16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 03820 | Dover | 33,440 |
| 03867 | Rochester | 22,732 |
| 03824 | Durham | 15,080 |
| 03878 | Somersworth | 12,205 |
| 03825 | Barrington | 9,489 |
| 03835 | Farmington | 6,804 |
| 03868 | Rochester | 6,133 |
| 03861 | Lee | 4,576 |
| 03851 | Milton | 4,333 |
| 03884 | Strafford | 4,306 |
| 03839 | Rochester | 4,279 |
| 03855 | New Durham | 2,748 |
| 03869 | Rollinsford | 2,456 |
| 03823 | Madbury | 2,203 |
| 03887 | Union | 1,739 |
| 03852 | Milton Mills | 205 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Strafford County, New Hampshire (US Census).