| ZIP Codes: | 7 ZIP Codes (7 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 843 / 854 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:41 PM |
| Population: | 28,628 [See All] |
| FIPS: | 45089 |
| Land Area: | 800 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 33.6395, -79.7383 |
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28,628 residents live across 7 ZIPs covering 800 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 31,158 to 28,628 from 2014 to 2024 — a -8.1% change. 2 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 29518 (Cades, $61,923 median) and poorest ZIP 29590 (Salters, $31,115) are 15.6 miles apart — a 2.0× income gap across local geography.
Median home values vary 2.9× across this county — from $74,400 in 29590 (Salters) to $212,200 in 29518 (Cades).
Density varies 3× across the county — from 19 people/sq mi in 29580 (Nesmith) to 58 in 29556 (Kingstree).
Educational attainment ranges from 13.6% bachelor's+ in 29590 (Salters) to 24.4% in 29056 (Greeleyville) — the breadth of educational profiles across the area.
Within South Carolina, this is the #31 most populous of 46 counties and ranks #38 for median household income .
Weighted by population, the typical household earns about $46,240 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.2% of adults age 25+ hold a bachelor's degree or higher (3,835 of 21,017 reporting).
7 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
Williamsburg County lost 8.1% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 29556 | Kingstree | Standard | 10,559 | $42,365 | 181.1 | -15.6% |
| 29554 | Hemingway | Standard | 8,681 | $55,100 | 236.8 | -4.9% |
| 29590 | Salters | Standard | 3,480 | $31,115 | 108.6 | -8.5% |
| 29056 | Greeleyville | Standard | 2,203 | $47,031 | 102.7 | -9.5% |
| 29580 | Nesmith | Standard | 1,322 | $50,156 | 68.6 | 14.5% |
| 29564 | Lane | Standard | 1,262 | $40,000 | 51.4 | 65.8% |
| 29518 | Cades | Standard | 1,121 | $61,923 | 51.1 | -17.9% |