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U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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Chester County ZIP Codes

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

County State ZIP Code City Area Codes
Chester County PA 19333 Devon 484, 610, 835
Chester County PA 19335 Downingtown 484, 610, 835
Chester County PA 19341 Exton 484, 610, 835
Chester County PA 19343 Glenmoore 484, 610, 835
Chester County PA 19344 Honey Brook 223, 484, 610, 717, 835
Chester County PA 19345 Immaculata 484, 610, 835
Chester County PA 19346 Kelton 484, 610, 835
Chester County PA 19347 Kemblesville 484, 610, 835
Chester County PA 19348 Kennett Square 484, 610, 835
Chester County PA 19350 Landenberg 302, 410, 443, 484, 610, 667, 835
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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.