Delaware ZIP codes

All 96 ZIPs in Delaware, 19701 to 19980. Tap one on the map or in the list.

ZIP codes

1,021,605

people live in them

counties

PO Box & no-area ZIPs

Most people

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All 96 Delaware ZIP codes

ZIP codes by county

Pick a county for its ZIP list and map. Counts include ZIPs that only partly reach into the county.

Questions people actually ask

How many ZIP codes are in Delaware?

96 ZIP codes are in use in Delaware. 68 cover a delivery area, and 28 are PO Box, single-building or organization ZIPs with no area of their own.

What do Delaware ZIP codes start with?

Delaware ZIP codes start with these three-digit prefixes: 197–199. Each prefix is a mail sorting area run from one processing center.

Which Delaware ZIP code has the most people?

19720 in New Castle has the most residents of any Delaware ZIP, about 62,392 people in the Census Bureau’s ACS 2020–2024 estimates.

Which Delaware county has the most ZIP codes?

New Castle County touches 54 ZIP codes, the most of the 3 counties in Delaware. 6 Delaware ZIPs reach into more than one county.

Are these the official USPS ZIP code boundaries?

The map uses Census ZIP Code Tabulation Areas, the standard public stand-in for USPS delivery areas. They match for almost every home. For a mailing address, the USPS ZIP Code lookup has the final word.

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Updated 2026-11-10 · Where the data comes from