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U.S. ZIP Codes Database 2026

Name: Barnwell County
Address: US

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Barnwell County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Barnwell County.

County	State	ZIP Code	City	Area Codes
Barnwell County	SC	29812	Barnwell	`803, 839`
Barnwell County	SC	29813	Hilda	`803`
Barnwell County	SC	29817	Blackville	`803, 839`
Barnwell County	SC	29826	Elko	`803, 839`
Barnwell County	SC	29853	Williston	`803, 839`

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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.