Delaware ZIP codes
Delaware holds 96 ZIP codes between 19701 and 19980. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Delaware
| Place | ZIP codes |
|---|---|
| Wilmington | 25 |
| Newark | 10 |
| Dover | 5 |
| New Castle | 3 |
| Dover Afb | 1 |
| Camden Wyoming | 1 |
| Cheswold | 1 |
| Clayton | 1 |
| Felton | 1 |
| Frederica | 1 |
| Harrington | 1 |
| Hartly | 1 |
| Houston | 1 |
| Kenton | 1 |
| Little Creek | 1 |
| Magnolia | 1 |
| Marydel | 1 |
| Smyrna | 1 |
| Viola | 1 |
| Woodside | 1 |
Delaware counties by ZIP count
| County | ZIP codes |
|---|---|
| New Castle | 52 |
| Sussex | 23 |
| Kent | 21 |
Reading a Delaware ZIP code
Delaware holds 96 ZIP codes between 19701 and 19980, spread over 3 counties. Wilmington leads the state with 25 codes, ahead of Newark with 10. Every code here opens with the digit 1: that opening number is the national postal region Delaware belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Wilmington spreads across 25 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Delaware; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources