Massachusetts ZIP codes
Massachusetts holds 685 ZIP codes between 01001 and 05544. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Massachusetts
| Place | ZIP codes |
|---|---|
| Boston | 36 |
| Springfield | 19 |
| Worcester | 15 |
| New Bedford | 6 |
| Lynn | 6 |
| Cambridge | 6 |
| Fall River | 5 |
| Andover | 5 |
| Chicopee | 5 |
| Framingham | 5 |
| Lowell | 5 |
| Brockton | 5 |
| Haverhill | 4 |
| Lawrence | 4 |
| Woburn | 4 |
| Waltham | 4 |
| Quincy | 4 |
| Pittsfield | 3 |
| Amherst | 3 |
| Northampton | 3 |
Massachusetts counties by ZIP count
| County | ZIP codes |
|---|---|
| Middlesex | 111 |
| Worcester | 99 |
| Plymouth | 61 |
| Essex | 57 |
| Barnstable | 55 |
| Hampden | 53 |
| Suffolk | 53 |
| Norfolk | 45 |
| Bristol | 44 |
| Berkshire | 38 |
Reading a Massachusetts ZIP code
Massachusetts holds 685 ZIP codes between 01001 and 05544, spread over 14 counties. Boston leads the state with 36 codes, ahead of Springfield with 19. Every code here opens with the digit 0: that opening number is the national postal region Massachusetts 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 Boston 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 Massachusetts; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources