| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ulm | city | Arkansas | United States | 34.57583 | -91.46056 | 196 | 2940 |
| Umpire | city | Arkansas | United States | 34.27889 | -94.05056 | 807 | 476 |
| Unco | city | Arkansas | United States | 33.48361 | -92.42111 | 183 | 476 |
| Underwood historical | city | Arkansas | United States | 35.68 | -91.38333 | 232 | 1090 |
| Union | city | Arkansas | United States | 34.06139 | -94.36083 | 396 | 5421 |
| Union | city | Arkansas | United States | 35.32056 | -93.66722 | 459 | 3645 |
| Union | city | Arkansas | United States | 33.07583 | -92.33472 | 98 | 758 |
| Union | city | Arkansas | United States | 36.25972 | -91.92111 | 764 | 839 |
| Union | city | Arkansas | United States | 35.30278 | -91.26806 | 213 | 719 |
| Union City | city | Arkansas | United States | 35.48778 | -93.54778 | 561 | 3229 |
| Union Hill | city | Arkansas | United States | 34.52028 | -93.85472 | 951 | 406 |
| Union Hill | city | Arkansas | United States | 34.93194 | -93.78194 | 597 | 363 |
| Union Hill | city | Arkansas | United States | 35.53417 | -91.51167 | 698 | 829 |
| Union Hill | city | Arkansas | United States | 35.06028 | -90.81611 | 239 | 7796 |
| Union Valley | city | Arkansas | United States | 34.76472 | -92.00333 | 226 | 1336 |
| Uniontown | city | Arkansas | United States | 35.58444 | -94.44389 | 797 | 1347 |
| Unionville historical | city | Arkansas | United States | 33.97583 | -92.19861 | 249 | 742 |
| Unity | city | Arkansas | United States | 33.90778 | -93.84722 | 364 | 4763 |
| Unity | city | Arkansas | United States | 33.13528 | -91.89389 | 127 | 5125 |
| Unity | city | Arkansas | United States | 36.09667 | -90.48333 | 291 | 10929 |
| Uno | city | Arkansas | United States | 35.64861 | -91.0275 | 232 | 473 |
| Upper Nodena historical | city | Arkansas | United States | 35.60417 | -89.98083 | 232 | 1094 |
| Upper Poplar Ridge | city | Arkansas | United States | 35.89167 | -90.40778 | 232 | 1646 |
| Urbana | city | Arkansas | United States | 33.15944 | -92.44583 | 137 | 992 |
| Urbanette | city | Arkansas | United States | 36.41972 | -93.53333 | 1305 | 1936 |
| Ursula | city | Arkansas | United States | 35.32389 | -94.09278 | 439 | 1607 |
| Uzzett historical | city | Arkansas | United States | 34.89028 | -91.69167 | 200 | 971 |
|
|