve
- Kickapoo State Recreation Area
- Sand Prairie-Scrub OakBuilt 1970
- Weinberg-King State Park
- Margery Adams Wildlife Sanctuary
- Lowden State Park
- Franklin Creek State Natural Area
- Giant City State ParkBuilt 1927
- Adeline Jay Geo-Karis Illinois Beach State Park
- Castle Rock State Park
- Bay Creek Wilderness
- Weston Cemetery Prairie Nature Preserve
- Morton ArboretumBuilt 1922
- Kankakee River State Park
- Mautino State Fish and Wildlife Area
- Mississippi Palisades State ParkBuilt 1973
- Prairie Ridge State Natural Area
- Des Plaines State Fish and Wildlife Area
- Revis Hill Prairie Nature PreserveBuilt 1973
- Fults Hill Prairie Nature PreserveBuilt 1970
- Spring Lake State Fish and Wildlife AreaBuilt 1950
- Isle a la Cache County Forest Preserve
- Perkins Woods Forest Preserve
- Busse Forest Nature Preserve
- Howards Hollow Seep Nature PreserveBuilt 1990
- Iroquois Woods Nature Preserve
- Farmdale Reservoir Recreation Area
- Vermont Cemetery Prairie Nature Preserve
- Seymour Simon Preserve
- Windfall Prairie Nature Preserve
- Fort Daniel Conservation Area
- Hegewisch Marsh
- Doris Westfall Prairie Restoration Nature Preserve
- Spitler Woods State Natural Area
- Turnbull Woods
- American Beech Woods Nature Preserve
- Forest Glen Seep Nature Preserve
- Emiquon Preserve
- Spirit Trail Park
- Gurgens ParkBuilt 1970
- Horseshoe Bottom Nature Preserve
- Pioneer Park Forest Preserve
- Big Woods County Forest Preserve
- Culver Forest Preserve
- Wentworth Woods
- Mackinaw River State Fish and Wildlife Area
- Willow Wood Park
- Deer Grove Forest Preserve
- Emily Oaks Nature Center
- Saline County State Fish and Wildlife Area
- Riverside ParkBuilt 1965
- Burning Star State Fish and Wildlife Area
- Weldon Springs State Park
- Arlene Shoemaker Forest Preserve
- Eggers Grove
- Brownell Woods
- Joliet Iron Works Historic Site
- Seavey Ditch Restoration project
- Tuttle Clarkson Natural Area
- Kingsbury Park District Nature Preserve
- Palos Preserves
- Johnson Creek Recreation Area
- Wes Block Trailhead
- Rutland Forest Preserve
- Santa Fe Prairie
- Allison Woods
- Fondulac Reservoir
- Gifford Pheasant Habitat Area
- Shannon Bayou
- Milan Bottoms
- Timber Ridge Forest Preserve
- Linne Woods
- Edgebrook Woods
- Lower Cache River Access Area
- Ottawa Trail Woods South
- Ballard Nature Center
- Iroquois Woods
- Buffalo Park Forest Preserve
- Bowes Creek Woods Forest Preserve
- Lake In The Hills Fen Nature Preserve
- Millbrook North Forest Preserve
- Blackwell Campground
- Oakwood Hills FenBuilt 1986
- Wolf Lake Overlook
- Horizon Farm
- Bartel Grassland Land and Water Reserve
- LIB Conservation Area
- Watersmeet Woods
- Mill Creek Natural Area
- Laona Heights Nature Preserve
- Hastings Lake Forest Preserve
- Izaak Walton League of America Des Plaines Chapter 206
- North Salt Creek County Forest Preserve
- Everett McKinley Dirksen Park
- Maramech Forest Preserve
- Michael W. Wolff Memorial Wetlands
- Dam No. 1 Woods-East
- Fel-Pro RRR Conservation Area
- The Preserve of Highland ParkBuilt 2020-11
- Bird & Butterfly Sanctuary
- Max McGraw Wildlife Foundation
- Belleau Lake Preserve
- McClaughry Springs Woods
- Walden West Land and Water Reserve
- Thaddeus S. "Ted" Lechowicz Woods
- Lockport Prairie Nature Preserve
- Songbird Slough Forest Preserve
- Beck Lake
- Timber Ridge Forest Preserve
- Cannonball Sedgemeadow Forest Preserve
- Shoal Creek Nature Conservation Area
- Hidden Oaks Conservation Area
- Fransen Nature Area
- Chautauqua Bottoms
- Ferson Creek Fen Nature Preserve
- Bachelor's Grove Woods
- Coal Hollow Park
- Bowes Creek Greenway
- Weaver ParkBuilt 1971
- Lockwood Park
- Perry Nature Preserve
- Dan Ryan Woods - Center
- Pekin Lake State Fish & Wildlife Area
- Spoon River State Forest
- Kishwaukee Gorge South Forest Preserve
- Lyons Prairie and Marsh
- Salt Creek Woods
- Middle Fork Woods Nature PreserveBuilt 1999
- Elliot Woods Park
- Dan Ryan Woods - 91st Street
- Stoney Ford Woods
- Millington Forest Preserve
- Forest Preserve District of Cook County
- Manito Prairie Nature Preserve
- Boger Bog Conservation Area
- Forest Preserve District of Cook County
- Montrose Point Bird Sanctuary
- Oak-Hickory Forest Preserve
- Argyle Lake State Park
- Miller Riverfront Park
- Hinchcliff Memorial Forest Preserve
- Grassy Lake Forest Preserve
- Lake Chaminwood Preserve
- Deer Grove Forest Preserve - West
- Jack E. Cook Park and Forest Preserve
- Kankakee Sands Preserve
- La Grange Park Woods
- Mundsinger Woods
- Bolcum Road Wetlands Forest Preserve
- Trelease Prairie
- Michael J. O'Malley Preserve
- Hanover Forest
- Burnham Prairie
- M.J. Rhymer Family Nature Preserve
- Fischer Woods Forest Preserve
- Grunwald Farms Forest Preserve
- Irish Oaks
- Elmwood Dunes Preserve
- Starved Rock Nature Preserve
- Sunset Bridge Meadow
- North Dunes Nature Preserve
- Shanahan Grove Park
- Kishwaukee Fen Nature PreserveBuilt 1993
- James S. Boan Woods
- Wymann Nature Preserve
- Helm Woods Forest Preserve
- Moffet Woods
- Swallow Cliff Woods South
- Sibley Grove Nature Preserve
- Marovitz Savannah Natural Area
- Camp Hutchins
- Ira and Reatha T. Post Wildlife Sanctuary
- Gander Mountain Forest Preserve
- Clark Street Beach Bird Sanctuary
- Oakhurst Forest Preserve
- Bates Fen Nature Preserve
- Thomson - Fulton Sand Prairie Nature Preserve
- Salt Creek Park Forest Preserve
- St. Paul Woods
- Des Plaines Riverway Forest Preserve
- Simpson Township Barrens
- Freeman Forest Preserve
- Ulrich Wildlife Preserve
- Mickelson's Landing
- Pecatonica Woodlands Preserve
- Rice Algific Slope
- Walter E. Heller Nature Preserve
- Glen Oak Park
- Swayne Hollow SNA
- T-Lake State Fish and Wildlife Area
- River Trail Nature Center
- Oriole Grove Forest Preserve
- Hibbard Woods Preserve
- West DuPage Woods Forest Preserve
- Fern Rocks Nature Preserve
- Bates Fen Nature Preserve
- Camp Tomo-Chi-Chi Knolls Forest Preserve
- Paddock Woods
- Markham Prairie - East Nature Preserve
- Pleasant Valley
- Hooper Branch Savanna Nature Preserve
- Merdel/Ford Property
- Seavey Ditch Restoration Project
- Sauk Trail Reservoir
- Tall Grass Prairie Recreation Area
- James Woodworth Prairie Preserve (Peacock Prairie)
- Palos Fen Nature Preserve
- Goodenow Grove Nature Preserve
- Beall Woods Nature Preserve
- Hunt Club Prairie Wetland
- Tower Lakes Fen Nature Preserve
- Reddick Hollow NA
- Jerome Huppert Woods
- Winnebago County Forest Preserve Headquarters
- O'Hara Woods Nature Preserve
- Glacial Park Conservation Area
- Cypress Creek National Wildlife Refuge
- Levi and Esther Fuller Memorial Forest Preserve
- Duck Farm Forest Preserve
- Kishwaukee River Forest Preserve
- Gunnar Anderson County Forest Preserve
- Shawl Wildlife Preserve
- Lind-McGeachie Preserve
- E Dora Bohm Memorial Nature Preserve
- Pine Dunes Forest Preserve
- Sommer Farm
- Romeoville Prairie Nature Preserve
- Uptown Natural Area
- Jackson Falls
- Silver Creek Woods Preserve
- Blackberry Creek Forest Preserve
- Veteran Woods County Forest Preserve
- Hazelwood Park
- Reed Wildlife State Habitat Area
- Concannon Conservation Area
- Che-Che-Pin-Qua Woods
- R. Robert Funderburg Forest Preserve
- Sleepy Hollow Ravine Forest Preserve
- Glenwood Park Forest Preserve
- Howard Colman Hall Creek PreserveBuilt 2010
- Barrens
- Sannauk Forest Preserve
- Dwyer Woods
- Kennicott's Grove Nature Preserve
- Patton Woods - Middle Fork River Forest Preserve
- Big Rock Forest Preserve
- Cedar Creek Conservation Area
- Everett Farm Nature Preserve
- Dufield Pond Conservation Area
- Letcher Basin Land and Water Reserve
- Wanless Park
- Grigsby Prairie
- Laona Heights Forest Preserve
- Merritt Prairie Forest Preserve
- Hazelwood Forest Nature Preserve
- Lambs Woods
- L & M Prairie Nature Heritage Landmark
- Harper's Woods Nature Preserve
- South Pond Natural Area
- Canton Youth Acres
- Franklin Creek Headwaters
- Willowbrook Forest Preserve
- Blue Raider Park
- Rolling Knolls
- Busey Woods
- Spring Lake Preserve
- Diversey Natural Area
- MacArthur Woods Forest Preserve
- Forest Glen Woods
- Skokie River Nature Preserve
- Calamus Lake Nature Preserve
- Freeport Wetland Preserve
- Kloempken Prairie
- Kilbuck Bluffs Forest Preserve
- Kishwaukee Gorge North Forest Preserve
- Indian Gardens
- Halsted Woods
- St. Paul Woods
- Howard D. Colman Dells Nature Preserve
- Sterne's Fen Nature Preserve
- Weigh Station Prairie
- Bonnies Prairie Nature Preserve
- Skokie River Woods
- Plum Creek Natural Area
- Sterling Lake Forest Preserve
- Jurgensen Woods
- Forest Preserve District of Cook County
- Tallmadge Sand Forest Land and Water Reserve
- Dickenson Site
- Thistle Hills Land and Water Reserve
- North Park Prairie
- Highmoor Park Nature Preserve
- Tucker Millington Fen Forest Preserve
- Banks/Young Wildlife Preserve
- LeSuer Nature Preserve
- Mskoda Land and Water Reserve
- Griswold Conservation Area
- Cold Springs Park
- Schuth's Grove
- Dr. Frank & Aagot Green Wildlife Sanctuary
- Max McGraw Wildlife Foundation
- Liberty Prairie Nature PreserveBuilt 1990
- Indian Boundary Nature Play Center
- Noth Salt Creek Forest Preserve;North Salt Creek County Forest Preserve
- White Eagle Woods North
- Schiller Woods East
- Forest Preserve District of Cook County
- Almon Underwood Prairie Forest Preserve
- Marian R. Byrnes Park
- Little Rock Creek Forest Preserve
- Irene C. Hernandez Family Picnic Grove
- Hampshire Forest Preserve
- Fox Hollow Forest Preserve
- Simpson's Prairie
- Riverwood Forest Preserve
- Colored Sands Forest Preserve
- Spring Valley Nature Sanctuary
- Columbia Woods
- Eisenmayer Sand Prairie Natural Heritage Landmark
- McCune Sand Prairie
- Gompers Park Lagoon
- Huyck's Grove Preserve
- Hidden Creek Nature Sanctuary
- Pembroke Savanna Nature Preserve
- Otter Creek Forest Preserve
- Half Day Forest Preserve
- Henneberry Forest Preserve
- Wapello Land & Water Reserve
- Forest Preserve District of Cook County
- Bartlett Prairie & Wetland
- Max and Edward Rose State Habitat Area
- Sweet Woods
- North Park Village Natural Area
- Merwin Savannah Nature Preserve
- Moon Preserve
- South Hart Road Grassland Natural Area
- Otter Creek Bend Wetland Park
- Elgin Shores Forest Preserve
- Schiller Playfield
- Buena Park
