Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| U 32 Water Well | Well | 1156 | Dona Ana | 31 48 36 N | 106 35 25 W |
| U 35 Water Well | Well | 1153 | Dona Ana | 31 48 28 N | 106 35 24 W |
| U 38 Water Well | Well | 1144 | Dona Ana | 31 48 29 N | 106 35 18 W |
| U 42 Water Well | Well | 1135 | Dona Ana | 31 48 21 N | 106 35 04 W |
| U 48 Water Well | Well | 1147 | Dona Ana | 31 48 13 N | 106 35 10 W |
| U 53 Water Well | Well | 1134 | Dona Ana | 31 47 59 N | 106 33 55 W |
| U 66 Water Well | Well | 1139 | Dona Ana | 31 48 14 N | 106 34 40 W |
| U 68 Water Well | Well | 1142 | Dona Ana | 31 48 12 N | 106 35 04 W |
| U Bar Ranch | Locale | 1336 | Lea | 33 31 26 N | 103 40 28 W |
| U Bar Ridge | Ridge | 1724 | Hidalgo | 31 33 56 N | 108 23 57 W |
| U Bar Wells | Well | 1343 | Hidalgo | 31 34 33 N | 108 28 54 W |
| U C | Mine | 2208 | Santa Fe | 35 14 32 N | 106 10 16 W |
| U Mine | Mine | 2307 | McKinley | 35 33 28 N | 108 31 53 W |
| U S Hill | Summit | 2609 | Taos | 36 12 42 N | 105 35 35 W |
| U-Butte | Summit | 1950 | Socorro | 34 17 56 N | 106 29 11 W |
| U.S. Mining-Olsen Mine | Mine | 2003 | McKinley | 35 29 11 N | 108 47 12 W |
| U.S. Perlite Mine | Mine | 2528 | Taos | 36 44 48 N | 105 56 11 W |
| U.S. Treasury | Mine | 2153 | Sierra | 33 19 38 N | 107 42 53 W |
| UDC-1 | Mine | 2165 | Cibola | 35 17 31 N | 107 47 07 W |
| UDC-5 | Mine | 2159 | Cibola | 35 17 38 N | 107 47 13 W |
| Uhl Draw | Valley | | Hidalgo | 32 11 59 N | 108 34 22 W |
| Uhl Tank | Reservoir | 1400 | Hidalgo | 32 09 38 N | 108 39 17 W |
| Uhl Well | Well | 1429 | Hidalgo | 32 08 55 N | 108 39 58 W |
| Ulibarri Canyon | Valley | | Rio Arriba | 36 51 22 N | 107 16 04 W |
| Ulibarri Canyon | Valley | | San Juan | 36 57 28 N | 107 30 05 W |
| Ulibarri Place | Populated Place | 1974 | San Juan | 36 57 25 N | 107 31 29 W |
| Ulmoris | Populated Place | 1283 | Hidalgo | 32 19 44 N | 108 37 56 W |
| Ultimo Water Storage Tank | Reservoir | 1811 | Otero | 32 16 13 N | 104 53 10 W |
| Umbarger 1 Water Well | Well | 1991 | Torrance | 34 57 05 N | 105 26 44 W |
| Umbrella Butte | Summit | 1946 | McKinley | 35 41 53 N | 108 45 29 W |
| Umbrella Mesa | Summit | 2193 | Union | 36 53 50 N | 103 56 51 W |
| Umbrella Rock | Summit | 2192 | McKinley | 35 26 13 N | 108 41 49 W |
| UN 1 Lot 1 Water Well | Well | 1544 | Valencia | 34 34 43 N | 106 39 34 W |
| Un Pino Windmill | Locale | 2334 | Catron | 34 00 35 N | 108 39 43 W |
| Uņa de Gato | Locale | 1783 | Sandoval | 35 18 10 N | 106 18 53 W |
| Una de Gato Creek | Stream | | Colfax | 36 46 19 N | 104 23 46 W |
| Una Vida (historical) | Locale | 1890 | San Juan | 36 02 00 N | 107 54 44 W |
| Uncle Jimmy Thwaits Mine | Mine | 2106 | Grant | 32 32 55 N | 108 27 44 W |
| Uncle Joe Number Two | Mine | 2278 | Sandoval | 35 45 32 N | 106 28 06 W |
| Uncle John Mine | Mine | 2347 | Catron | 33 15 00 N | 108 42 02 W |
| Uncle Lewis Well | Well | 1888 | Sierra | 32 48 08 N | 107 40 44 W |
| Uncle Sam Mine | Mine | 1731 | Grant | 32 31 32 N | 108 18 45 W |
| Uncle Sam Well | Well | 2105 | Catron | 33 31 31 N | 107 43 47 W |
| Under the Hill Tank | Reservoir | 1125 | Lea | 32 24 53 N | 103 41 37 W |
| Under the Mesa Well | Well | 2330 | Catron | 34 24 19 N | 108 09 34 W |
| Undertaker Tank | Reservoir | 2052 | Catron | 33 21 45 N | 108 05 55 W |
| Underwood Lake | Lake | 2657 | Catron | 33 55 45 N | 108 59 23 W |
| Underwood Lakes | Reservoir | 3043 | Colfax | 36 57 29 N | 105 12 39 W |
| Underwood Spring Number One | Spring | 2635 | Catron | 33 57 09 N | 109 01 46 W |
| Underwood Spring Number Two | Spring | 2602 | Catron | 33 56 29 N | 109 02 01 W |
| Union | Mine | 2369 | Sandoval | 35 44 44 N | 106 27 45 W |
| Union Community Church Historic Site | Church | 1601 | Sierra | 32 55 15 N | 107 34 01 W |
| Union County | Civil | 1683 | Union | 36 27 00 N | 103 28 02 W |
| Union County Courthouse Historic Site | Building | 1541 | Union | 36 27 06 N | 103 11 03 W |
| Union County General Hospital | Hospital | 1541 | Union | 36 27 06 N | 103 11 03 W |
| Union County General Hospital Medical Library | Building | 1541 | Union | 36 27 06 N | 103 11 03 W |
| Union Elementary School | School | 1958 | San Miguel | 35 35 38 N | 105 13 02 W |
| Union Hill | Populated Place | 1993 | Grant | 32 50 04 N | 108 04 44 W |
| Union Hill | Summit | 2073 | Grant | 32 50 11 N | 108 05 06 W |
| Union Hill Mine | Mine | 2074 | Grant | 32 50 04 N | 108 05 02 W |
| Union Hill Portal | Tunnel | 1993 | Grant | 32 50 03 N | 108 04 50 W |
| Union Jack Mine | Mine | 2251 | Lincoln | 33 32 25 N | 105 49 10 W |
| Union Lode | Mine | 2765 | Rio Arriba | 36 42 41 N | 106 08 48 W |
| Union Mine | Mine | 1841 | Santa Fe | 35 24 52 N | 106 09 08 W |
| Unitarian Church | Church | 2175 | Los Alamos | 35 52 47 N | 106 16 09 W |
| Unitarian Church | Church | 2198 | Los Alamos | 35 53 17 N | 106 18 25 W |
| Unitarian Fellowship Church | Church | 1323 | Otero | 32 53 58 N | 105 57 37 W |
| Unitarian Universalist Church | Church | 1090 | Chaves | 33 23 39 N | 104 31 23 W |
| Unitarian Universalist Church | Church | 1191 | Dona Ana | 32 18 44 N | 106 46 42 W |
| Unitarian Universalist Church | Church | 1323 | Otero | 32 53 58 N | 105 57 37 W |
| Unite State Potash Reserve | Reserve | 1004 | Eddy | 32 32 22 N | 104 03 05 W |
| United Brethren Church | Church | 1707 | Rio Arriba | 35 59 25 N | 106 04 57 W |
| United Church | Church | 2175 | Los Alamos | 35 52 47 N | 106 16 09 W |
| United Church | Church | 1323 | Luna | 32 16 07 N | 107 45 29 W |
| United Church of Los Alamos | Church | 2198 | Los Alamos | 35 53 17 N | 106 18 25 W |
| United Emanuel Church | Church | 2349 | Taos | 36 10 04 N | 105 41 04 W |
| United Methodist Church Parish | Church | 1935 | Lincoln | 33 32 43 N | 105 34 20 W |
| United Mine | Mine | 2321 | Taos | 36 42 39 N | 105 45 25 W |
