| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ulm | city | Arkansas | United States | 34.58 | -91.46 | 196 | |
| Umpire | city | Arkansas | United States | 34.28 | -94.05 | 830 | |
| Unco | city | Arkansas | United States | 33.48 | -92.42 | 183 | |
| Underwood (historical) | city | Arkansas | United States | 35.68 | -91.38 | 232 | |
| Union | city | Arkansas | United States | 36.26 | -91.92 | 830 | |
| Union | city | Arkansas | United States | 34.06 | -94.36 | 396 | |
| Union | city | Arkansas | United States | 33.08 | -92.33 | 98 | |
| Union | city | Arkansas | United States | 35.32 | -93.67 | 830 | |
| Union | city | Arkansas | United States | 35.30 | -91.27 | 213 | |
| Union City | city | Arkansas | United States | 35.49 | -93.55 | 830 | |
| Union Hill | city | Arkansas | United States | 35.53 | -91.51 | 830 | |
| Union Hill | city | Arkansas | United States | 34.93 | -93.78 | 830 | |
| Union Hill | city | Arkansas | United States | 35.06 | -90.82 | 239 | |
| Union Hill | city | Arkansas | United States | 34.52 | -93.85 | 951 | |
| Union Valley | city | Arkansas | United States | 34.76 | -92.00 | 226 | |
| Uniontown | city | Arkansas | United States | 35.58 | -94.44 | 830 | |
| Unionville (historical) | city | Arkansas | United States | 33.98 | -92.20 | 249 | |
| Unity | city | Arkansas | United States | 33.14 | -91.89 | 127 | |
| Unity | city | Arkansas | United States | 33.91 | -93.85 | 364 | |
| Unity | city | Arkansas | United States | 36.10 | -90.48 | 291 | |
| Uno | city | Arkansas | United States | 35.65 | -91.03 | 232 | |
| Upper Nodena (historical) | city | Arkansas | United States | 35.60 | -89.98 | 232 | |
| Upper Poplar Ridge | city | Arkansas | United States | 35.89 | -90.41 | 232 | |
| Urbana | city | Arkansas | United States | 33.16 | -92.45 | 144 | |
| Urbanette | city | Arkansas | United States | 36.42 | -93.53 | 1669 | |
| Ursula | city | Arkansas | United States | 35.32 | -94.09 | 830 | |
| Uzzett (historical) | city | Arkansas | United States | 34.89 | -91.69 | 200 |