Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Spring Hill Cemetery | Cemetery | 203 | Union | 34 38 56 N | 081 49 09 W |
| Spring Hill Church | Church | 203 | Union | 34 38 55 N | 081 49 09 W |
| Steen Cemetery | Cemetery | 159 | Union | 34 39 29 N | 081 33 55 W |
| Sugar Creek | Stream | | Union | 34 41 40 N | 081 42 10 W |
| Sulphur Spring Branch | Stream | | Union | 34 48 32 N | 081 47 32 W |
| Sulphur Springs Cemetery | Cemetery | 195 | Union | 34 48 45 N | 081 46 57 W |
| Sulphur Springs Church | Church | 197 | Union | 34 48 46 N | 081 46 53 W |
| Sunset Memorial Gardens | Cemetery | 165 | Union | 34 42 58 N | 081 34 15 W |
| Swift Run | Stream | | Union | 34 35 37 N | 081 34 44 W |
| Swink Creek | Stream | | Union | 34 46 20 N | 081 42 41 W |
| Swink-Little Cemetery | Cemetery | 172 | Union | 34 44 19 N | 081 39 52 W |
| Tabernacle Baptist Church | Church | 190 | Union | 34 42 17 N | 081 37 03 W |
| Tempie Hill | Populated Place | 183 | Union | 34 43 35 N | 081 41 18 W |
| Thomas Cemetery | Cemetery | 138 | Union | 34 42 38 N | 081 28 45 W |
| Thomas Chapel | Church | 153 | Union | 34 37 37 N | 081 32 48 W |
| Thompson Bridge | Bridge | 140 | Union | 34 48 20 N | 081 44 39 W |
| Thompson Church | Church | 177 | Union | 34 48 35 N | 081 45 54 W |
| Thompson School | School | 175 | Union | 34 48 31 N | 081 45 34 W |
| Tinker Creek | Stream | | Union | 34 34 45 N | 081 34 39 W |
| Tinker Creek Church (historical) | Church | 133 | Union | 34 37 35 N | 081 34 51 W |
| Tinker Creek School (historical) | School | 160 | Union | 34 39 03 N | 081 34 20 W |
| Tinker Creek School (historical) | School | 148 | Union | 34 36 49 N | 081 34 16 W |
| Tinsley Bridge | Bridge | 153 | Union | 34 50 14 N | 081 46 56 W |
| Tuckertown | Populated Place | 135 | Union | 34 31 35 N | 081 29 09 W |
| Turners Pond | Reservoir | 168 | Union | 34 45 12 N | 081 41 05 W |
| Turners Pond Dam D-2150 | Dam | 168 | Union | 34 45 12 N | 081 41 05 W |
| Tyger River | Stream | | Union | 34 29 43 N | 081 25 26 W |
| Tyger Work Center | Locale | 182 | Union | 34 42 00 N | 081 36 44 W |
| Union | Populated Place | 196 | Union | 34 42 55 N | 081 37 25 W |
| Union Academy | School | 177 | Union | 34 43 57 N | 081 38 58 W |
| Union Academy (historical) | School | 186 | Union | 34 42 42 N | 081 37 28 W |
| Union Branch School (historical) | School | 182 | Union | 34 51 23 N | 081 37 12 W |
| Union Carnegie Library | Building | 189 | Union | 34 42 47 N | 081 37 09 W |
| Union Church | Church | 157 | Union | 34 43 12 N | 081 34 12 W |
| Union City Hall | Building | 193 | Union | 34 42 57 N | 081 37 30 W |
| Union Community Hospital (historical) | Hospital | 183 | Union | 34 42 47 N | 081 37 33 W |
| Union Country Club | Locale | 190 | Union | 34 41 17 N | 081 37 52 W |
| Union County | Civil | 178 | Union | 34 42 00 N | 081 37 59 W |
| Union County Airport-Troy Shelton Field | Airport | 179 | Union | 34 41 12 N | 081 38 28 W |
| Union County Courthouse | Building | 193 | Union | 34 42 55 N | 081 37 32 W |
| Union County Fairgrounds | Locale | 191 | Union | 34 43 38 N | 081 38 14 W |
| Union County Home | Building | 201 | Union | 34 45 52 N | 081 38 15 W |
| Union County Jail | Building | 191 | Union | 34 42 55 N | 081 37 33 W |
| Union County Pond D-2151 Dam | Dam | 192 | Union | 34 45 42 N | 081 38 17 W |
| Union Downtown Historic District | Park | 187 | Union | 34 43 02 N | 081 37 26 W |
| Union High School | School | 195 | Union | 34 42 57 N | 081 36 53 W |
| Union Memorial Gardens | Cemetery | 188 | Union | 34 41 38 N | 081 36 41 W |
| Union Plaza Shopping Center | Locale | 187 | Union | 34 41 56 N | 081 36 52 W |
| Union Seventh Day Adventist Church | Church | 186 | Union | 34 43 14 N | 081 37 28 W |
| Union Square Shopping Center | Locale | 197 | Union | 34 43 49 N | 081 38 24 W |
| Union Water Works Pond | Reservoir | 169 | Union | 34 43 36 N | 081 36 59 W |
| Union Water Works Pond Dam D-2154 | Dam | 169 | Union | 34 43 36 N | 081 36 59 W |
| Unionville Female Academy (historical) | School | 194 | Union | 34 43 03 N | 081 37 16 W |
| Unionville Male Academy (historical) | School | 188 | Union | 34 42 41 N | 081 37 09 W |
| Unity Methodist Church | Church | 192 | Union | 34 42 10 N | 081 37 10 W |
