UpAlphabetical listing of Places in Illinois
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|
| Sibley | city | Illinois | United States | 40.59 | -88.38 | 830 | |
| Sicagum | city | Illinois | United States | 41.85 | -87.65 | 830 | |
| Sicily | city | Illinois | United States | 39.59 | -89.49 | 830 | |
| Sidell | city | Illinois | United States | 39.91 | -87.82 | 830 | |
| Sidney | city | Illinois | United States | 40.03 | -88.07 | 830 | |
| Siemar Subdivision | city | Illinois | United States | 42.10 | -87.85 | 830 | |
| Sigel | city | Illinois | United States | 39.23 | -88.49 | 830 | |
| Signal Hill | city | Illinois | United States | 38.58 | -90.06 | 830 | |
| Sikkemas Trailer Park | city | Illinois | United States | 41.85 | -90.16 | 830 | |
| Silent Meadow | city | Illinois | United States | 42.01 | -88.42 | 898 | |
| Siloam | city | Illinois | United States | 39.89 | -90.92 | 830 | |
| Silver Glen Meadows | city | Illinois | United States | 41.97 | -88.43 | 898 | |
| Silver Hills | city | Illinois | United States | 42.23 | -89.06 | 830 | |
| Silver Lake | city | Illinois | United States | 42.24 | -88.24 | 856 | |
| Silver Lake (historical) | city | Illinois | United States | 40.76 | -91.06 | 830 | |
| Silvis | city | Illinois | United States | 41.51 | -90.42 | 830 | |
| Simons | city | Illinois | United States | 41.91 | -87.71 | 830 | |
| Simpson | city | Illinois | United States | 37.47 | -88.76 | 390 | |
| Sims | city | Illinois | United States | 38.36 | -88.53 | 406 | |
| Sinclair | city | Illinois | United States | 39.80 | -90.12 | 830 | |
| Siseras | city | Illinois | United States | 41.85 | -87.75 | 830 | |
| Six Corners | city | Illinois | United States | 41.95 | -87.75 | 830 | |
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