US States Zip Directory 2026

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Delaware Zip Codes



Delaware Delaware is a U.S. state located on the Atlantic Coast in the Mid-Atlantic region of the United States. It is bordered to the south and west by Maryland, to the northeast by New Jersey, and to the north by Pennsylvania. The state takes its name from Thomas West, 3rd Baron De La Warr, an English nobleman and Virginia s first colonial governor, after whom what is now called Cape Henlopen was originally named.

Delaware is located in the northeastern portion of the Delmarva Peninsula and is the second least extensive, the sixth least populous, but the sixth most densely populated of the 50 United States. Delaware is divided into three counties. From north to south, these three counties are New Castle, Kent, and Sussex. While the southern two counties have historically been predominantly agricultural, New Castle County has been more industrialized.

State Zip Code City County Area Codes
DE 19730 Odessa New Castle County 302
DE 19731 Port Penn New Castle County 302
DE 19732 Rockland New Castle County 302
DE 19733 Saint Georges New Castle County 302
DE 19734 Townsend New Castle County 302, 410, 443, 667
DE 19735 Winterthur New Castle County 302
DE 19736 Yorklyn New Castle County 302
DE 19801 Wilmington New Castle County 302
DE 19802 Wilmington New Castle County 302
DE 19803 Wilmington New Castle County 302, 484, 610, 835
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Map of Delaware


ZIP codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP, an acronym for Zone Improvement Plan, is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the code in the postal address. The basic format consists of five decimal numerical digits. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the ZIP code, a hyphen, and four more digits that determine a more precise location than the ZIP code alone. The term ZIP code was originally registered as a servicemark (a type of trademark) by the U.S. Postal Service, but its registration has since expired.


ZIP codes designate only delivery points within the United States and its dependencies, as well as locations of its armed forces. There are no ZIP codes reserved for designating mail bound for foreign destinations (with the exception of U.S. military units stationed outside of the United States), and therefore, international outbound mail should not include a ZIP code in the delivery address. The last line of a foreign address must only show the name of the country of destination.