| University of South Carolina Regional Campus | School | 193 | Union | 34 42 58 N | 081 37 11 W |
| Upper Fairforest Cemetery | Cemetery | 207 | Union | 34 45 59 N | 081 38 27 W |
| Upper Fairforest Church | Church | 202 | Union | 34 46 03 N | 081 38 26 W |
| Upper Rice Bridge | Bridge | 126 | Union | 34 42 57 N | 081 42 35 W |
| Vanderford Branch | Stream | | Union | 34 44 49 N | 081 28 59 W |
| Vernon Bridge | Bridge | 146 | Union | 34 42 33 N | 081 48 49 W |
| Veterans Memorial park | Park | 164 | Union | 34 43 27 N | 081 36 45 W |
| Wallace Cemetery | Cemetery | 145 | Union | 34 42 35 N | 081 44 46 W |
| Wallace Thomson Hospital | Hospital | 174 | Union | 34 42 43 N | 081 37 44 W |
| Ward Cemetery | Cemetery | 193 | Union | 34 48 55 N | 081 41 09 W |
| WBCU-AM (Union) | Tower | 181 | Union | 34 43 10 N | 081 39 43 W |
| Weber-Haile Cemetery | Cemetery | 197 | Union | 34 49 50 N | 081 41 24 W |
| Weleyan Methodist Episcopal Church (historical) | Church | 177 | Union | 34 42 50 N | 081 37 54 W |
| Wesley Chapel | Church | 163 | Union | 34 46 09 N | 081 31 21 W |
| Wesley Chapel Cemetery | Cemetery | 169 | Union | 34 46 07 N | 081 31 24 W |
| West End School | School | 178 | Union | 34 42 54 N | 081 37 53 W |
| West Springs | Populated Place | 216 | Union | 34 46 15 N | 081 46 54 W |
| West Springs Branch | Stream | | Union | 34 45 17 N | 081 47 38 W |
| West Springs Cemetery | Cemetery | 207 | Union | 34 46 27 N | 081 47 26 W |
| West Springs Church | Church | 207 | Union | 34 46 28 N | 081 47 27 W |
| West Springs Church (historical) | Church | 202 | Union | 34 45 40 N | 081 46 54 W |
| West Springs Elementary School (historical) | School | 208 | Union | 34 46 22 N | 081 47 03 W |
| West Springs School (historical) | School | 202 | Union | 34 45 41 N | 081 46 54 W |
| Westside Baptist Church | Church | 183 | Union | 34 42 56 N | 081 37 56 W |
| White Oak Hunt Camp | Locale | 155 | Union | 34 33 39 N | 081 31 09 W |
| White Pines Lake | Reservoir | 153 | Union | 34 48 42 N | 081 42 30 W |
| White Pines Lake | Reservoir | 147 | Union | 34 48 42 N | 081 43 29 W |
| White Pines Lake Dam D-2149 | Dam | 153 | Union | 34 48 42 N | 081 42 30 W |
| Whitlock Lakes | Reservoir | 162 | Union | 34 49 45 N | 081 42 38 W |
| Whitmire Lookout | Locale | 145 | Union | 34 31 20 N | 081 35 24 W |
| Whitmire Lookout Tower | Tower | 145 | Union | 34 31 20 N | 081 35 25 W |
| Wilburns School (historical) | School | 173 | Union | 34 40 47 N | 081 42 44 W |
| Wildcat (historical) | Populated Place | 197 | Union | 34 38 11 N | 081 49 54 W |
| Wildcat Branch | Stream | | Union | 34 36 23 N | 081 45 29 W |
| Wilsons Creek | Stream | | Union | 34 28 34 N | 081 33 07 W |
| Wood Cemetery | Cemetery | 166 | Union | 34 51 36 N | 081 33 21 W |
| Woodson Church | Church | 184 | Union | 34 46 00 N | 081 40 52 W |
| Woodson School (historical) | School | 182 | Union | 34 45 58 N | 081 40 54 W |
| Wrights Mill (historical) | Locale | 104 | Union | 34 33 13 N | 081 40 43 W |
| Wyatts School (historical) | School | 158 | Union | 34 43 06 N | 081 46 44 W |
| A H Parsons Pond Dam D-3088 | Dam | 11 | Williamsburg | 33 33 19 N | 079 44 35 W |
| Ackerman Pond | Reservoir | 11 | Williamsburg | 33 28 37 N | 079 37 59 W |
| Ackerman Pond Dam D-3096 | Dam | 11 | Williamsburg | 33 28 37 N | 079 37 59 W |
| Aimwell School (historical) | School | 17 | Williamsburg | 33 27 28 N | 079 41 16 W |
| Allen Chapel | Church | 21 | Williamsburg | 33 44 60 N | 079 50 55 W |
| Allen Chapel School (historical) | School | 21 | Williamsburg | 33 44 58 N | 079 51 00 W |
| Allen Church | Church | 21 | Williamsburg | 33 45 11 N | 079 50 58 W |
| Alligator Bay | Swamp | 14 | Williamsburg | 33 26 60 N | 079 40 24 W |
| Anderson Primary School | School | 18 | Williamsburg | 33 40 19 N | 079 49 14 W |
| Andrews | Populated Place | 8 | Williamsburg | 33 27 05 N | 079 33 39 W |
| Antioch | Populated Place | 9 | Williamsburg | 33 28 48 N | 079 35 47 W |
| Antioch Church | Church | 6 | Williamsburg | 33 28 22 N | 079 34 48 W |
| Antioch Church | Church | 22 | Williamsburg | 33 31 54 N | 079 53 05 W |
| Ard Crossroads | Populated Place | 16 | Williamsburg | 33 47 02 N | 079 26 11 W |
| Asbury Church | Church | 10 | Williamsburg | 33 31 36 N | 079 35 08 W |