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Delaware ZIP Codes

Browse cities and ZIP codes in Delaware, learn how the state's postal system is organized, and look up any address with our free USPS-powered tool.

Looking up a Delaware ZIP code

City and ZIP code detail pages for Delaware are being added to this directory. In the meantime, you can use our free ZIP code lookup tool on the homepage to instantly find any Delaware postal code by address, city, or location. The tool is powered by official USPS address data and works for every Delaware ZIP code.

About Delaware ZIP codes

Delaware uses the standard United States Postal Service (USPS) five-digit ZIP code system, with optional ZIP+4 extensions for precise mail routing. ZIP codes in Delaware are organized into Sectional Center Facility (SCF) regions, with the first three digits identifying a postal hub and the final two identifying a specific delivery area within that hub. Knowing the correct Delaware ZIP code matters for shipping rate calculation, address verification, sales tax jurisdiction, voter registration, school district assignment, and emergency services routing.

Delaware contains a mix of urban metropolitan ZIP codes, suburban residential zones, and rural delivery routes. Larger cities are typically split across many ZIP codes that map to neighborhoods, business districts, and individual high-volume buildings, while small towns may share a single ZIP code that covers the entire municipality and surrounding unincorporated areas. Some ZIP codes are designated as unique ZIP codes for government buildings, universities, or large corporations and do not correspond to a residential delivery area at all.

How to look up a Delaware ZIP code

To find a Delaware ZIP code, the most accurate method is to enter the full street address into our ZIP code lookup tool. The tool returns the standardized USPS ZIP+4 code along with the official city name and county. If you only know the city, you can browse the city directory above to see every ZIP code assigned to that city. If you have a ZIP code and want to confirm which Delaware city it serves, type it into the search box on the homepage and the result page will display the primary city, county, latitude, and longitude.

For business mailing lists, e-commerce shipping, or marketing campaigns targeting Delaware customers, always validate addresses against current USPS data because ZIP code boundaries change as the population shifts and new delivery routes are added. Our blog covers USPS address standardization, ZIP+4 codes, and shipping rate optimization in more depth.

Delaware postal information at a glance

  • State abbreviation: DE
  • Country: United States of America
  • Postal authority: United States Postal Service (USPS)
  • ZIP code format: 5 digits, with optional 4-digit extension (ZIP+4)
  • Lookup method: Free address-based search via our homepage ZIP tool

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