U.S. postal lookup

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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Delaware County ZIP Codes

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

County State ZIP Code City Area Codes
Delaware County OK 74368 Twin Oaks 539, 918
Delaware County PA 19008 Broomall 484, 610, 835
Delaware County PA 19010 Bryn Mawr 484, 610, 835
Delaware County PA 19013 Chester 484, 610, 835, 856
Delaware County PA 19014 Aston 484, 610, 835
Delaware County PA 19015 Brookhaven 484, 610, 835
Delaware County PA 19016 Chester 484
Delaware County PA 19017 Chester Heights 484, 610, 835
Delaware County PA 19018 Clifton Heights 484, 610, 835
Delaware County PA 19022 Crum Lynne 484, 610, 835, 856
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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.