Connecticut ZIP codes
Connecticut holds 429 ZIP codes between 06001 and 06927. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Connecticut
| Place | ZIP codes |
|---|---|
| Hartford | 36 |
| New Haven | 28 |
| Stamford | 17 |
| Waterbury | 16 |
| Bridgeport | 10 |
| Norwalk | 10 |
| West Hartford | 7 |
| Danbury | 6 |
| Manchester | 4 |
| New Britain | 4 |
| East Hartford | 4 |
| Wallingford | 4 |
| Westport | 4 |
| Farmington | 3 |
| Fairfield | 3 |
| Cheshire | 3 |
| Hamden | 3 |
| Greenwich | 3 |
| Storrs Mansfield | 2 |
| Windsor | 2 |
Connecticut counties by ZIP count
| County | ZIP codes |
|---|---|
| Capitol Region | 119 |
| Western Connecticut | 64 |
| South Central Regional | 48 |
| Naugatuck Valley | 41 |
| Southeastern Connecticut | 36 |
| Northwest Hills | 34 |
| Northeastern Connecticut | 31 |
| Lower Connecticut River Valley | 25 |
| Connecticut Metropolitan | 20 |
| Tolland | 4 |
Reading a Connecticut ZIP code
Connecticut holds 429 ZIP codes between 06001 and 06927, spread over 15 counties. Hartford leads the state with 36 codes, ahead of New Haven with 28. Every code here opens with the digit 0: that opening number is the national postal region Connecticut 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 Hartford spreads across 36 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 Connecticut; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources