Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Union School | School | 25 | Morehouse | 32 45 18 N | 091 48 48 W |
| Union School (historical) | School | 73 | East Feliciana | 30 55 59 N | 090 54 15 W |
| Union School (historical) | School | 73 | Sabine | 31 25 17 N | 093 26 26 W |
| Union Spring Baptist Church | Church | 67 | Caddo | 32 27 17 N | 093 45 59 W |
| Union Spring Church | Church | 78 | Sabine | 31 49 58 N | 093 47 27 W |
| Union Springs | Populated Place | 80 | Sabine | 31 49 50 N | 093 47 24 W |
| Union Springs Church | Church | 90 | Webster | 32 53 37 N | 093 20 36 W |
| Union Springs School (historical) | School | 95 | Webster | 32 53 46 N | 093 20 31 W |
| Union State Wildlife Management Area | Park | 62 | Union | 32 55 59 N | 092 19 53 W |
| Union Station | Locale | 1 | Orleans | 29 56 50 N | 090 04 43 W |
| Union Texas Petroleum Heliport | Airport | 4 | Ascension | 30 14 20 N | 091 03 13 W |
| Union Training School (historical) | School | 47 | Tangipahoa | 30 38 54 N | 090 17 08 W |
| Union Valley Church | Church | 24 | Franklin | 32 19 01 N | 091 41 24 W |
| Union Valley Church | Church | 27 | Franklin | 32 23 16 N | 091 32 20 W |
| Union Vine Church | Church | 70 | De Soto | 32 02 33 N | 093 58 19 W |
| Union Wildlife Management Area | Park | 73 | Union | 32 55 54 N | 092 20 17 W |
| Unionville | Populated Place | 70 | Lincoln | 32 40 10 N | 092 38 30 W |
| Unionville Gas Field | Oilfield | 42 | Lincoln | 32 39 22 N | 092 34 26 W |
| Unitarian Church | Church | 15 | East Baton Rouge | 30 26 34 N | 091 05 47 W |
| Unitarian Fellowship of Alexandria | Church | 24 | Rapides | 31 18 30 N | 092 27 13 W |
| United | Populated Place | 2 | St. Mary | 29 46 48 N | 091 44 46 W |
| United Christian Fellowship Church | Church | 3 | Calcasieu | 30 14 31 N | 093 10 27 W |
| United Church | Church | 71 | Bossier | 32 32 04 N | 093 29 09 W |
| United Church | Church | 34 | La Salle | 31 35 45 N | 092 08 37 W |
| United Church | Church | 26 | Rapides | 31 20 53 N | 092 11 40 W |
| United Church | Church | 59 | Rapides | 31 25 03 N | 092 24 03 W |
| United Church | Church | 92 | Sabine | 31 45 60 N | 093 38 43 W |
| United Church | Church | 8 | St. Tammany | 30 29 41 N | 090 03 05 W |
| United Church | Church | 7 | Tangipahoa | 30 26 33 N | 090 27 40 W |
| United Church | Church | 51 | Vernon | 31 05 42 N | 093 29 37 W |
| United Church of Algiers | Church | 1 | Orleans | 29 56 43 N | 090 02 45 W |
| United Medical Center | Hospital | 1 | Orleans | 29 58 02 N | 090 02 20 W |
| United Medical Center of New Orleans | Hospital | 1 | Orleans | 29 58 01 N | 090 02 22 W |
| United Methodist Camp | Locale | 15 | Allen | 30 33 01 N | 092 55 56 W |
| United Methodist Church | Church | 34 | West Feliciana | 30 46 28 N | 091 23 07 W |
| United Pentecostal Church | Church | 12 | Lafayette | 30 14 41 N | 092 00 34 W |
| United Pentecostal Church | Church | 38 | Morehouse | 32 47 17 N | 091 53 55 W |
| United Pentecostal Church | Church | 55 | Ouachita | 32 31 25 N | 092 16 00 W |
| United Pentecostal Church | Church | 23 | Rapides | 31 17 09 N | 092 26 54 W |