| United Nuclear Homestakes Partners Dam | Dam | 35 | Valencia | 35 14 30 N | 107 51 48 W |
| United Nuclear-Homestake Mill | Mine | 35 | Cibola | 35 14 26 N | 107 51 18 W |
| United Pentacostal Church | Church | 1705 | Rio Arriba | 35 59 28 N | 106 04 50 W |
| United Pentacostal Church | Church | 1294 | Sierra | 33 07 42 N | 107 15 10 W |
| United Pentecostal Church | Church | 1619 | Bernalillo | 35 03 45 N | 106 34 37 W |
| United Pentecostal Church | Church | 1191 | Dona Ana | 32 18 44 N | 106 46 42 W |
| United Pentecostal Church | Church | 1030 | Eddy | 32 50 32 N | 104 24 12 W |
| United Pentecostal Church | Church | 1192 | Lea | 32 56 38 N | 103 20 55 W |
| United Pentecostal Church | Church | 1323 | Luna | 32 16 07 N | 107 45 29 W |
| United Pentecostal Church | Church | 1985 | McKinley | 35 31 41 N | 108 44 33 W |
| United Pentecostal Church | Church | 1247 | Quay | 35 10 18 N | 103 43 30 W |
| United Pentecostal Church | Church | 1705 | Rio Arriba | 35 59 28 N | 106 04 50 W |
| United Pentecostal Church | Church | 1221 | Roosevelt | 34 11 10 N | 103 20 04 W |
| United Pentecostal New Life Church | Church | 1191 | Dona Ana | 32 18 44 N | 106 46 42 W |
| United Perlite | Mine | 2553 | Taos | 36 46 00 N | 105 57 02 W |
| United Perlite Mine | Mine | 2683 | Taos | 36 43 12 N | 105 55 12 W |
| United States Adit | Mine | 1970 | Grant | 32 49 22 N | 108 05 30 W |
| United States Air Force 14 Water Well | Well | 1602 | Bernalillo | 35 02 03 N | 106 35 46 W |
| United States Air Force Hospital Library | Building | 1301 | Curry | 34 24 17 N | 103 12 19 W |
| United States Air Force Hospital Library | Building | 1241 | Otero | 32 50 21 N | 106 04 57 W |
| United States and Illinois | Mine | 2059 | Sierra | 32 55 02 N | 107 43 26 W |
| United States Army Corps of Engineers Albuquerque District Library | Building | 1511 | Bernalillo | 35 05 04 N | 106 39 04 W |
| United States Bureau of Land Management Library | Building | 1511 | Bernalillo | 35 05 04 N | 106 39 04 W |
| United States Bureau of Reclamation 1 Water Well | Well | 1253 | Dona Ana | 32 46 14 N | 107 16 50 W |
| United States Bureau of Reclamation 10 Water Well | Well | 1260 | Sierra | 32 49 17 N | 107 18 34 W |
| United States Bureau of Reclamation 18 Water Well | Well | 1192 | Dona Ana | 32 20 40 N | 106 48 55 W |
| United States Bureau of Reclamation 2 Water Well | Well | 1498 | Bernalillo | 34 58 06 N | 106 42 32 W |
| United States Bureau of Reclamation 2 Water Well | Well | 1244 | Dona Ana | 32 42 26 N | 107 13 45 W |
| United States Bureau of Reclamation 3 Water Well | Well | 1237 | Dona Ana | 32 39 56 N | 107 09 11 W |
| United States Bureau of Reclamation 4 Water Well | Well | 1231 | Dona Ana | 32 39 51 N | 107 04 35 W |
| United States Bureau of Reclamation 41 Water Well | Well | 1205 | Dona Ana | 32 28 41 N | 106 55 18 W |
| United States Bureau of Reclamation 42 Water Well | Well | 1205 | Dona Ana | 32 28 16 N | 106 53 34 W |