| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Stadler Ridge Estates | city | Illinois | United States | 41.62 | -87.98 | 830 | |
| Stagecoach Hills | city | Illinois | United States | 42.42 | -88.98 | 830 | |
| Stagecoach Junction | city | Illinois | United States | 39.22 | -89.61 | 830 | |
| Staley | city | Illinois | United States | 40.11 | -88.31 | 830 | |
| Stallings | city | Illinois | United States | 38.72 | -90.06 | 416 | |
| Standard | city | Illinois | United States | 41.26 | -89.18 | 830 | |
| Standard City | city | Illinois | United States | 39.35 | -89.79 | 830 | |
| Stanford | city | Illinois | United States | 40.43 | -89.22 | 830 | |
| Staples Corner | city | Illinois | United States | 42.14 | -88.02 | 830 | |
| Star City | city | Illinois | United States | 39.13 | -90.67 | 830 | |
| Star Subdivision | city | Illinois | United States | 42.13 | -87.85 | 830 | |
| Stark | city | Illinois | United States | 41.00 | -89.74 | 830 | |
| Starks | city | Illinois | United States | 42.09 | -88.46 | 938 | |
| Starne | city | Illinois | United States | 39.82 | -89.61 | 830 | |
| State Park Place | city | Illinois | United States | 38.66 | -90.05 | 830 | |
| State Road | city | Illinois | United States | 40.08 | -87.96 | 830 | |
| Stately Acres | city | Illinois | United States | 41.63 | -87.99 | 830 | |
| Stately Oaks | city | Illinois | United States | 41.62 | -88.00 | 830 | |
| Stateway Gardens (historical) | city | Illinois | United States | 41.83 | -87.63 | 830 | |
| Staunton | city | Illinois | United States | 39.01 | -89.79 | 830 | |
| Stavanger | city | Illinois | United States | 41.40 | -88.61 | 830 | |
| Steel City | city | Illinois | United States | 38.00 | -88.88 | 403 | |
| Steele | city | Illinois | United States | 41.51 | -87.96 | 830 | |
| Steeleville | city | Illinois | United States | 38.01 | -89.66 | 400 | |
| Steelton | city | Illinois | United States | 40.01 | -87.68 | 830 | |
| Steeplechase At Churchill Club | city | Illinois | United States | 41.70 | -88.30 | 830 | |
| Steger | city | Illinois | United States | 41.47 | -87.64 | 830 | |
| Stelle | city | Illinois | United States | 40.95 | -88.15 | 830 | |
| Stephenson Mobile Home Estates | city | Illinois | United States | 42.30 | -89.75 | 948 | |
| Sterling | city | Illinois | United States | 41.79 | -89.70 | 830 | |
| Sterling Place | city | Illinois | United States | 38.63 | -90.04 | 830 | |
| Steward | city | Illinois | United States | 41.85 | -89.02 | 830 | |
| Stewardson | city | Illinois | United States | 39.26 | -88.63 | 830 | |
| Stewardsville (historical) | city | Illinois | United States | 40.31 | -90.58 | 830 | |
| Stewart Ridge | city | Illinois | United States | 41.67 | -87.63 | 830 | |
| Stickney | city | Illinois | United States | 41.82 | -87.78 | 830 | |
| Still Meadows | city | Illinois | United States | 41.89 | -88.45 | 830 | |
| Stillman Valley | city | Illinois | United States | 42.11 | -89.18 | 830 | |
| Stillwater | city | Illinois | United States | 41.72 | -88.19 | 830 | |
| Stillwell | city | Illinois | United States | 40.22 | -91.18 | 830 | |
| Stiritz | city | Illinois | United States | 37.84 | -88.95 | 406 | |
| Stockdale | city | Illinois | United States | 41.35 | -88.49 | 830 | |
| Stockland | city | Illinois | United States | 40.61 | -87.59 | 830 | |
| Stockton | city | Illinois | United States | 42.35 | -90.01 | 1046 | |
| Stoehrs | city | Illinois | United States | 40.52 | -89.69 | 830 | |
| Stokes | city | Illinois | United States | 38.02 | -88.27 | 400 | |
| Stolle | city | Illinois | United States | 38.54 | -90.17 | 830 | |
| Stolletown | city | Illinois | United States | 38.69 | -89.45 | 830 | |
| Stone Church | city | Illinois | United States | 38.35 | -89.63 | 830 | |
| Stone Fort | city | Illinois | United States | 37.62 | -89.20 | 830 | |
| Stone Hedge | city | Illinois | United States | 42.11 | -87.84 | 830 | |
| Stone Hedge Manor | city | Illinois | United States | 42.11 | -87.85 | 830 | |
| Stone Park | city | Illinois | United States | 41.91 | -87.88 | 830 | |
| Stonebrook | city | Illinois | United States | 42.11 | -87.86 | 830 | |
| Stonebrook East | city | Illinois | United States | 42.11 | -87.85 | 830 | |
| Stonefort | city | Illinois | United States | 37.61 | -88.71 | 400 | |
| Stonegate | city | Illinois | United States | 42.11 | -87.86 | 830 | |
| Stonegate | city | Illinois | United States | 41.54 | -88.13 | 830 | |
| Stonegate | city | Illinois | United States | 41.70 | -88.03 | 830 | |
| Stonehedge Glen | city | Illinois | United States | 42.12 | -87.84 | 830 | |
| Stoneyville | city | Illinois | United States | 41.30 | -88.84 | 830 | |
| Stonington | city | Illinois | United States | 39.64 | -89.19 | 830 | |
| Stony Island | city | Illinois | United States | 41.72 | -87.58 | 830 | |
| Stony Island Heights | city | Illinois | United States | 41.73 | -87.58 | 830 | |
| Stoy | city | Illinois | United States | 39.00 | -87.83 | 830 | |
| Strasburg | city | Illinois | United States | 39.35 | -88.62 | 830 | |
| Stratford | city | Illinois | United States | 42.00 | -89.49 | 830 | |
| Stratton | city | Illinois | United States | 38.45 | -88.71 | 830 | |
| Straut | city | Illinois | United States | 39.44 | -90.71 | 830 | |
| Strawn | city | Illinois | United States | 40.65 | -88.40 | 830 | |
| Strawns Crossing | city | Illinois | United States | 39.79 | -90.15 | 830 | |
| Streadle | city | Illinois | United States | 39.85 | -89.61 | 830 | |
| Streamwood | city | Illinois | United States | 42.03 | -88.18 | 830 | |
| Streator | city | Illinois | United States | 41.12 | -88.84 | 830 | |
| Streeterville | city | Illinois | United States | 41.89 | -87.62 | 830 | |
| Stringtown | city | Illinois | United States | 38.83 | -87.98 | 830 | |
| Stronghurst | city | Illinois | United States | 40.75 | -90.90 | 830 | |
| Stubblefield | city | Illinois | United States | 38.85 | -89.47 | 830 | |
| Sturbridge Village | city | Illinois | United States | 42.35 | -89.07 | 830 | |
| Sturm Subdivision | city | Illinois | United States | 42.17 | -88.07 | 830 |