| ZIP Codes: | 6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 843 / 854 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:54:59 PM |
| Population: | 25,875 [See All] |
| FIPS: | 45069 |
| Land Area: | 454 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 34.6147, -79.6407 |
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25,875 residents live across 6 ZIPs covering 454 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 27,965 to 25,875 from 2014 to 2024 — a -7.5% change. 1 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 29516 (Blenheim, $57,639 median) and poorest ZIP 29525 (Clio, $28,618) are 7.9 miles apart — a 2.0× income gap across local geography.
Median home values vary 1.6× across this county — from $52,900 in 29516 (Blenheim) to $86,400 in 29512 (Bennettsville).
Density varies 7× across the county — from 12 people/sq mi in 29516 (Blenheim) to 81 in 29512 (Bennettsville).
Educational attainment ranges from 3.1% bachelor's+ in 29596 (Wallace) to 12.9% in 29525 (Clio) — the breadth of educational profiles across the area.
Within South Carolina, this is the #36 most populous of 46 counties and ranks #45 for median household income .
Weighted by population, the typical household earns about $34,540 across the county — reflecting what a typical resident sees, not a simple ZIP average.
8.9% of adults age 25+ hold a bachelor's degree or higher (1,657 of 18,693 reporting).
5 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Marlboro County lost 7.5% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 29512 | Bennettsville | Standard | 17,197 | $34,734 | 211.7 | -8.5% |
| 29570 | Mc Coll | Standard | 4,141 | $30,768 | 51.8 | 5.8% |
| 29596 | Wallace | Standard | 1,910 | $34,682 | 63.2 | -16.6% |
| 29525 | Clio | Standard | 1,665 | $28,618 | 53.1 | -12.7% |
| 29516 | Blenheim | Standard | 882 | $57,639 | 74.3 | -5.8% |
| 29594 | Tatum | PO Box | 80 | $53,125 | 0.4 | -36.0% |