Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Union Grove Church | Church | 160 | Calhoun | 34 06 53 N | 089 28 45 W |
| Union Grove Church | Church | 42 | Carroll | 33 39 19 N | 090 04 46 W |
| Union Grove Church | Church | 73 | Greene | 31 24 38 N | 088 47 41 W |
| Union Grove Church | Church | 141 | Lafayette | 34 15 10 N | 089 28 29 W |
| Union Grove Church | Church | 128 | Lee | 34 19 03 N | 088 33 26 W |
| Union Grove Church | Church | 38 | Leflore | 33 29 22 N | 090 10 55 W |
| Union Grove Church | Church | 34 | Leflore | 33 31 51 N | 090 26 36 W |
| Union Grove Church | Church | 40 | Leflore | 33 44 14 N | 090 22 39 W |
| Union Grove Church | Church | 139 | Lincoln | 31 42 04 N | 090 21 43 W |
| Union Grove Church | Church | 157 | Neshoba | 32 45 53 N | 089 02 02 W |
| Union Grove Church | Church | 136 | Scott | 32 23 32 N | 089 26 57 W |
| Union Grove Church | Church | 134 | Scott | 32 28 03 N | 089 25 22 W |
| Union Grove Church | Church | 141 | Smith | 32 11 17 N | 089 28 48 W |
| Union Grove Church | Church | 35 | Sunflower | 33 25 47 N | 090 31 20 W |
| Union Grove Church | Church | 37 | Sunflower | 33 28 04 N | 090 37 29 W |
| Union Grove Church | Church | 41 | Sunflower | 33 47 15 N | 090 39 26 W |
| Union Grove Church | Church | 35 | Sunflower | 33 33 51 N | 090 31 29 W |
| Union Grove Church | Church | 43 | Tallahatchie | 33 53 00 N | 090 05 26 W |
| Union Grove Church | Church | 171 | Tippah | 34 46 19 N | 088 54 33 W |
| Union Grove Church | Church | 119 | Union | 34 32 36 N | 089 02 11 W |
| Union Grove Church | Church | 137 | Webster | 33 33 14 N | 089 30 06 W |
| Union Grove Church (historical) | Church | 100 | Hinds | 32 06 31 N | 090 20 21 W |
| Union Grove Church (historical) | Church | 50 | Quitman | 34 23 41 N | 090 12 03 W |
| Union Grove Church (historical) | Church | 36 | Sunflower | 33 22 50 N | 090 37 39 W |
| Union Grove Elementary School | School | 32 | Humphreys | 33 15 20 N | 090 38 43 W |
| Union Grove Primitive Baptist Church | Church | 107 | Monroe | 34 04 45 N | 088 31 00 W |
| Union Grove School | School | 119 | Union | 34 32 35 N | 089 02 12 W |
| Union Grove School (historical) | School | 139 | Newton | 32 22 35 N | 089 14 46 W |
| Union Grove United Methodist Church | Church | 93 | Monroe | 34 00 39 N | 088 37 22 W |
| Union Hall | Locale | 140 | Lincoln | 31 34 09 N | 090 24 20 W |
| Union Hall | Populated Place | 133 | Lafayette | 34 13 28 N | 089 32 34 W |
| Union Hall Baptist Church | Church | 144 | Lincoln | 31 34 07 N | 090 24 20 W |
| Union Hall Church | Church | 57 | Kemper | 32 48 31 N | 088 25 02 W |
| Union Hill | Populated Place | 154 | Union | 34 29 11 N | 088 57 07 W |
| Union Hill (historical) | Locale | 167 | Benton | 34 56 27 N | 089 09 32 W |
| Union Hill Cemetery | Cemetery | 142 | Lee | 34 19 51 N | 088 34 17 W |
| Union Hill Cemetery | Cemetery | 179 | Tippah | 34 41 29 N | 089 03 11 W |
| Union Hill Cemetery | Cemetery | 130 | Union | 34 29 02 N | 089 06 51 W |
| Union Hill Cemetery | Cemetery | 136 | Yalobusha | 34 05 39 N | 089 41 30 W |
| Union Hill Church | Church | 174 | Benton | 34 56 29 N | 089 09 30 W |
| Union Hill Church | Church | 45 | Bolivar | 33 57 35 N | 090 47 53 W |
| Union Hill Church | Church | 148 | Clarke | 32 10 45 N | 088 40 44 W |
| Union Hill Church | Church | 85 | DeSoto | 34 46 49 N | 090 11 10 W |
| Union Hill Church | Church | 178 | Kemper | 32 55 13 N | 088 41 12 W |
| Union Hill Church | Church | 134 | Lafayette | 34 30 49 N | 089 27 23 W |
| Union Hill Church | Church | 149 | Lafayette | 34 25 03 N | 089 19 02 W |
| Union Hill Church | Church | 99 | Lee | 34 08 22 N | 088 35 46 W |
| Union Hill Church | Church | 141 | Lee | 34 19 50 N | 088 34 13 W |
| Union Hill Church | Church | 79 | Madison | 32 32 43 N | 090 17 14 W |
| Union Hill Church | Church | 95 | Oktibbeha | 33 26 19 N | 088 54 49 W |
| Union Hill Church | Church | 179 | Tippah | 34 41 25 N | 089 03 11 W |
| Union Hill Church | Church | 115 | Union | 34 29 16 N | 089 06 59 W |
| Union Hill Church | Church | 134 | Yalobusha | 34 05 33 N | 089 41 30 W |
| Union Hill Church (historical) | Church | 72 | Claiborne | 31 56 57 N | 090 53 53 W |
| Union Hopewell Church | Church | 46 | Lowndes | 33 18 10 N | 088 21 24 W |
