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U.S. ZIP Codes Database 2026

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Harnett County ZIP Codes

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

County State ZIP Code City Area Codes
Harnett County NC 28335 Dunn 910
Harnett County NC 28339 Erwin 472, 910
Harnett County NC 28368 Olivia 919, 984
Harnett County NC 28390 Spring Lake 472, 910, 919, 984
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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.