| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Uchisa | city | San Martin | Peru | -8.46 | -76.46 | 2017 | 4003 |
| Uchiza | city | San Martin | Peru | -8.46 | -76.46 | 2017 | 4003 |
| Uchumullaca | city | San Martin | Peru | -6.58 | -76.50 | 1669 | 3840 |
| Ucrania | city | San Martin | Peru | -5.94 | -77.28 | 2687 | 7537 |
| Ucsha | city | San Martin | Peru | -6.51 | -76.31 | 1870 | 6035 |
| Ucururca | city | San Martin | Peru | -6.62 | -76.68 | 2509 | 7798 |
| Ugarte | city | San Martin | Peru | -6.65 | -76.29 | 1138 | 1505 |
| Ugarte California | city | San Martin | Peru | -6.65 | -76.29 | 1138 | 1505 |
| Ullilen | city | San Martin | Peru | -6.84 | -77.69 | 7791 | 154 |
| Ullpayacu | city | San Martin | Peru | -6.54 | -76.34 | 1141 | 52579 |
| Ullpayacu | city | San Martin | Peru | -6.58 | -76.66 | 2559 | 6363 |
| Ulman | city | San Martin | Peru | -6.70 | -76.69 | 1669 | 3230 |
| Urbanizacion La Encantada | city | San Martin | Peru | -12.20 | -77.01 | 78 | 539671 |
| Urito | city | San Martin | Peru | -7.06 | -76.72 | 1102 | 5215 |
| Urquía | city | San Martin | Peru | -8.24 | -76.12 | 2604 | 149 |
| Utcubamba | city | San Martin | Peru | -8.22 | -77.13 | 10068 | 0 |
| Utcurarca | city | San Martin | Peru | -6.66 | -76.28 | 1089 | 1731 |