The largest county in South Carolina
There are two right answers. By land area it is Horry County; by population it is Greenville County. Which one you want depends on what you meant by largest.
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.
By land area
| Rank | Name | Land area | Population |
|---|---|---|---|
| 1 | Horry County | 1,133 sq mi | 427,551 |
| 2 | Orangeburg County | 1,106 sq mi | 83,177 |
| 3 | Berkeley County | 1,104 sq mi | 274,666 |
| 4 | Aiken County | 1,071 sq mi | 181,515 |
| 5 | Colleton County | 1,057 sq mi | 39,382 |
| 6 | Williamsburg County | 934.2 sq mi | 29,662 |
| 7 | Charleston County | 918.1 sq mi | 436,200 |
| 8 | Georgetown County | 813.7 sq mi | 65,912 |
| 9 | Spartanburg County | 808.4 sq mi | 380,857 |
| 10 | Florence County | 800.5 sq mi | 138,504 |
By population
| Rank | Name | Population | Density |
|---|---|---|---|
| 1 | Greenville County | 583,125 | 742 per sq mi |
| 2 | Charleston County | 436,200 | 475 per sq mi |
| 3 | Richland County | 434,956 | 574 per sq mi |
| 4 | Horry County | 427,551 | 377 per sq mi |
| 5 | Spartanburg County | 380,857 | 471 per sq mi |
| 6 | Lexington County | 317,588 | 455 per sq mi |
| 7 | York County | 306,887 | 451 per sq mi |
| 8 | Berkeley County | 274,666 | 249 per sq mi |
| 9 | Anderson County | 219,930 | 308 per sq mi |
| 10 | Beaufort County | 204,433 | 355 per sq mi |
And the smallest
More on South Carolina
Rebuilt from source data 30 August 2026. How these figures are produced.