Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Union Church | Church | 113 | Hempstead | 33 36 37 N | 093 37 40 W |
| Union Church | Church | 97 | Independence | 35 52 48 N | 091 18 50 W |
| Union Church | Church | 58 | Jefferson | 34 11 44 N | 091 43 49 W |
| Union Church | Church | 68 | Lee | 34 52 33 N | 090 44 36 W |
| Union Church | Church | 135 | Logan | 35 19 24 N | 093 39 52 W |
| Union Church | Church | 54 | Montgomery | 34 36 54 N | 091 04 10 W |
| Union Church | Church | 261 | Montgomery | 34 35 09 N | 093 54 35 W |
| Union Church | Church | 131 | Nevada | 33 34 42 N | 093 22 24 W |
| Union Church | Church | 64 | Ouachita | 33 47 30 N | 092 54 14 W |
| Union Church | Church | 281 | Polk | 34 28 00 N | 094 20 38 W |
| Union Church | Church | 361 | Searcy | 36 05 36 N | 092 54 40 W |
| Union Church | Church | 135 | Sebastian | 35 22 53 N | 094 06 01 W |
| Union Church | Church | 140 | Sevier | 34 03 51 N | 094 20 56 W |
| Union Church | Church | 67 | Union | 33 19 59 N | 092 55 56 W |
| Union Church | Church | 53 | Union | 33 14 15 N | 092 31 56 W |
| Union Church (historical) | Church | 173 | Clark | 34 14 56 N | 093 17 23 W |
| Union Church (historical) | Church | 109 | Columbia | 33 14 52 N | 093 11 26 W |
| Union Church (historical) | Church | 307 | Howard | 34 20 18 N | 094 05 47 W |
| Union Church (historical) | Church | 121 | Pope | 35 13 32 N | 092 59 23 W |
| Union Church (historical) | Church | 61 | Woodruff | 35 03 37 N | 091 11 14 W |
| Union City | Populated Place | 160 | Johnson | 35 29 16 N | 093 32 53 W |
| Union City Gas Field | Oilfield | 163 | Johnson | 35 28 00 N | 093 34 16 W |
| Union County | Civil | 58 | Union | 33 09 00 N | 092 39 01 W |
| Union County Courthouse | Building | 85 | Union | 33 12 43 N | 092 39 48 W |
| Union Elementary School | School | 107 | Miller | 33 22 19 N | 094 00 05 W |
| Union Elementary School | School | 61 | Union | 33 13 58 N | 092 32 23 W |
| Union Grove Cemetery | Cemetery | 104 | Craighead | 35 54 04 N | 090 44 25 W |
| Union Grove Cemetery | Cemetery | 67 | Cross | 35 17 43 N | 090 56 41 W |
| Union Grove Cemetery | Cemetery | 110 | Greene | 36 06 04 N | 090 37 00 W |
| Union Grove Cemetery | Cemetery | 194 | Independence | 35 32 26 N | 091 41 21 W |
| Union Grove Cemetery | Cemetery | 624 | Newton | 35 51 57 N | 093 18 06 W |
| Union Grove Church | Church | 48 | Calhoun | 33 27 01 N | 092 22 16 W |
| Union Grove Church | Church | 64 | Clark | 33 54 12 N | 092 58 10 W |
| Union Grove Church | Church | 74 | Cleveland | 33 59 15 N | 092 07 07 W |
| Union Grove Church | Church | 104 | Craighead | 35 54 03 N | 090 44 20 W |
| Union Grove Church | Church | 75 | Craighead | 35 46 38 N | 090 39 43 W |
| Union Grove Church | Church | 69 | Crittenden | 35 22 41 N | 090 11 42 W |
| Union Grove Church | Church | 137 | Hempstead | 33 50 46 N | 093 32 05 W |
| Union Grove Church | Church | 149 | Johnson | 35 28 38 N | 093 33 53 W |
| Union Grove Church | Church | 50 | Lincoln | 33 58 11 N | 091 32 57 W |
| Union Grove Church | Church | 93 | Nevada | 33 44 00 N | 093 07 10 W |
| Union Grove Church | Church | 331 | Polk | 34 39 04 N | 094 09 26 W |
| Union Grove Church | Church | 97 | Pope | 35 15 10 N | 092 53 27 W |
| Union Grove Church | Church | 64 | St. Francis | 34 54 49 N | 090 56 36 W |
| Union Grove Church (historical) | Church | 81 | Clay | 36 16 00 N | 090 13 47 W |
| Union Grove Church (historical) | Church | 113 | Greene | 36 13 49 N | 090 25 38 W |
| Union Grove Church (historical) | Church | 100 | Greene | 36 05 57 N | 090 36 54 W |
| Union Grove Church (historical) | Church | 57 | Jefferson | 34 20 42 N | 091 44 23 W |
| Union Grove Church (historical) | Church | 77 | Mississippi | 35 57 32 N | 089 47 14 W |
| Union Grove Community Center | Locale | 36 | Ouachita | 33 39 40 N | 092 48 29 W |
| Union Grove School | Locale | 67 | Lonoke | 34 51 51 N | 091 48 16 W |
| Union Grove School (historical) | School | 81 | Clay | 36 16 26 N | 090 13 44 W |
| Union Grove School (historical) | School | 114 | Craighead | 35 54 31 N | 090 44 48 W |
| Union Grove School (historical) | School | 145 | Faulkner | 35 16 25 N | 092 15 21 W |
| Union Grove School (historical) | School | 118 | Nevada | 33 26 52 N | 093 14 22 W |
