| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Spangler Farms | city | Illinois | United States | 41.60 | -88.21 | 830 | |
| Spaniel Woods | city | Illinois | United States | 41.59 | -87.91 | 830 | |
| Spankey | city | Illinois | United States | 39.19 | -90.55 | 830 | |
| Sparks Hill | city | Illinois | United States | 37.58 | -88.29 | 830 | |
| Sparland | city | Illinois | United States | 41.03 | -89.44 | 830 | |
| Sparta | city | Illinois | United States | 38.12 | -89.70 | 830 | |
| Spaulding | city | Illinois | United States | 42.00 | -88.24 | 830 | |
| Spaulding | city | Illinois | United States | 39.87 | -89.54 | 830 | |
| Spaulding Corners | city | Illinois | United States | 42.37 | -87.88 | 830 | |
| Speer | city | Illinois | United States | 40.99 | -89.65 | 830 | |
| Spencer | city | Illinois | United States | 41.50 | -87.94 | 830 | |
| Spencer | city | Illinois | United States | 39.71 | -91.27 | 830 | |
| Spencer Heights | city | Illinois | United States | 37.13 | -89.19 | 393 | |
| Spillertown | city | Illinois | United States | 37.77 | -88.92 | 830 | |
| Spires | city | Illinois | United States | 40.88 | -88.96 | 830 | |
| Split Rail Farm | city | Illinois | United States | 41.97 | -88.39 | 830 | |
| Sportmans Cove | city | Illinois | United States | 42.13 | -87.86 | 830 | |
| Spring Bay | city | Illinois | United States | 40.82 | -89.52 | 830 | |
| Spring Creek | city | Illinois | United States | 41.58 | -87.92 | 830 | |
| Spring Creek Settlement (historical) | city | Illinois | United States | 40.54 | -90.78 | 830 | |
| Spring Creek Woods | city | Illinois | United States | 41.63 | -87.98 | 830 | |
| Spring Garden | city | Illinois | United States | 38.16 | -88.86 | 830 | |
| Spring Green | city | Illinois | United States | 41.86 | -88.36 | 830 | |
| Spring Grove | city | Illinois | United States | 42.44 | -88.24 | 830 | |
| Spring Grove (historical) | city | Illinois | United States | 41.00 | -90.63 | 830 | |
| Spring Hill | city | Illinois | United States | 41.61 | -90.05 | 830 | |
| Spring Lake Mobile Home Park | city | Illinois | United States | 42.00 | -88.23 | 830 | |
| Spring Lake Woods | city | Illinois | United States | 41.62 | -87.92 | 830 | |
| Spring Valley | city | Illinois | United States | 41.33 | -89.20 | 830 | |
| Spring Valley | city | Illinois | United States | 41.90 | -90.04 | 830 | |
| Spring Valley | city | Illinois | United States | 39.90 | -90.98 | 830 | |
| Spring View West | city | Illinois | United States | 41.54 | -87.99 | 830 | |
| Springbrook At Farmington Lakes | city | Illinois | United States | 41.71 | -88.31 | 830 | |
| Springer Station | city | Illinois | United States | 38.18 | -88.35 | 380 | |
| Springerton | city | Illinois | United States | 38.18 | -88.35 | 400 | |
| Springfield | city | Illinois | United States | 39.80 | -89.64 | 830 | |
| Springfildas | city | Illinois | United States | 39.80 | -89.64 | 830 | |
| Springfilds | city | Illinois | United States | 39.80 | -89.64 | 830 | |
| Springfīlda | city | Illinois | United States | 39.80 | -89.64 | 830 | |
| Springville | city | Illinois | United States | 37.37 | -89.27 | 400 | |
| Springwood | city | Illinois | United States | 41.51 | -88.17 | 830 | |
| Springwood South | city | Illinois | United States | 41.51 | -88.16 | 830 | |
| Sprinqfild | city | Illinois | United States | 39.80 | -89.64 | 830 |