| United Pentecostal Church | Church | 111 | Sabine | 31 26 01 N | 093 18 36 W |
| United Pentecostal Church | Church | 11 | St. Landry | 30 44 53 N | 091 51 06 W |
| United Pentecostal Church of Holden | Church | 13 | Livingston | 30 30 20 N | 090 40 14 W |
| United School | School | 0 | Orleans | 29 58 34 N | 090 02 44 W |
| United States Base Hospital Number 27 (historical) | Hospital | 45 | Rapides | 31 21 16 N | 092 26 13 W |
| United States Border Patrol | Building | 0 | Orleans | 29 55 33 N | 090 00 53 W |
| United States Corps of Engineers District Headquarters | Building | 4 | Orleans | 29 56 09 N | 090 08 03 W |
| United States Livestock Experimental Farm | Locale | 5 | Iberia | 29 57 36 N | 091 42 38 W |
| United States Marine Hospital | Hospital | 4 | Orleans | 29 55 01 N | 090 07 29 W |
| United States Sugar Cane Experimental Station | Locale | 3 | Terrebonne | 29 35 04 N | 090 43 45 W |
| Unity Baptist Church | Church | 4 | Calcasieu | 30 14 00 N | 093 12 05 W |
| Unity Church of God in Christ | Church | 17 | Livingston | 30 29 48 N | 090 51 52 W |
| Universal Christian Center | Church | 13 | East Baton Rouge | 30 27 24 N | 091 10 11 W |
| Universal Church | Church | 12 | Ascension | 30 17 57 N | 090 57 22 W |
| Universal Plaza Shopping Center | Locale | 11 | East Baton Rouge | 30 23 58 N | 091 06 20 W |
| University | Locale | 6 | East Baton Rouge | 30 24 22 N | 091 11 09 W |
| University Acres (subdivision) | Populated Place | 11 | East Baton Rouge | 30 23 24 N | 091 09 00 W |
| University Baptist Church | Church | 4 | Calcasieu | 30 10 31 N | 093 13 55 W |
| University Baptist Church | Church | 13 | East Baton Rouge | 30 23 33 N | 091 09 17 W |
| University Baptist Church | Church | 92 | Lincoln | 32 30 38 N | 092 40 21 W |
| University Church of Christ | Church | 50 | Caddo | 32 26 41 N | 093 42 22 W |
| University Church of Christ | Church | 24 | Ouachita | 32 31 27 N | 092 04 38 W |
| University City Baptist Church | Church | -1 | Jefferson | 30 00 51 N | 090 16 08 W |
| University Elementary School | School | 49 | Caddo | 32 24 50 N | 093 42 13 W |
| University Episcopal Chapel | Church | 18 | Tangipahoa | 30 30 33 N | 090 28 13 W |
| University Gardens (subdivision) | Populated Place | 8 | East Baton Rouge | 30 25 16 N | 091 08 57 W |
| University Hills (subdivision) | Populated Place | 12 | East Baton Rouge | 30 24 13 N | 091 09 56 W |
| University Lake | Lake | 6 | East Baton Rouge | 30 24 31 N | 091 09 54 W |
| University Lake Dam | Dam | 6 | East Baton Rouge | 30 24 31 N | 091 09 54 W |
| University Montessori School of Hammond | School | 20 | Tangipahoa | 30 30 31 N | 090 27 53 W |
| University of New Orleans | School | 1 | Orleans | 30 01 41 N | 090 04 01 W |
| University of New Orleans-East Campus | School | 1 | Orleans | 30 01 49 N | 090 02 44 W |
| University of Southwestern Louisiana | School | 11 | Lafayette | 30 12 56 N | 092 01 08 W |
| University Oil Field | Oilfield | 6 | East Baton Rouge | 30 23 38 N | 091 10 15 W |
