26 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 6010 | Bristol | 61,077 |
| 6484 | Shelton | 41,206 |
| 6770 | Naugatuck | 31,741 |
| 6704 | Waterbury | 30,124 |
| 6708 | Waterbury | 29,215 |
| 6410 | Cheshire | 28,775 |
| 6705 | Waterbury | 25,744 |
| 6488 | Southbury | 19,936 |
| 6401 | Ansonia | 19,361 |
| 6483 | Seymour | 16,766 |
| 6716 | Wolcott | 16,094 |
| 6706 | Waterbury | 15,459 |
| 6795 | Watertown | 14,190 |
| 6478 | Oxford | 12,801 |
| 6418 | Derby | 11,966 |
| 6710 | Waterbury | 10,684 |
| 6798 | Woodbury | 9,775 |
| 6712 | Prospect | 9,411 |
| 6786 | Terryville | 9,398 |
| 6779 | Oakville | 7,987 |
| 6762 | Middlebury | 7,665 |
| 6787 | Thomaston | 7,502 |
| 6403 | Beacon Falls | 6,061 |
| 6751 | Bethlehem | 3,399 |
| 6702 | Waterbury | 3,260 |
| 6782 | Plymouth | 2,314 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 26 ZCTAs in Naugatuck Valley Planning Region, Connecticut (US Census).