- Robinson Woods - South
- Hank Gianvecchio Natural Habitat Area
- Former Elliot Golf Course
- Churchill Prairie Nature Preserve
- Sauk Trail Woods
- Crevecoeur Nature Preserve
- Bliss Woods Forest Preserve
- The Grove
- Stephen A. Forbes State Recreation Area
- Ipson Road Conservation Area
- Belleau Lake
- Blackwell Forest Preserve
- Fox Ridge State Park
- Calvin R. Sutker Grove
- Middle Fork State Fish and Wildlife Area
- Loda Pheasant Habitat Area
- Belleau Wood Preserve
- Fisher Woods
- Forest Preserve District of Cook County
- Maywood Grove
- Kent Fuller Air Station Prairie
- COMLARA Park
- Burnham Wildlife Corridor
- Turtle Wetlands
- Messerling Wildlife Preserve
- Mitchell MeadowsBuilt 2006-4-19
- Willoughby Farms Forest Preserve
- Hidden Lake Forest Preserve
- Funks Grove Nature PreserveBuilt 1985
- Carolyn Goetz Wetlands Preserve
- Deer Grove Forest Preserve - East
- Wayne Grove Forest Preserve
- Indian Island
- Elburn Forest Preserve
- Garfield Park Natural Area
- Schessler's Fen Forest Preserve
- Hampshire South Forest Preserve
- River Bend Forest Preserve
- Cardinal Creek Forest Preserve
- Raccon Lakes
- Thorn Creek Headwaters Preserve
- Swallow Cliff Woods North
- Massasauga Prairie Nature Preserve
- Oak Ridge Forest Preserve
- King's Grove
- Double Branch Hole
- Spring Bluff Forest Preserve
- Fullersburg Woods Forest Preserve
- Forest Preserve District of Cook County
- Seward Bluffs Forest Preserve
- Busse Lake Boating Center Grove
- Lost Flora Fen on Racoon Creek
- Dunning Read Natural Area
- Kankakee National Wildlife Refuge and Conservation Area
- Margaret Guzy Pothole Wetlands State Natural Area
- Newark Forest Preserve
- Stephen R. Keay Nature Learning Center
- Heron Hill Rookery (Keep Out)
- Chief Shabbona Forest Preserve
- Winding Creek
- Rod and Gun Club
- Pecatonica River Forest Preserve
- Chicago Ridge Prairie Nature Preserve
- Salt Creek Greenway Forest Preserve
- White Eagle Woods South
- Willow Springs Woods
- Glenbrook North High School Prairie Nature Preserve
- Poplar Creek Forest Preserve
- Red Oak Nature Center
- Wayside Woods Preserve
- Campground Road Woods
- Friends Creek Conservation Area
- Irving Park Road Canoe Landing
- North Park Village - Walking Stick Woods Natural Area
- Hybernia Nature Preserve
- Yonder Prairie
- Siloam Springs State Park
- Hidden Acres at Homer Lake Forest Preserve
- Whistler Woods
- Redwing Slough Forest Preserve
- Jean and John Greene Nature PreserveBuilt 2023-03-06
- Raven Glen Forest Preserve
- Shortline Railroad Prairie
- Gateway Wetlands
- Hoscheit Woods Forest Preserve
- Willam and E. Bohm Memorial Nature Preserve
- Forest Way Grove
- Silver Creek Conservation Area
- Tyler Creek Forest Preserve
- Carl R. Hanson Woods
- Jackson Hole Natural Area
- Walnut Creek Conservation Area
- Calumet City Prairie Nature Preserve
- Hannaford Woods-Nickels Farm Forest Preserve
- Spring Lake Nature Preserve
- Espenscheid Forest Preserve
- Banner Marsh Fish and Wildlife Area
- Kingsley Prairie
- Elton E Fawks Bald Eagle Refuge Nature Preserve
- Rainbow Beach Dunes South Natural Area
- Brunner Family Forest Preserve
- Cermak Woods
- Almond Marsh Forest Preserve
- Lake Carina Forest Preserve
- Grand Reserve Prairie
- Canton Lake
- Burnham Wildlife Corridor
- Cary Junior High Prairie Nature Preserve
- ParkLands Nature Preserve
- Orland Grassland
- Northfield Park District
- Douglas E Wade Prairie
