| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Grace Abbott Homes | city | Illinois | United States | 41.86 | -87.66 | 830 | |
| Grace Manor | city | Illinois | United States | 42.13 | -87.85 | 830 | |
| Grafton | city | Illinois | United States | 38.97 | -90.43 | 406 | |
| Grand Boulevard | city | Illinois | United States | 41.81 | -87.62 | 830 | |
| Grand Chain | city | Illinois | United States | 37.25 | -89.02 | 367 | |
| Grand Crossing | city | Illinois | United States | 41.76 | -87.60 | 830 | |
| Grand Detour | city | Illinois | United States | 41.90 | -89.41 | 830 | |
| Grand Haven | city | Illinois | United States | 41.59 | -88.14 | 830 | |
| Grand Pass | city | Illinois | United States | 39.46 | -90.60 | 830 | |
| Grand Prairie | city | Illinois | United States | 41.58 | -88.17 | 830 | |
| Grand Ridge | city | Illinois | United States | 41.24 | -88.83 | 830 | |
| Grand Tower | city | Illinois | United States | 37.63 | -89.50 | 347 | |
| Grandview | city | Illinois | United States | 39.54 | -87.85 | 830 | |
| Grandview | city | Illinois | United States | 39.82 | -89.62 | 830 | |
| Grandview Acres | city | Illinois | United States | 39.91 | -91.39 | 830 | |
| Grandwood Park | city | Illinois | United States | 42.39 | -87.99 | 830 | |
| Graney | city | Illinois | United States | 38.83 | -89.91 | 830 | |
| Grange Hall | city | Illinois | United States | 42.36 | -87.96 | 830 | |
| Grange Hall | city | Illinois | United States | 37.82 | -89.32 | 400 | |
| Granite City | city | Illinois | United States | 38.70 | -90.15 | 406 | |
| Grant Park | city | Illinois | United States | 41.24 | -87.65 | 830 | |
| Grant Park | city | Illinois | United States | 42.23 | -89.09 | 830 | |
| Grant View Heights | city | Illinois | United States | 42.19 | -89.14 | 830 | |
| Grant Village | city | Illinois | United States | 41.82 | -87.60 | 830 | |
| Grantfork | city | Illinois | United States | 38.83 | -89.67 | 830 | |
| Grantsburg | city | Illinois | United States | 37.39 | -88.75 | 380 | |
| Granville | city | Illinois | United States | 41.26 | -89.23 | 830 | |
| Granville Gardens | city | Illinois | United States | 41.99 | -87.68 | 830 | |
| Grape Creek | city | Illinois | United States | 40.07 | -87.60 | 830 | |
| Grass Lake | city | Illinois | United States | 42.45 | -88.14 | 830 | |
| Graver Country Estates | city | Illinois | United States | 41.64 | -88.20 | 830 | |
| Grayland | city | Illinois | United States | 41.95 | -87.75 | 830 | |
| Graymont | city | Illinois | United States | 40.88 | -88.78 | 830 | |
| Graymoor | city | Illinois | United States | 41.52 | -87.67 | 830 | |
| Grays Corner | city | Illinois | United States | 38.64 | -87.72 | 830 | |
| Grayslake | city | Illinois | United States | 42.34 | -88.04 | 830 | |
| Grayville | city | Illinois | United States | 38.26 | -87.99 | 383 | |
| Great Lakes | city | Illinois | United States | 42.31 | -87.85 | 830 | |
| Green Acres | city | Illinois | United States | 39.89 | -89.67 | 830 | |
| Green Bay | city | Illinois | United States | 41.74 | -87.55 | 830 | |
| Green Brier | city | Illinois | United States | 38.91 | -87.91 | 830 | |
| Green Castle | city | Illinois | United States | 38.89 | -89.75 | 830 | |
| Green Creek | city | Illinois | United States | 39.20 | -88.52 | 830 | |
| Green Oaks | city | Illinois | United States | 42.29 | -87.90 | 830 | |
| Green River | city | Illinois | United States | 41.48 | -90.32 | 830 | |
| Green Rock | city | Illinois | United States | 41.47 | -90.36 | 830 | |
| Green Valley | city | Illinois | United States | 40.41 | -89.64 | 830 | |
| Green View Heights | city | Illinois | United States | 42.23 | -89.06 | 830 | |
| Greenbriar | city | Illinois | United States | 40.52 | -88.95 | 830 | |
| Greenbriar Highlands | city | Illinois | United States | 42.13 | -87.84 | 830 | |
| Greenbush | city | Illinois | United States | 40.71 | -90.54 | 830 | |
| Greendale | city | Illinois | United States | 38.63 | -88.70 | 830 | |
| Greendale | city | Illinois | United States | 42.23 | -89.06 | 830 | |
| Greenfield | city | Illinois | United States | 39.34 | -90.21 | 830 | |
| Greenland (historical) | city | Illinois | United States | 39.18 | -88.82 | 830 | |
| Greenoak | city | Illinois | United States | 41.48 | -89.41 | 830 | |
| Greenpond | city | Illinois | United States | 39.50 | -90.64 | 830 | |
| Greenridge | city | Illinois | United States | 39.42 | -89.79 | 830 | |
| Greenridge Estates | city | Illinois | United States | 42.19 | -89.06 | 830 | |
| Greenup | city | Illinois | United States | 39.25 | -88.16 | 830 | |
| Greenview | city | Illinois | United States | 40.08 | -89.74 | 830 | |
| Greenview Estates | city | Illinois | United States | 42.26 | -88.89 | 830 | |
| Greenville | city | Illinois | United States | 38.89 | -89.41 | 830 | |
| Greenville (historical) | city | Illinois | United States | 37.89 | -88.82 | 830 | |
| Greenwich | city | Illinois | United States | 41.12 | -87.93 | 830 | |
| Greenwood | city | Illinois | United States | 41.61 | -87.59 | 830 | |
| Greenwood | city | Illinois | United States | 42.39 | -88.39 | 849 | |
| Greer | city | Illinois | United States | 40.53 | -87.59 | 830 | |
| Gretna | city | Illinois | United States | 41.90 | -88.10 | 830 | |
| Gridley | city | Illinois | United States | 40.74 | -88.88 | 830 | |
| Griffin | city | Illinois | United States | 41.24 | -90.49 | 830 | |
| Griffin (historical) | city | Illinois | United States | 39.45 | -87.65 | 830 | |
| Griffiths Mobile Home Park | city | Illinois | United States | 42.25 | -90.29 | 830 | |
| Grigg | city | Illinois | United States | 38.19 | -89.91 | 406 | |
| Griggsville | city | Illinois | United States | 39.71 | -90.72 | 830 | |
| Grigsville | city | Illinois | United States | 39.71 | -90.72 | 830 | |
| Grimes Addition | city | Illinois | United States | 41.80 | -89.75 | 830 | |
| Grimsby | city | Illinois | United States | 37.75 | -89.45 | 357 | |
| Grinnell | city | Illinois | United States | 37.28 | -88.87 | 396 | |
| Grisold (historical) | city | Illinois | United States | 38.72 | -87.69 | 830 | |
| Griswold | city | Illinois | United States | 40.91 | -88.35 | 830 | |
| Groat | city | Illinois | United States | 37.97 | -88.87 | 400 | |
| Gross | city | Illinois | United States | 37.53 | -88.29 | 830 | |
| Gross Point | city | Illinois | United States | 42.08 | -87.72 | 830 | |
| Grove | city | Illinois | United States | 40.62 | -89.63 | 830 | |
| Grove City | city | Illinois | United States | 39.71 | -89.30 | 830 | |
| Groveland | city | Illinois | United States | 40.59 | -89.53 | 830 | |
| Grubbs | city | Illinois | United States | 37.93 | -89.36 | 380 | |
| Grumle Corner | city | Illinois | United States | 40.25 | -87.67 | 830 |