| ZIP Codes: | 34 ZIP Codes (20 Standard, 11 PO Box, 3 Unique) [See All] |
| Area Codes: | 843 / 854 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:39 PM |
| Population: | 400,685 [See All] |
| FIPS: | 45019 |
| CBSA: | Charleston-North Charleston, SC |
| Land Area: | 948 sq mi |
| Water Area: | 79 sq mi |
| Coordinates: | 32.8157, -79.9766 |
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400,685 residents live across 34 ZIPs covering 948 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 356,060 to 400,685 from 2014 to 2024 — a +12.5% change. 17 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 29482 (Sullivans Island, $192,813 median) and poorest ZIP 29406 (Charleston, $49,815) are 16.6 miles apart — a 3.9× income gap across local geography.
Median home values vary 9.9× across this county — from $201,300 in 29426 (Adams Run) to $2,000,001 in 29482 (Sullivans Island).
Density varies 3663× across the county — from 14 people/sq mi in 29458 (Mc Clellanville) to 51,792 in 29424 (Charleston).
Educational attainment ranges from 20.6% bachelor's+ in 29418 (North Charleston) to 84.3% in 29482 (Sullivans Island) — the breadth of educational profiles across the area.
Within South Carolina, this is the #3 most populous of 46 counties and ranks #1 for median household income with the #12 fastest decade growth .
Hosts 3 single-entity Unique ZIPs: 29425Medical University Of Sc ; 29409The Citadel ; and 29424The College Of Charleston .
Weighted by population, the typical household earns about $94,304 across the county — reflecting what a typical resident sees, not a simple ZIP average.
51.2% of adults age 25+ hold a bachelor's degree or higher (148,987 of 290,851 reporting). The most-educated ZIPs cluster around Charleston.
20 Standard delivery, 11 PO Box only, 3 single-entity Unique ZIPs serve this county.
8 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
3 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 3.9× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 29464 | Mount Pleasant | Standard | 53,045 | $111,907 | 34.2 | 14.4% |
| 29466 | Mount Pleasant | Standard | 44,942 | $133,357 | 32.5 | 46.5% |
| 29414 | Charleston | Standard | 44,727 | $99,529 | 46.4 | 25.3% |
| 29412 | Charleston | Standard | 39,256 | $101,509 | 41.3 | 6.5% |
| 29407 | Charleston | Standard | 36,706 | $85,367 | 17.8 | 6.8% |
| 29406 | Charleston | Standard | 32,001 | $49,815 | 15.5 | 3.2% |
| 29455 | Johns Island | Standard | 27,576 | $121,372 | 112.2 | 28.7% |
| 29405 | North Charleston | Standard | 26,254 | $56,600 | 18.3 | -5.9% |
| 29418 | North Charleston | Standard | 26,052 | $64,583 | 13.8 | 7.8% |
| 29403 | Charleston | Standard | 22,533 | $66,944 | 6.7 | 2.9% |
| 29401 | Charleston | Standard | 9,339 | $99,667 | 2.5 | -13.3% |
| 29449 | Hollywood | Standard | 8,024 | $56,929 | 92.7 | 1.5% |
| 29470 | Ravenel | Standard | 5,639 | $86,410 | 83.1 | 24.1% |
| 29429 | Awendaw | Standard | 4,479 | $112,244 | 103.1 | 41.8% |
| 29451 | Isle Of Palms | Standard | 4,362 | $156,979 | 10.4 | 2.1% |
| 29487 | Wadmalaw Island | Standard | 2,703 | $105,592 | 52.3 | -5.6% |
| 29458 | Mc Clellanville | Standard | 2,505 | $86,431 | 177.2 | -0.8% |
| 29404 | Charleston Afb | Standard | 2,334 | $54,716 | 5.2 | 72.9% |
| 29482 | Sullivans Island | Standard | 2,087 | $192,813 | 2.9 | 2.2% |
| 29409 | Charleston | Unique | 2,056 | — | 0.1 | -5.6% |
| 29426 | Adams Run | Standard | 1,697 | $64,087 | 68.9 | 11.3% |
| 29424 | Charleston | Unique | 1,243 | — | 0.0 | 254.1% |
| 29439 | Folly Beach | PO Box | 1,125 | $137,396 | 11.3 | -49.3% |
| 29425 | Charleston | Unique | 0 | — | 0.2 | — |
| 29417 | Charleston | PO Box | — | — | 0.0 | — |
| 29413 | Charleston | PO Box | — | — | 0.0 | — |
| 29416 | Charleston | PO Box | — | — | 0.0 | — |
| 29402 | Charleston | PO Box | — | — | 0.0 | — |
| 29457 | Johns Island | PO Box | — | — | 0.0 | — |
| 29422 | Charleston | PO Box | — | — | 0.0 | — |
| 29465 | Mount Pleasant | PO Box | — | — | 0.0 | — |
| 29423 | Charleston | PO Box | — | — | 0.0 | — |
| 29419 | North Charleston | PO Box | — | — | 0.0 | — |
| 29415 | North Charleston | PO Box | — | — | 0.0 | — |