| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sabina | city | Illinois | United States | 40.35 | -88.65 | 830 | |
| Sacramento | city | Illinois | United States | 38.03 | -88.34 | 830 | |
| Saddle Brook Run | city | Illinois | United States | 41.63 | -87.96 | 830 | |
| Saddle Creek | city | Illinois | United States | 41.69 | -88.20 | 830 | |
| Saddlewood | city | Illinois | United States | 41.89 | -88.08 | 830 | |
| Sadorus | city | Illinois | United States | 39.97 | -88.35 | 830 | |
| Sag Bridge | city | Illinois | United States | 41.69 | -87.93 | 830 | |
| Saidora | city | Illinois | United States | 40.11 | -90.14 | 830 | |
| Sailor Springs | city | Illinois | United States | 38.76 | -88.36 | 830 | |
| Saint Anne | city | Illinois | United States | 41.03 | -87.71 | 830 | |
| Saint Anne Woods | city | Illinois | United States | 41.04 | -87.63 | 830 | |
| Saint Augustine | city | Illinois | United States | 40.72 | -90.41 | 830 | |
| Saint Charles | city | Illinois | United States | 41.91 | -88.31 | 830 | |
| Saint David | city | Illinois | United States | 40.49 | -90.05 | 830 | |
| Saint Elmo | city | Illinois | United States | 39.03 | -88.85 | 830 | |
| Saint Francisville | city | Illinois | United States | 38.59 | -87.65 | 830 | |
| Saint George | city | Illinois | United States | 41.19 | -87.78 | 830 | |
| Saint Jacob | city | Illinois | United States | 38.71 | -89.77 | 830 | |
| Saint James | city | Illinois | United States | 38.95 | -88.85 | 830 | |
| Saint Joe | city | Illinois | United States | 38.23 | -90.15 | 830 | |
| Saint Johns | city | Illinois | United States | 38.03 | -89.24 | 830 | |
| Saint Joseph | city | Illinois | United States | 40.11 | -88.04 | 830 | |
| Saint Libory | city | Illinois | United States | 38.36 | -89.71 | 830 | |
| Saint Mary | city | Illinois | United States | 40.35 | -90.93 | 830 | |
| Saint Morgan | city | Illinois | United States | 38.66 | -89.69 | 830 | |
| Saint Paul | city | Illinois | United States | 38.85 | -88.95 | 830 | |
| Saint Peter | city | Illinois | United States | 38.87 | -88.85 | 830 | |
| Saint Philip (historical) | city | Illinois | United States | 38.11 | -90.18 | 377 | |
| Saint Rose | city | Illinois | United States | 38.68 | -89.55 | 830 | |
| Saint Stephens Green | city | Illinois | United States | 42.13 | -87.84 | 830 | |
| Saint Thomas | city | Illinois | United States | 38.76 | -90.12 | 416 | |
| Sainte Marie | city | Illinois | United States | 38.93 | -88.02 | 830 | |
| Salceca North | city | Illinois | United States | 42.15 | -87.89 | 830 | |
| Salem | city | Illinois | United States | 42.34 | -89.78 | 951 | |
| Salem | city | Illinois | United States | 38.63 | -88.95 | 830 | |
| Salina | city | Illinois | United States | 42.05 | -88.49 | 987 | |
| Saline | city | Illinois | United States | 37.65 | -88.70 | 400 | |
| Saline City | city | Illinois | United States | 37.82 | -88.44 | 416 | |
| Saline Landing | city | Illinois | United States | 37.57 | -88.13 | 830 | |
| Saline Valley Store (historical) | city | Illinois | United States | 37.67 | -88.50 | 377 | |
| Salisbury | city | Illinois | United States | 39.89 | -89.80 | 830 | |
| Saluda | city | Illinois | United States | 40.87 | -90.39 | 830 | |
| Sammons Point | city | Illinois | United States | 41.03 | -87.86 | 830 | |
| Samoth | city | Illinois | United States | 37.33 | -88.79 | 830 | |
| Samsville | city | Illinois | United States | 38.49 | -88.06 | 830 | |
| Samuel A Rothermel Houses | city | Illinois | United States | 41.89 | -87.80 | 830 | |
| Samuelson Corners | city | Illinois | United States | 42.30 | -89.03 | 830 | |
| San Jose | city | Illinois | United States | 40.31 | -89.60 | 830 | |
| Sand Barrens | city | Illinois | United States | 38.59 | -87.69 | 403 | |
| Sand Ridge | city | Illinois | United States | 41.42 | -88.33 | 830 | |
| Sand Ridge | city | Illinois | United States | 37.74 | -89.44 | 357 | |
| Sandburn | city | Illinois | United States | 37.51 | -88.84 | 830 | |
| Sanders Crossing | city | Illinois | United States | 42.15 | -87.88 | 830 | |
| Sanders Estates | city | Illinois | United States | 42.15 | -87.88 | 830 | |
| Sanders Prairie | city | Illinois | United States | 42.14 | -87.89 | 830 | |
| Sandersville | city | Illinois | United States | 39.61 | -89.16 | 830 | |
| Sandoval | city | Illinois | United States | 38.62 | -89.11 | 830 | |
| Sands | city | Illinois | United States | 41.75 | -89.86 | 830 | |
| Sandusky | city | Illinois | United States | 37.20 | -89.27 | 341 | |
| Sandwich | city | Illinois | United States | 41.65 | -88.62 | 830 | |
| Sanfordville (historical) | city | Illinois | United States | 41.93 | -89.63 | 830 | |
| Sangamon | city | Illinois | United States | 39.87 | -88.86 | 830 | |
| Sankoty | city | Illinois | United States | 40.76 | -89.57 | 830 | |
| Saratoga | city | Illinois | United States | 37.51 | -89.16 | 830 | |
| Saratoga | city | Illinois | United States | 41.46 | -88.43 | 830 | |
| Saratoga Center | city | Illinois | United States | 41.11 | -89.59 | 830 | |
| Sato | city | Illinois | United States | 37.91 | -89.43 | 830 | |
| Sauganash | city | Illinois | United States | 41.99 | -87.74 | 830 | |
| Sauget | city | Illinois | United States | 38.60 | -90.18 | 403 | |
| Sauk Village | city | Illinois | United States | 41.49 | -87.57 | 830 | |
| Saunders | city | Illinois | United States | 39.85 | -89.31 | 830 | |
| Saunemin | city | Illinois | United States | 40.89 | -88.41 | 830 | |
| Savage (historical) | city | Illinois | United States | 39.78 | -90.21 | 830 | |
| Savanna | city | Illinois | United States | 42.09 | -90.16 | 830 | |
| Savoy | city | Illinois | United States | 40.05 | -88.25 | 830 | |
| Sawyerville | city | Illinois | United States | 39.08 | -89.81 | 830 | |
| Saxon (historical) | city | Illinois | United States | 41.15 | -89.89 | 830 | |
| Saxon (historical) | city | Illinois | United States | 40.92 | -88.25 | 830 | |
| Saybrook | city | Illinois | United States | 40.43 | -88.53 | 830 | |
| Sayles Manor | city | Illinois | United States | 41.53 | -88.15 | 830 |