- Hayes Woods Preserve
- Mallard Lake Forest Preserve
- Ross Wildlife Area
- Schweitzer Woods Forest Preserve
- Illinois River State Fish and Wildlife Area
- Bystricky Prairie
- Skip Anderson Big Timber Preservation Area
- Richardson Wildlife Preserve
- Dixie Briggs Forest Preserve
- Belmont Prairie Nature Preserve
- Whalon Lake Park
- Sweeney Woods Preserve
- Dewey Helmick Nature Preserve Addition to Old Plank Road Prairie Nature Preserve Buffer
- Dan Ryan Woods - North
- Mill Creek Forest Preserve
- Hollis Park
- Ellynwood Nature Preserve
- Thirty-First Avenue Park
- Lyon Forest Preserve
- McCormick Woods Preserve
- Rollins Savanna Forest Preserve
- Sangamon River State Natural Area
- Plum Grove Nature Preserve
- Jelkes Creek Forest Preserve
- Forest Preserve District of Cook County
- Steward Pheasant Habitat Area
- Pine Hollow Ecoligical Area
- Dan Ryan Woods - Center
- Protected Grassland
- Paintbrush Prairie Nature Preserve
- Bois du Sangamon Nature Preserve
- Elizabeth Lake Nature Preserve
- Jay Woods Forest Preserve
- Hurd Tract
- Blue Star Memorial Woods
- Old School Forest Preserve
- Stemler Cave Woods Nature Preserve
- John E. Traeger Preserve
- Northwestern Woods
- Les Arends County Forest Preserve
- Palos Park Woods
- Illinois Department of Natural Resources
- Klehm Arboretum and Botanic Garden
- Trails of Woods Creek Natural Area
- Pickerill-Pigott Forest Preserve
- Douglas Hart Nature Center
- Shoe Factory Road Woods
- Jurgensen Woods Nature Preserve
- Stubblefield Woodlots Nature Preserve
- Miller Meadow South
- Eagle Creek State Park
- Blackberry Creek South F.P.
- Cranberry Slough Nature Preserve
- Plank Road Meadow
- Van Patten Woods Forest Preserve
- Bald Hill Prairie Preserve
- Wood Dale Grove Forest Preserve
- Beck's Wood
- Lodge County Park
- Hickory Bottoms
- Willow Park
- Bunker Hill
- Wayside Woods
- Lake Run Forest Preserve
- Dam No. 1 Woods-West
- Ravine Park
- Lake Le-Aqua-Na State Park
- Independence Grove
- Creighton Woods Park
- Pecatonica Prairie Trail
- Dayton Bluffs Preserve
- Callahan Grove
- William & Gayle Keefer Nature Reserve
- Forest Preserve District of Cook County
- Black Partridge Woods Nature Preserve
- Nieman Marsh Preserve
- Sundrop Prairie Nature Preserve
- Deer Grove West Forest Preserve
- Old Plank Road Prairie Nature Preserve
- Dropseed Prairie Nature Preserve
- Jelkes Creek Bird Sanctuary
- Montrose Beach Dunes Natural Area
- Ellison Creek Prairie
- Riverhill Nature Preserve
- Kishwaukee Headwaters Conservation Area
- Alden-Sedge Meadow Conservation Area
- Harms Woods-South
- Black Walnut Creek Preserve
- Gar Creek Trail and Prairie Restoration
- Sandy Hill Slough
- Oquawka State Wildlife Refuge
- Boloria Meadows
- McCormick Bird Sanctuary
- Mouson Park
- Union County State Fish and Wildlife Area
- West Ridge Nature Preserve
- Dunham Forest Preserve
- Lockport Praire East Preserve
- Thaddeus Stubblefield Grove Nature PreserveBuilt 1993
- Warrenville Grove County Forest Preserve
- Camp Pine Woods
- Mayslake Forest Preserve
- Joe Orr Woods
- Blackberry Maples Forest Preserve
- Dewey Helmick Nature Preserve Addition to Old Plank Road Prairie Nature Preserve Buffer
- Chipilly Woods
- Sand Ridge Nature Preserve
- Two Rivers Forest Preserve
- Forest Preserve District of Cook County
- Jackson Creek Preserve
- Forest Preserve District of Cook County
- Seavey Ditch Restoration Project
- Bohm Woods Nature Preserve
