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| Adolphson Observatory |  | | Observatory of
Monmouth College in Monmouth. |
| Aero Observatory |  | | A private observatory. |
| Albion |  | | |
| Alma |  | | A town in Marion county. |
| Apple River |  | | |
| Astro-Physics |  | | Observing site of telescope maker Astro-Physics Inc. |
| Barrington Hills |  | | A town in Cook county. Site of International Year of Astronomy events. |
| Big Cigar Astronomy |  | | Club near South Beloit |
| Birmingham Astronomical Observatory |  | | A private observatory in Thompsonville. MPC designation H53. |
| Blackhawk Observatory |  | | A private observatory. |
| Bloomington |  | | A town in McLean county. |
| Bojarzin Observatory |  | | Near Springfield. |
| Bradley |  | | Home of the Kankakee Area StarGazers. |
| Braidwood Dark Sky Site |  | | Near Gardner. |
| Caledonia |  | | |
| Carbondale |  | | Home to some members of the Astronomical Association of Southern Illinois. |
| Carlyle Lake |  | | A site on the south-east shore of Carlyle Lake. Near the town of Carlyle. Used by members of the
St. Louis Astronomical Society
and the River Bend Astronomy Club. |
| Chamberlain Observatory |  | | A private observatory in Brighton. |
| Champaign/Urbana Astronomical Society Observatory |  | | An observatory of the CUAS. |
| Charleston |  | | |
| Chatham |  | | |
| Chicago |  | | Home of the Chicago Astronomical Society. |
| Claustonberry Observatory |  | | A private observatory near Marengo. |
| Cricket Hill |  | | Part of Lincoln Park. At
Montrose Harbor. |
| Crystal Lake |  | | |
| Danville |  | | A town in Vermilion county. |
| De Kalb |  | | Home of the Davis Hall Observatory at Northern Illinois University. |
| Dearborn Observatory |  | | Observatory of
Northwestern University.
|
| Decatur Area Astronomy Club |  | | An observing site of the Decatur Area Astronomy Club at
Friends Creek County Park. 20 miles NE of Decatur. |
| Decatur(IL) |  | | Home of Requarth Observatory of
Millikin University. Requarth Observatory is host of
public observing nights. |
| Dolan Lake |  | | Also known as the Hamilton County State Fish and Wildlife Area.
Used as an observing site by the Obsessed of the EAS
(Evansville Indiana Astronomical Society). |
| Doug Firebaugh Observatory |  | | A public observatory in Freeport, Illinois, partly funded by the
Planetary Studies Foundation. |
| Edwardsville Observatory |  | | Near Edwardsville. |
| Effingham |  | | A town in Effingham county. |
| Galena |  | | |
| Garden of he Gods Recreation Area |  | | A recreation area In
Shawnee National Forest. |
 | Gardner Camp |  | | A not-for-profit camp with youth astronomy programs. |
| Glencoe |  | | |
| Grayville |  | | |
| Green River State Wildlife Area |  | | Link. |
| Harrisburg |  | | |
| Harvey Observatory |  | | A private observatory. |
| Hawkeye Observatory |  | | A private observatory. |
| Heavens Gate Farm Observatory |  | | A private observatory near Beverly. Also home of the Two Rivers Spring Star Party. |
| Hennepin Canal Parkway State Park |  | | State park used by some members of the Naperville Astronomical Association. |
| Hickory Knolls Discovery Center |  | | An environmental
education center located in
James O. Breen Community Park in St Charles.
Also site of star parties held by OneDarkSky.com. |
| J. Weiskopf Observatory |  | | Observatory with free public observing in
Byron Forest Preserve District. |
| Kirkland |  | | |
| Knox College Observatory |  | | Observatory at Knox College. |
| Lake Katherine Nature Center |  | | Nature center in Palos Heights. Site of public observing sessions held by the Chicago Astronomical Society. |
| Lake Thunderbird |  | | A lake near Putnam. |
| Lake Zurich |  | | |
| Lanphier Observatory |  | | An observatory of the Sangamon Astronomical Society. Near Pleasant Plains. |
| Lily Lake Observatory |  | | A private observatory near the town of Lilly Lake. |
| Lincolnshire |  | | Also covers Deerfield which is home of the Skokie Valley Astronomers . |
| Lockport |  | | A town in Will county. |
| Lombard |  | | Forecast also covers Glendale Hieghts, Elmhurst, Villa Park, Addison, and Glen Ellyn. |
| Lone Wolf Observatory |  | | A private observatory near Varna. |
| Macomb |  | | |
| Mantese's Farm |  | | A private farm. |
| Marengo |  | | |
| Marion |  | | |
| Massbach Ridge |  | | |
| Megamark Observatory |  | | A private observatory. |
| Middle Fork River Forest Preserve |  | | Forest reserve and
International Dark Sky Park near Penfield. Used by the
Champaign Urbana Astronomical Society. |
| Moraine Valley Community College Observatory |  | | observatory of
Moraine Valley Community College. |
| Morton Grove |  | | Forcast also covers Glenview, Wilmette, Evanston, Skokie, Park Ridge, Niles, and Des Plaines. |
| Mount Jennings Observatory |  | | A private observatory somewhere around Manteno. |
| Mount Vernon |  | | A town in Jefferson. |
| NAA Caton |  | | A site of the Naperville Astronomical Association. A few miles from Newark, but 25 miles southwest of Naperville. |
| NAA Minooka |  | | An observing site of the Naperville Astronomical Association. |
| NAA Observatory |  | | An observatory of the Naperville Astronomical Association. Near Naperville. |
| NAA Ransom |  | | An observing site of the Naperville Astronomical Association. Near Ransom. |
| Nick Drew Observatory |  | | A private observatory near Hamel. |
| Northwest Suburban Astronomers |  | | The NSA is active in the area of Palatine/Hoffman Estates. |
| OneDarkSky.com Observation Site #1 |  | | A clearing off of Cobblers Crossing, in Elgin. Site of public star parties held by OneDarkSky.com. |
| Our Prairie Sky |  | | In Park Forest. |
| PACMO |  | | An observing site of the Popular Astronomy Club. |
| PICO |  | | A private observatory near Pana. |
| Paxton |  | | |
| Peck Farm Park |  | | Public viewing site for the Fox Valley Astronomical Society. In Geneva. |
| Peoria |  | | Home of the Peoria Astronomical Society and the
NorthMoor Observatory.
|
| Peotone |  | | |
| Prairie Skies Star Party |  | | Star party held at Camp Shaw-Waw-Nas-See. |
| Prairie State College |  | | College in Chicago Heights. |
| Principia College Astronomical Observatory |  | | Observatory of
Principia College. In Elsah. |
| Rockford |  | | Home of the Rockford Amateur Astronomers. |
| SWAOG Dark Site |  | | A site of the South West Astronomy Observers Group in Yorkville. |
| SWAOG Light Site |  | | A public observing site of the South West Astronomy Observers Group. In Wheaton. |
| Serena |  | | A town in La Salle county. |
| Shiloh Station Road |  | | |
| Site "M" |  | | A site of the Sangamon Astronomical Society.Near Ashland. |
| Smith Observing Site |  | | Near Round Lake Beach and about 15 miles west of Waukegan. |
| Stardust Observatory |  | | A private observatory. |
| Starved Rock State Park |  | | State park.
Used by some members of the Astronomical Society at the University of Illinois.
Also home of Astrofest, a star party held by the
Chicago Astronomical Society. |
| Stelle |  | | A community in Rogers Township, IL |
| Sterling |  | | |
| Streator |  | | |
| Sugar Grove Observatory |  | | An observatory of the
Twin City Amateur Astronomers. In the Sugar Grove Nature Center. |
| Sullivan Observatory |  | | A private observatory in Sullivan. |
| Sunny Knoll Observatory |  | | A private observatory in Port Byron. |
| TASS H (Droege) Observatory |  | | An observatory of the Amateur Sky Survey project. Near Batavia. |
| Taylor Dark Sky Site |  | | Near Yale. |
| The Decker-Grebner-Van Zandt Observatory |  | | Observatory maintained by the
Peoria Astronomical Society. In
Jubliee College State Park. |
| The Little Red School House |  | | A site used by the Chicago Astronomical Society. In Willow Springs. |
| The Lone Wolf Observatory |  | | A private observatory near Oak Lawn |
| The Stellar Shed |  | | A private observatory near Aledo. |
| Tinley Park |  | | A town in Cook county. |
| U-46 Planetarium |  | | Elgin School District Planetarium in Elgin. |
| Velveeta Valley Observatory |  | | Aka VVO, a private observatory in Pecatonica. |
| Viking Observatory |  | | A private observatory Near Galesburg. |
| Walnut Point State Park |  | | State park.
Used by some members of the Astronomical Society at the University of Illinois
and the Champaign Urbana Astronomical Society |
| Washington County State Recreational Area |  | | Recreation area. |
| Weinberg-King State Park |  | | State park near Augusta. |
| West Union |  | | |
| White Eagle Observatory |  | | A private observatory near Naperville. |
| Winchester |  | | |
| Wolf Creek State Park |  | | State park and site of public star parties held by the
Sandusky Valley Amateur Astronomy Club (SVAAC). |
| Woodstock |  | | |
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