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.

42,735 verified records

All states and U.S. territories

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State directory

Delaware ZIP Codes

Complete postal directory, details, and geographic map for the State of Delaware.

State	ZIP Code	City	County	Area Codes
DE	19896	Wilmington	New Castle County	`302`
DE	19897	Wilmington	New Castle County	`302`
DE	19898	Wilmington	New Castle County	`302`
DE	19899	Wilmington	New Castle County	`302`
DE	19901	Dover	Kent County	`302`
DE	19902	Dover AFB	Kent County	`302`
DE	19903	Dover	Kent County	`302`
DE	19904	Dover	Kent County	`302`
DE	19905	Dover	Kent County	`302`
DE	19906	Dover	Kent County	`302`

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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.