| University Park (subdivision) | Populated Place | 49 | Caddo | 32 24 54 N | 093 42 23 W |
| University Place | Populated Place | 4 | Calcasieu | 30 10 20 N | 093 13 16 W |
| University Place | Populated Place | 25 | Tangipahoa | 30 31 01 N | 090 28 28 W |
| University Place (subdivision) | Populated Place | 19 | East Baton Rouge | 30 32 11 N | 091 11 52 W |
| University Presbyterian Church | Church | 11 | East Baton Rouge | 30 25 07 N | 091 10 18 W |
| University School (historical) | School | 3 | Jefferson | 29 56 23 N | 090 11 43 W |
| University Shadows | Populated Place | 5 | East Baton Rouge | 30 21 59 N | 091 08 50 W |
| University Shopping Center | Locale | 37 | Natchitoches | 31 45 16 N | 093 05 38 W |
| University Shopping District | Locale | 8 | East Baton Rouge | 30 25 08 N | 091 10 40 W |
| University South (subdivision) | Populated Place | 7 | East Baton Rouge | 30 23 56 N | 091 10 33 W |
| University Spiritual Church | Church | 0 | Orleans | 29 58 13 N | 090 03 45 W |
| University Square Shopping Center | Locale | 10 | Lafayette | 30 12 57 N | 092 02 54 W |
| University Terrace (subdivision) | Populated Place | 7 | East Baton Rouge | 30 25 11 N | 091 11 11 W |
| University Terrace Elementary School | School | 8 | East Baton Rouge | 30 25 17 N | 091 10 57 W |
| University United Methodist Church | Church | 5 | Calcasieu | 30 11 38 N | 093 13 01 W |
| University View (subdivision) | Populated Place | 6 | East Baton Rouge | 30 24 08 N | 091 10 26 W |
| Unknown Pass | Channel | -1 | Orleans | 30 06 52 N | 089 42 14 W |
| Unknown Pass Gas Field | Oilfield | 0 | Orleans | 30 06 11 N | 089 43 58 W |
| Upco | Populated Place | 50 | Union | 32 45 52 N | 092 08 08 W |
| Upland | Populated Place | 46 | Morehouse | 32 43 52 N | 091 52 59 W |
| Upper Ashland Landing | Locale | 17 | Avoyelles | 31 11 02 N | 092 10 15 W |
| Upper Bayou Nezpique Number Seven Dam | Dam | 26 | Evangeline | 30 47 49 N | 092 22 30 W |
| Upper Bayou Nezpique Number Six Dam | Dam | 26 | Evangeline | 30 49 01 N | 092 23 06 W |
| Upper Bayou Nezpique Number Three Dam | Dam | 26 | Evangeline | 30 49 43 N | 092 28 48 W |
| Upper Black Bayou | Gut | 0 | St. Tammany | 30 13 16 N | 089 39 09 W |
| Upper Bosco Landing | Locale | 16 | Ouachita | 32 17 32 N | 092 05 36 W |
| Upper Caney Campground | Locale | 67 | Webster | 32 40 30 N | 093 17 28 W |
| Upper Caney Dam | Dam | 66 | Webster | 32 40 19 N | 093 17 01 W |
| Upper Caney Lake | Reservoir | 66 | Webster | 32 40 19 N | 093 17 01 W |
| Upper Circle Lake | Lake | 12 | Beauregard | 30 34 35 N | 093 43 08 W |
| Upper Clear Lake | Lake | 14 | Concordia | 31 41 45 N | 091 35 12 W |
| Upper Danville Landing | Locale | 12 | Caldwell | 31 55 47 N | 091 56 20 W |
| Upper Eagle Creek | Stream | | Franklin | 32 04 59 N | 091 53 15 W |
| Upper Flat | Lake | 1 | Iberville | 30 15 34 N | 091 28 42 W |
| Upper Grand Bayou | Gut | 0 | Plaquemines | 29 29 29 N | 089 38 11 W |
| Upper Grand River | Stream | | Iberville | 30 13 09 N | 091 19 06 W |
| Upper Grand River School (historical) | School | 3 | Iberville | 30 13 40 N | 091 24 52 W |