- Richard Young Forest Preserve
- Meacham Grove Forest Preserve
- River Road Forest Preserve
- Maywood Grove Preserve
- Forest Preserve District of Cook County
- Princess Mine Algific Slope
- Robert Ridgeway Grasslands
- P. A. Nehring Forest Preserve
- Eaton PreserveBuilt 2022-06-24
- Loda Cemetery Prairie Nature PreserveBuilt 1983
- Bennett's Terraqueous Gardens
- Hedge Apple Woods Nature Preserve
- Wayne Lehnert Preserve
- Library Springs Natural Area
- Calvin and Sophia Ferguson Forest Preserve
- Lake Avenue Woods - East
- Bunker Hill
- Schiller Woods West
- Blackhawk Springs Forest Preserve
- Van Arnam's Island
- Grainger Woods Conservation Preserve
- Illinois Department of Natural Resources
- Pounds Hollow Recreation Area
- Rall Woods State Natural Area
- Wigwam Hollow
- Webster Wildlife Site
- Mirror Lake
- Catherine Chevalier Woods
- Green Valley Camp
- Glenn Green Park
- Fourth Lake Fen Forest Preserve
- Timber Ridge Forest Preserve
- Bartlett Woods Nature Preserve
- Salamander Springs
- Tekakwitha Woods Forest Preserve
- Rockford Rotary County Forest Preserve
- Ozark Hills Nature PreserveBuilt 1974
- Spring Slough
- Prairie State Eagle Refuge State Natural Area
- Churchill Woods Glacial Ridge Forest Preserve
- Voyagers Landing Forest Preserve
- Raceway Woods Forest Preserve
- Glenview Woods
- Forsythe Woods County Forest Preserve
- Sand Ridge Savanna Nature Preserve
- Hickory Grove Riverfront
- Army Trail Nature Center
- Nippersink Forest Preserve
- Sedge Meadow Forest Preserve
- Lone Grove Forest Preserve
- Hunters Woods
- Grant Creek Prairie Nature Preserve
- Subat Forest Preserve
- Dan Ryan Woods - East
- Natasha D Brandt Nature Preserve
- North Branch Conservation Area
- The Hollows Conservation Area
- Forever Fields
- Stillman Nature Center
- Glenwood Woods South
- Heron Pond
- Loyola Dunes
- Yorkville Prairie Nature Preserve
- Wadsworth Prairie Nature Preserve
- Lyons Woods Forest Preserve
- North Pond Nature Sanctuary
- Purple Martin Sanctuary
- Tapley Woods Conservation Area
- Poplar Creek Forest Preserve
- McKiski Forest Preserve
- Harris Forest Preserve
- Half Day Forest Preserve
- Manito State Habitat Area
- Cricket Creek County Forest Preserve
- Kenyon Farm Forest Preserve
- West Branch Forest Preserve
- Pederson Preserve
- Humiston Woods Nature Center
- Tower Road Boat Launch
- Racoon Grove Nature Reserve
- Roberts Cemetery Savanna Nature Preserve
- Hickory Grove Forest Preserve
- La Rue Swamp Nature Preserve
- War Bluff Valley Sanctuary
- Prairie Ridge Conservation Area
- Burnidge Forest Preserve
- Young Wildlife Preserve
- G.A.R. Woods
- Plum Valley Ravines
- Carruthers Nature Preserve
- Ping Tom Natural Area
- Prairie Preserve on Belle Foret Drive
- Brookfield Woods Preserve
- Timber Ridge Forest Preserve
- Ed Meagher Greenway
- Ottawa Trail Woods North
- Indian Hill Forest Preserve
- Hickory Knolls Nature Preserve
- Heritage Canyon Park
- Barrington Bog Nature Preserve
- Max McGraw Wildlife Foundation
- Miami Woods
- Potawatomi Woods
- Blackmon Wildlife Preserve
- Edna Edwards Burnett Land and Water Reserve
- McDonald Woods Forest Preserve
- Fox Bluff
- Waukegan Savanna Forest Preserve
- Swift Prairie Forest Preserve
- Black Partridge Park
- Salt Lick Point Land and Water Reserve
- Dam No. 1 Woods-West
- Crow Valley Campground
- West Skokie Nature Preserve
- Poplar Creek Forest Preserve
- S.H. West County Park
