Delaware ZIP Codes

ZIP codes: 96
Cities & towns: 57
Counties: 3
Area codes: 1

How Delaware ZIP codes are numbered

197xx–199xx

The first three digits identify the sectional center facility that processes mail for a region, so a Delaware ZIP code can be placed geographically from its prefix alone. Each row names the city holding the most codes in that prefix.

Delaware three-digit ZIP prefixes, the codes in each, and the city that holds the most of them.
Prefix	ZIP codes	Main area
197xx	27	Newark
198xx	25	Wilmington
199xx	44	Dover

Where Delaware's communities sit

Each point is a Delaware community with a published ZIP code list, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Delaware cities by ZIP code count

largest 25

Area codes serving Delaware

302 Wilmington

Scope every ZIP code recorded in Delaware. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. The map outline is a convex envelope of published places, not a state boundary.