Barnwell County, South Carolina ZIP codes
5 ZIP codes are in Barnwell County, plus 3 that cross in from neighboring counties.
- ZIP codes
- 5
- Population in these ZIPs
- 21,456
- Avg. median income
- $47,900population-weighted
- Cities & towns
- 5
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ZIP codes in Barnwell County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 29812 | Barnwell | 11,132 | $51,870 | $180,100 |
| 29813 PO Box | Hilda | — | — | — |
| 29817 | Blackville | 4,139 | $41,579 | $111,700 |
| 29826 | Elko | 241 | — | $78,600 |
| 29853 | Williston | 5,944 | $44,983 | $147,300 |
ZIP codes partly in Barnwell County
These ZIP codes are mostly in a neighboring county but cover part of Barnwell County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 29836 | Martin | Allendale County | 326 | — | $108,200 |
| 29843 | Olar | Bamberg County | 934 | $35,986 | $133,100 |
| 29849 | Ulmer | Allendale County | 271 | $89,583 | $161,100 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Barnwell County
Nearby counties
Frequently asked questions
How many ZIP codes are in Barnwell County, South Carolina?
5 ZIP codes are mainly in Barnwell County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in Barnwell County?
ZIP codes in Barnwell County use the city names Barnwell, Blackville, Elko, Hilda and Williston.