- Beach Prairie Preserve
- Elwood Wildlife Preserve
- Searls Park Prairie Nature Reserve
- Bird Watch Area
- Wadsworth Savanna Forest Preserve
- Tomlinson Pioneer Cemetery Prairie Nature Preserve
- Victoria State Habitat Area
- John Husar I&M Canal
- Anna Page Park
- Nippersink Canoe Base County Park
- West Branch Forest Preserve
- Kidd Lake State Natural Area
- White Pines Forest Nature Preserve
- Wolf Oak Woods Preserve
- Jubilee College State Park
- Franklin Addition
- Horseshoe Mound Preserve
- Pecatonica Ridge Preserve
- Belleau Woods Forest Preserve
- Trelease Woods
- Loud Thunder Forest Preserve
- Buffalo Prairie State Fish and Wildlife Area
- Silver Creek Nature Area
- Ridge Park Wetlands
- Lakeview Nature Area
- North Hart Road Grassland Natural Area
- Kenyon-Baller Woods Preserve
- Glen Oak County Forest Preserve
- Erickson Woods
- Rock Island Trail
- Middlefork Savanna Forest Preserve
- Hennen Conservation Area
- Edward L Ryerson Conservation Area
- Thomson Prairie
- Wagner Fen Nature Preserve
- Lily Cache Greenway
- Potowatomi Forest Preserve
- Hickory Creek Forest Preserve
- Harrison Benwell Conservation Area
- West Branch Forest Preserve
- Fullerton Woods
- Spears Woods
- Miller Meadow North
- Springbrook Prairie
- Park 565 "Indian Ridge Marsh"
- Waa Kee Sha Park
- Holly Park
- Thatcher Woods Trailside Meuseum of Natural History
- Glenwood Woods North
- Bat Shelter
- Steward Park
- Tampier Lake
- Caldwell Woods
- Robeson Hills Nature PreserveBuilt 1972
- Kestrel Ridge Forest Preserve
- Hollenback Sugarbush F.P.
- Fox Hollow Forest Preserve
- Fitchie Creek Forest Preserve
- Lake Renwick Preserve - Turtle Lake Access
- Meacham Creek Park
- Middlefork Savanna Forest Preserve
- Buffalo Creek Forest Preserve
- Beaver Bluff Conservation Area
- Meacham Wildlife Preserve
- Afton Forest Preserve
- Harms Woods-Central
- Lexington Preserve
- Mermet Swamp Nature Preserve
- Miller Meadow South
- Lusk Creek Canyon Nature Preserve
- Hitts Siding Prairie Nature Preserve
- The Prairie at Walnut Grove
- Lake Renwick Heron Rookery Nature Preserve
- Lakeland Park
- Park No. 595
- Harms Woods-North
- Sunset Ridge Woods
- Dublin Highlands State Habitat Area
- Lions Woods
- Parker Fen Nature Preserve
- Jack Wolf Memorial Fish Hatchery
- Fel-Pro RRR Conservation Area
- Winston Tunnel State Natural Area
- Tinley Creek Woods
- Kickapoo Creek Recreation Area
- Eagle's Nest Land and Water Preserve
- Gavin Bog and Prairie
- Mill Creek Greenway
- Kline Creek Farm
- Lake Como State Natural Area
- Boone Creek Conservation Area
- Axehead Lake
- Indian Road Woods Preserve
- Wolf Road Prairie Nature Preserve
- Prairie Oaks Forest Preserve
- Chippewa Woods
- Rush Creek Conservation Area
- Willam C Drda Woods Nature Preserve
- Carl N. Becker Savanna Nature Preserve
- Binnie Forest Preserve
- Romeoville Prairie County Forest Preserve
- Dan Ryan Woods - Center
- Oxbow Ridge at River Bend Forest Preserve
- Willow Creek Natural Area
- Stone Bridge Forest Preserve
- Thatcher Woods
- Old Plank Road Prairie Nature Preserve
- Prairie Pothole
- Saw Wee Kee Park
- Middlefork Farm
- Hawthorne Hills Nature Center
- North End Gun Club
- Schiller Woods South
- Lincoln Trail Homestead State Park
- Elkhorn Creek Biodiversity Preserve
- Huntley Marsh
- Harms Flatwoods Nature Preserve
- John T McNaughton Park
- Sullivan Woods
- Wadsworth Savanna Forest Preserve
