26 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 6239 | Danielson | 11,417 |
| 6260 | Putnam | 9,248 |
| 6234 | Brooklyn | 8,430 |
| 6374 | Plainfield | 8,119 |
| 6281 | Woodstock | 7,369 |
| 6241 | Dayville | 6,776 |
| 6354 | Moosup | 5,331 |
| 6331 | Canterbury | 5,082 |
| 6278 | Ashford | 4,421 |
| 6259 | Pomfret Center | 4,391 |
| 6277 | Thompson | 4,328 |
| 6255 | North Grosvenordale | 4,221 |
| 6377 | Sterling | 3,032 |
| 6384 | Voluntown | 2,683 |
| 6247 | Hampton | 2,304 |
| 6235 | Chaplin | 2,193 |
| 6242 | Eastford | 1,256 |
| 6332 | Central Village | 938 |
| 6282 | Woodstock Valley | 931 |
| 6262 | Quinebaug | 670 |
| 6387 | Wauregan | 236 |
| 6264 | Scotland | 235 |
| 6263 | Rogers | 217 |
| 6243 | East Killingly | 130 |
| 6373 | Oneco | 115 |
| 6258 | Pomfret | 95 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 26 ZCTAs in Northeastern CT Planning Region, Connecticut (US Census).