| Official Name: | South Union, South Carolina |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Carolina#USA |
| Pushpin Label: | South Union |
| Coordinates: | 34.5508°N -83.0517°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Carolina |
| Subdivision Type2: | County |
| Subdivision Name2: | Oconee |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 2.62 |
| Area Land Sq Mi: | 2.60 |
| Area Water Sq Mi: | 0.02 |
| Area Total Km2: | 6.79 |
| Area Land Km2: | 6.74 |
| Area Water Km2: | 0.04 |
| Population As Of: | 2020 |
| Population Density Km2: | 50.57 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 909 |
| Postal Code Type: | ZIP Codes |
| Postal Code: | 29693 (Westminster) 29643 (Fair Play) |
| Area Codes: | 864, 821 |
| Blank Name: | FIPS code |
| Blank Info: | 45-68210 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2812980 |
| Population Total: | 341 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 130.95 |
South Union is an unincorporated community and census-designated place (CDP) in Oconee County, South Carolina, United States. It was first listed as a CDP prior to the 2020 census with a population of 341.[2]
The CDP is in southern Oconee County, bordered to the southwest by the Chickasaw Point CDP. South Carolina Highway 11, the Cherokee Foothills Scenic Highway, runs through South Union, leading south 5miles to South Carolina Exit 1 on Interstate 85. To the north the highway provides access to Westminster, 9miles to the northwest, and Seneca, to the northeast. South Carolina Highway 182 runs through the east side of South Union, leading southeast 5miles to Fair Play and northeast 4miles to South Carolina Highway 24 at Oakway.
| White alone (NH) | 317 | 92.96% | |
| Black or African American alone (NH) | 3 | 0.88% | |
| Native American or Alaska Native alone (NH) | 0 | 0.00% | |
| Asian alone (NH) | 0 | 0.00% | |
| Pacific Islander alone (NH) | 0 | 0.00% | |
| Some Other Race alone (NH) | 4 | 1.17% | |
| Mixed Race/Multi-Racial (NH) | 8 | 2.35% | |
| Hispanic or Latino (any race) | 9 | 2.64% | |
| Total | 341 | 100.00% |