| Union Landing (historical) | Locale | 36 | Leflore | 33 35 19 N | 090 11 38 W |
| Union Line Cemetery | Cemetery | 119 | Jones | 31 47 21 N | 089 16 10 W |
| Union Line Church | Church | 117 | Jones | 31 47 14 N | 089 15 55 W |
| Union Line School (historical) | School | 117 | Jones | 31 47 16 N | 089 15 56 W |
| Union Mills (historical) | Locale | 147 | Tippah | 34 42 15 N | 088 47 35 W |
| Union Municipal Airport | Airport | 155 | Neshoba | 32 34 50 N | 089 08 10 W |
| Union Paradise Church | Church | 109 | Holmes | 33 05 00 N | 089 58 50 W |
| Union Paradise Church | Church | 110 | Yazoo | 32 51 52 N | 090 07 34 W |
| Union Presbyterian Church | Church | 92 | Monroe | 33 58 49 N | 088 38 00 W |
| Union Primitive Church | Church | 119 | Lincoln | 31 21 43 N | 090 17 26 W |
| Union Ridge Cemetery | Cemetery | 148 | Winston | 32 57 26 N | 089 01 30 W |
| Union Ridge Church | Church | 182 | Itawamba | 34 26 35 N | 088 10 43 W |
| Union Ridge Church | Church | 131 | Leake | 32 34 40 N | 089 30 50 W |
| Union Ridge Church | Church | 128 | Scott | 32 34 34 N | 089 32 13 W |
| Union Ridge Church | Church | 148 | Winston | 32 57 21 N | 089 01 29 W |
| Union Ridge School (historical) | School | 138 | Newton | 32 28 01 N | 089 14 37 W |
| Union School | School | 80 | Holmes | 32 54 07 N | 089 58 23 W |
| Union School | School | 116 | Madison | 32 40 48 N | 089 44 52 W |
| Union School | School | 116 | Panola | 34 28 13 N | 089 49 43 W |
| Union School | School | 17 | Pearl River | 30 30 23 N | 089 42 51 W |
| Union School | School | 111 | Union | 34 28 59 N | 089 05 18 W |
| Union School (historical) | School | 177 | Alcorn | 34 50 46 N | 088 26 34 W |
| Union School (historical) | School | 122 | Amite | 31 15 20 N | 091 00 17 W |
| Union School (historical) | School | 94 | Chickasaw | 33 57 54 N | 088 49 00 W |
| Union School (historical) | School | 148 | Choctaw | 33 26 18 N | 089 20 59 W |
| Union School (historical) | School | 137 | Clarke | 32 10 02 N | 088 39 40 W |
| Union School (historical) | School | 88 | Covington | 31 34 16 N | 089 35 50 W |
| Union School (historical) | School | 90 | Greene | 31 24 17 N | 088 49 00 W |
| Union School (historical) | School | 88 | Jones | 31 28 47 N | 089 11 59 W |
| Union School (historical) | School | 107 | Lee | 34 20 11 N | 088 47 26 W |
| Union School (historical) | School | 56 | Marion | 31 14 10 N | 089 44 02 W |
| Union Seminary Cemetery | Cemetery | 107 | Jasper | 31 51 39 N | 089 07 54 W |
| Union Seminary Church | Church | 116 | Jasper | 31 51 26 N | 089 07 49 W |
| Union Sportsman Club Lake Dam | Dam | 157 | Neshoba | 32 39 18 N | 088 59 48 W |
| Union Staff Church | Church | 62 | Clay | 33 34 39 N | 088 33 29 W |
| Union Star Church | Church | 36 | Sunflower | 33 28 36 N | 090 41 52 W |
| Union Temple | Church | 46 | Bolivar | 34 01 01 N | 090 42 45 W |
| Union Temple (historical) | Church | 40 | Sunflower | 33 41 35 N | 090 37 28 W |
| Union Temple Cemetery | Cemetery | 46 | Bolivar | 34 01 00 N | 090 42 46 W |
| Union United Methodist Church | Church | 152 | Newton | 32 34 22 N | 089 07 05 W |
| Union United Methodist Church | Church | 123 | Rankin | 32 06 24 N | 089 45 01 W |
| Union Valley (historical) | Locale | 108 | Webster | 33 42 42 N | 089 04 10 W |
| Union Valley Church | Church | 133 | Marshall | 34 44 42 N | 089 36 43 W |
| Union Valley School (historical) | School | 133 | Marshall | 34 44 42 N | 089 36 44 W |
| Union View Church | Church | 114 | Itawamba | 34 05 42 N | 088 30 29 W |
| Union View School (historical) | School | 104 | Itawamba | 34 21 16 N | 088 32 16 W |
| Union West Church | Church | 107 | Lafayette | 34 14 59 N | 089 38 59 W |
| Union West School | School | 108 | Lafayette | 34 14 57 N | 089 38 59 W |
| Uniontown (historical) | Populated Place | 58 | Jefferson | 31 45 31 N | 091 10 22 W |
| United Baptist Church | Church | 65 | Adams | 31 35 08 N | 091 20 34 W |
| United Christian Church | Church | 90 | Hinds | 32 17 39 N | 090 12 50 W |
| United Church | Church | 66 | Grenada | 33 43 58 N | 089 47 25 W |
| United Church | Church | 160 | Jasper | 32 00 34 N | 089 00 48 W |
| United Church | Church | 136 | Lafayette | 34 21 40 N | 089 34 59 W |
| United Church | Church | 45 | Marion | 31 01 59 N | 089 48 06 W |