| Union Grove School (historical) | School | 136 | Yell | 35 01 22 N | 093 16 56 W |
| Union Grove United Methodist Church | Church | 145 | Faulkner | 35 16 24 N | 092 15 21 W |
| Union Hall Church | Church | 185 | Logan | 35 09 29 N | 093 52 38 W |
| Union Heights Church of Christ | Church | 58 | Union | 33 14 38 N | 092 39 42 W |
| Union High School | School | 61 | Union | 33 14 01 N | 092 32 25 W |
| Union Hill | Populated Place | 213 | Independence | 35 32 03 N | 091 30 42 W |
| Union Hill | Populated Place | 299 | Montgomery | 34 31 13 N | 093 51 18 W |
| Union Hill | Populated Place | 176 | Scott | 34 55 55 N | 093 46 56 W |
| Union Hill | Populated Place | 74 | St. Francis | 35 03 37 N | 090 48 58 W |
| Union Hill Cemetery | Cemetery | 49 | Bradley | 33 23 28 N | 092 07 47 W |
| Union Hill Cemetery | Cemetery | 80 | Lafayette | 33 10 16 N | 093 40 50 W |
| Union Hill Cemetery | Cemetery | 285 | Newton | 35 58 32 N | 093 13 20 W |
| Union Hill Cemetery | Cemetery | 64 | St. Francis | 34 54 52 N | 090 55 27 W |
| Union Hill Cemetery | Cemetery | 563 | Van Buren | 35 43 07 N | 092 48 35 W |
| Union Hill Church | Church | 49 | Bradley | 33 23 26 N | 092 07 49 W |
| Union Hill Church | Church | 73 | Cleveland | 33 58 57 N | 092 10 37 W |
| Union Hill Church | Church | 93 | Conway | 35 07 43 N | 092 43 25 W |
| Union Hill Church | Church | 219 | Fulton | 36 25 12 N | 091 28 28 W |
| Union Hill Church | Church | 80 | Lafayette | 33 11 05 N | 093 41 07 W |
| Union Hill Church | Church | 226 | Montgomery | 34 41 06 N | 093 28 35 W |
| Union Hill Church | Church | 561 | Pope | 35 43 04 N | 092 48 36 W |
| Union Hill Church | Church | 612 | Pope | 35 42 55 N | 092 49 24 W |
| Union Hill Church | Church | 184 | Scott | 34 55 41 N | 093 47 29 W |
| Union Hill Church | Church | 62 | St. Francis | 34 54 53 N | 090 55 24 W |
| Union Hill Church | Church | 84 | Union | 33 14 08 N | 092 57 25 W |
| Union Hill Church | Church | 110 | White | 35 10 32 N | 092 06 39 W |
| Union Hill Church (historical) | Church | 71 | Mississippi | 35 28 00 N | 090 01 48 W |
| Union Hill School | School | 288 | Newton | 35 58 36 N | 093 13 22 W |
| Union Hill School | School | 612 | Pope | 35 42 56 N | 092 49 24 W |
| Union Hill School (historical) | School | 127 | Greene | 36 11 05 N | 090 30 42 W |
| Union Hill School (historical) | School | 300 | Montgomery | 34 31 09 N | 093 51 16 W |
| Union Hill School (historical) | School | 226 | Montgomery | 34 41 07 N | 093 28 36 W |
| Union Hill School (historical) | School | 221 | Pope | 35 30 02 N | 092 59 04 W |
| Union Hill School (historical) | School | 134 | Yell | 35 16 04 N | 093 14 35 W |
| Union Home Church | Church | 81 | Clay | 36 16 20 N | 090 10 33 W |
| Union Hope Church | Church | 223 | Scott | 35 01 17 N | 093 59 55 W |
| Union Industrial Agriculture College (historical) | School | 79 | Pulaski | 34 38 41 N | 092 13 45 W |
| Union Lake | Reservoir | 56 | Arkansas | 34 15 06 N | 091 16 54 W |
| Union Lake Dam | Dam | 56 | Arkansas | 34 15 06 N | 091 16 54 W |
| Union Liberty Church | Church | 61 | Lee | 34 49 56 N | 090 36 19 W |
| Union Liberty School (historical) | School | 61 | Lee | 34 49 56 N | 090 36 18 W |
| Union Medical Center Heliport | Airport | 79 | Union | 33 12 52 N | 092 40 05 W |
| Union Memorial Hospital | Hospital | 75 | Union | 33 13 13 N | 092 40 16 W |
| Union Methodist Church | Church | 65 | Cleveland | 33 44 40 N | 091 59 32 W |
| Union Mission Baptist Church | Church | 70 | Union | 33 12 23 N | 092 38 39 W |
| Union Mission Pentecostal Church of God | Church | 349 | Polk | 34 35 05 N | 094 14 08 W |
| Union Missionary Church | Church | 104 | Sharp | 36 01 29 N | 091 21 24 W |
| Union Rescue Mission | Church | 76 | Pulaski | 34 43 10 N | 092 15 34 W |
| Union Ridge | Ridge | 216 | Sebastian | 35 07 23 N | 094 13 06 W |
| Union Ridge Cemetery | Cemetery | 114 | Drew | 33 34 39 N | 091 46 49 W |
| Union Ridge Cemetery | Cemetery | 234 | Sebastian | 35 07 22 N | 094 11 53 W |
| Union School | School | 243 | Johnson | 35 38 04 N | 093 19 47 W |
| Union School | School | 194 | Logan | 35 10 52 N | 093 59 54 W |
| Union School | School | 79 | Lonoke | 34 49 49 N | 091 58 51 W |
| Union School | School | 148 | Sebastian | 35 23 52 N | 094 06 01 W |