26 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 06010 | Bristol | 61,684 |
| 06484 | Shelton | 41,889 |
| 06770 | Naugatuck | 31,823 |
| 06704 | Waterbury | 31,713 |
| 06708 | Waterbury | 29,594 |
| 06410 | Cheshire | 28,904 |
| 06705 | Waterbury | 25,266 |
| 06488 | Southbury | 20,071 |
| 06401 | Ansonia | 19,315 |
| 06483 | Seymour | 16,889 |
| 06716 | Wolcott | 16,113 |
| 06706 | Waterbury | 15,551 |
| 06795 | Watertown | 13,889 |
| 06478 | Oxford | 12,991 |
| 06418 | Derby | 12,205 |
| 06710 | Waterbury | 9,942 |
| 06798 | Woodbury | 9,833 |
| 06786 | Terryville | 9,768 |
| 06712 | Prospect | 9,458 |
| 06779 | Oakville | 8,364 |
| 06762 | Middlebury | 7,807 |
| 06787 | Thomaston | 7,509 |
| 06403 | Beacon Falls | 6,147 |
| 06751 | Bethlehem | 3,423 |
| 06702 | Waterbury | 2,946 |
| 06782 | Plymouth | 1,978 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 26 ZCTAs in Naugatuck Valley Planning Region, Connecticut (US Census).