- South Shore Nature Sanctuary
- Hitchcock Woods Forest Preserve
- Hidden Pond Woods
- Lucky Seven Duck and Deer Inc
- Route 137 Open Space
- City Line Ravine
- South Barrington Conservancy
- Lake Carina Forest Preserve
- Rainbow Beach Dunes
- Brewster Creek Forest Preserve
- Rockton Bog Nature Preserve
- Schiller Woods East
- Little Rock Creek State Natural Habitat
- Sun Lake Forest Preserve
- Hinkle Prairie Natural Heritage Landmark
- Windy Knoll Conservation Area
- Far Field Preserve
- Florsheim Park Nature Preserve
- Hartman Hunting Club
- Kingsbridge Arboretum
- Trailside County Forest Preserve
- New Crystal Lake Club National Heritage Landmark
- Lake Avenue Woods-West
- Berkeley Prairie
- Heron Woods State Habitat Area
- Surrey Lane Preserve
- Crabtree Preserve
- Turnbridge Wetland
- Ridgetop Hill Prairie Nature Preserve
- Hill Street Nature Center
- Tryon Creek Woods
- Crow Island Woods
- Tower Road
- Trail Woods Creek Natural Area
- Martha's Woods
- Casper Bluff Land and Water Reserve
- Brown Conservation Park
- Boyds Hollow Woods
- Fullerton Park Forest Preserve
- Kieselburg Forest Preserve
- Wingate Prairie Nature Preserve
- Shuh Shuh Gah Canoe Launch
- Oxbow Springs
- Spring Bay Fen State Natural Area
- Dan Ryan Woods - South
- Van Horne Woods Forest Preserve
- Brookdale Conservation Area
- Derwen Mawr Nature Preserve
- Kickapoo Park
- Knute Olson Forest Preserve
- Poag Sand Prairie
- Hononegah Forest Preserve
- Black Partridge Woods
- LaBagh Woods
- Braeburn Marsh Forest Preserve
- Independence Park
- Bluff Spring Fen
- Winfield Mounds Forest Preserve
- Henry Eilers Nature Preserve
- Clayton Andrews Forest Preserve
- Mississippi Sanctuary/Olin Nature Preserve
- Russel Woods
- Illinois Beach Nature Preserve
- Muirhead Springs Forest Preserve
- Mill Creek Forest Preserve
- Birchwood Park
- Clara Dietz Bird Sanctuary
- Cotton Creek Marsh Nature PreserveBuilt 1982
- Somme Prairie Grove Nature Preserve
- Weingart Rd Sedge Meadow Nature Preserve
- Forest Preserve District of Cook County
- Shoe Factory Road Woods
- Snakeden Hollow State Fish and Wildlife Area
- Forest Preserve District of Cook County
- Quercus Woods Preserve
- Fox River Forested Fen Forest Preserve
- Beaver Island
- Marl Flat Forest Preserve
- Norris Woods Nature Preserve
- Barnhart Prairie Restoration
- Grassy Slough Preserve
- Buffalo Trace Prairie
- Wentworth Prairie
- California Park Natural Area
- Hawk Hollow Forest Preserve
- Freeport Prairie Nature Preserve
- MacQueen Forest Preserve
- Falcon Ridge Park
- Powers Creek Conservation Area
- Harry A. & Fanny B. Severson Dells Forest Preserve
- Deer Run Forest Preserve
- Conservation Corridor
- Orland Grassland South
- Sand Creek Conservation Area
- Mississippi River Sand Hills State Natural Area
- Wolf Creek State Park
- Kenneth L. Schroeder Wildlife Sanctuary
- Roland Olson County Forest Preserve
- Dam No. 4 Woods-East
- Evans Field
- Camp Wokanda
- Pine Rock Nature Preserve
- Butterfield Creek Headwaters Land and Water Reserve
- Monee Reservoir
- Shoe Factory Road Prairie Nature Preserve
- Double T State Fish & Wildlife Area
- Blackthorn Hill Nature Preserve
- Willoughby Farms Forest Preserve
- Black Crown Marsh State Natural Area
- West Chicago Prairie Forest Preserve
- Gaslight Park Bird & Butterfly Sanctuary
- Kloempken Prairie Preserve
- Lake Renwick Preserve - Copley Nature Park
- Brownfield Woods
- Rockland Wetlands