South Carolina Counties by Population (2025)

There are 46 counties in South Carolina.

Greenville County is the largest county in the state, with a population of 578,418. The most recent census shows that its population has increased by 0.10% since the previous census.

A number of other South Carolina counties also boast relatively large populations for their state, though not able to match the density of Greenville County:

• Charleston County : 434,401
• Richland County : 432,362

South Carolina Counties with the Fewest Residents

The smallest county in South Carolina is Allendale County, with a population of just 7,271. This total represents a decrease of 0.1% since the last census count was performed.

Other small counties include:

• McCormick County : 10,341
• Bamberg County : 13,022
• Calhoun County : 14,164

South Carolina Counties with Rapid Growth

Jasper County, with its current population of 36,660, has shown the largest population growth, with an increase of 0.3% since the last census.

Greenville County has also had relatively high population growth of 0.10% with 578,418 residents.

On the other hand, Allendale County has had the largest decrease in population, with its 7,271 current residents totalling 0.1% less than the previous census.