Zip Code 29321 — Buffalo, SC
29321 is a ZIP Code associated with Buffalo, SC, located within Union. 29321 ranks #3 out of 4 ZIP codes in Union County by population (and #264 out of 424 in SC). The area supports an estimated population of 3,236 residents across Data Pending housing units, with a population density of 31.8 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (34.719750, -81.741510)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 29321 |
| Primary City | Buffalo |
| State / Province | SC |
| County | Union |
| Total Population | 3,236 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 31.8 people/sq mi |
| Timezone | America/New_York |
How 29321 Compares
| Metric | ZIP 29321 | Union County | SC State Average |
|---|
| Population | 3,236 | 25,071 (Total) | 5,296,225 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 31.8 /sq mi | -- | -- |
| County Pop Rank | #3 of 4 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →