| ZIP Codes: | 10 ZIP Codes (8 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 843 / 854 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:39 PM |
| Population: | 166,963 [See All] |
| FIPS: | 45035 |
| CBSA: | Charleston-North Charleston, SC |
| Land Area: | 605 sq mi |
| Water Area: | 3 sq mi |
| Coordinates: | 33.0835, -80.3703 |
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166,963 residents live across 10 ZIPs covering 605 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 160,886 to 166,963 from 2014 to 2024 — a +3.8% change. 4 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 29483 (Summerville, $85,750 median) and poorest ZIP 29471 (Reevesville, $38,500) are 27.1 miles apart — a 2.2× income gap across local geography.
Median home values vary 3.8× across this county — from $90,300 in 29477 (Saint George) to $341,600 in 29485 (Summerville).
Density varies 97× across the county — from 26 people/sq mi in 29471 (Reevesville) to 2,515 in 29420 (North Charleston).
Educational attainment ranges from 10.9% bachelor's+ in 29448 (Harleyville) to 36.7% in 29485 (Summerville) — the breadth of educational profiles across the area.
Within South Carolina, this is the #11 most populous of 46 counties and ranks #12 for median household income .
Weighted by population, the typical household earns about $79,927 across the county — reflecting what a typical resident sees, not a simple ZIP average.
29.8% of adults age 25+ hold a bachelor's degree or higher (33,760 of 113,198 reporting). The most-educated ZIPs cluster around Summerville.
8 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 29483 | Summerville | Standard | 59,186 | $85,750 | 53.3 | -12.9% |
| 29485 | Summerville | Standard | 58,507 | $82,987 | 55.9 | 22.3% |
| 29420 | North Charleston | Standard | 23,959 | $72,661 | 9.5 | 0.6% |
| 29472 | Ridgeville | Standard | 12,722 | $75,325 | 189.6 | 43.2% |
| 29477 | Saint George | Standard | 7,176 | $53,894 | 108.1 | 11.0% |
| 29437 | Dorchester | Standard | 2,281 | $61,821 | 82.2 | -1.4% |
| 29448 | Harleyville | Standard | 1,997 | $71,967 | 62.6 | -7.7% |
| 29471 | Reevesville | Standard | 1,135 | $38,500 | 43.8 | -21.9% |
| 29447 | Grover | PO Box | — | — | 0.0 | — |
| 29484 | Summerville | PO Box | — | — | 0.0 | — |