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U.S. ZIP Codes Database 2026

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Loudoun County ZIP Codes

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

County State ZIP Code City Area Codes
Loudoun County VA 20132 Purcellville 227, 240, 301, 304, 540, 571, 681, 703, 826
Loudoun County VA 20134 Purcellville 540
Loudoun County VA 20141 Round Hill 304, 540, 681, 826
Loudoun County VA 20142 Round Hill 540
Loudoun County VA 20146 Ashburn 571, 703
Loudoun County VA 20147 Ashburn 227, 240, 301, 571, 703
Loudoun County VA 20148 Ashburn 571, 703
Loudoun County VA 20149 Ashburn 571
Loudoun County VA 20152 Chantilly 571, 703
Loudoun County VA 20158 Hamilton 540, 571, 703, 826
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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.