| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sidney | city | Arkansas | United States | 36.00 | -91.66 | 830 | |
| Sidon | city | Arkansas | United States | 35.34 | -91.94 | 830 | |
| Siedenstricker | city | Arkansas | United States | 34.73 | -91.55 | 209 | |
| Silent Grove | city | Arkansas | United States | 36.22 | -94.16 | 1669 | |
| Silex | city | Arkansas | United States | 35.50 | -93.22 | 830 | |
| Sills | city | Arkansas | United States | 35.28 | -93.28 | 830 | |
| Siloam Springs | city | Arkansas | United States | 36.19 | -94.54 | 1105 | |
| Silt (historical) | city | Arkansas | United States | 34.07 | -91.67 | 173 | |
| Silver | city | Arkansas | United States | 34.53 | -93.51 | 830 | |
| Silver Creek | city | Arkansas | United States | 34.81 | -92.22 | 288 | |
| Silver Hill | city | Arkansas | United States | 35.97 | -92.75 | 898 | |
| Silver Springs (historical) | city | Arkansas | United States | 36.28 | -94.06 | 1131 | |
| Simco (historical) | city | Arkansas | United States | 35.92 | -91.38 | 396 | |
| Simmons | city | Arkansas | United States | 35.81 | -91.72 | 383 | |
| Simmons (historical) | city | Arkansas | United States | 35.34 | -91.23 | 196 | |
| Simpson | city | Arkansas | United States | 33.46 | -92.10 | 203 | |
| Simpson | city | Arkansas | United States | 35.61 | -93.07 | 1797 | |
| Sims | city | Arkansas | United States | 34.66 | -93.69 | 830 | |
| Sims (historical) | city | Arkansas | United States | 35.50 | -90.24 | 229 | |
| Simsboro | city | Arkansas | United States | 35.03 | -90.37 | 203 | |
| Sisemore | city | Arkansas | United States | 34.78 | -91.85 | 239 | |
| Sitka | city | Arkansas | United States | 36.19 | -91.42 | 830 | |
| Sixteenth Section | city | Arkansas | United States | 33.66 | -91.61 | 177 |