ZIP CodesZIP codes in Lower Connecticut River Valley, Connecticut
Lower Connecticut River Valley, Connecticut has 25 ZIP codes in this list, from 06371 to 06498. They cover 24 places, among them Middletown, Old Lyme, South Lyme and Centerbrook.
Nothing in this county matches.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 06371 | Old Lyme | 54.0 | 41.335, -72.309 |
| 06376 | South Lyme | 0.0 | 41.297, -72.263 |
| 06409 | Centerbrook | 1.2 | 41.347, -72.417 |
| 06412 | Chester | 16.1 | 41.405, -72.464 |
| 06413 | Clinton | 16.2 | 41.291, -72.528 |
| 06414 | Cobalt | 1.1 | 41.567, -72.558 |
| 06416 | Cromwell | 12.5 | 41.611, -72.666 |
| 06417 | Deep River | 13.5 | 41.377, -72.449 |
| 06419 | Killingworth | 35.3 | 41.370, -72.571 |
| 06422 | Durham | 23.7 | 41.465, -72.688 |
| 06423 | East Haddam | 36.6 | 41.470, -72.406 |
| 06424 | East Hampton | 39.2 | 41.576, -72.509 |
| 06426 | Essex | 5.6 | 41.355, -72.397 |
| 06438 | Haddam | 14.0 | 41.463, -72.505 |
| 06439 | Hadlyme | 0.8 | 41.421, -72.414 |
| 06441 | Higganum | 24.2 | 41.468, -72.575 |
| 06442 | Ivoryton | 3.6 | 41.342, -72.440 |
| 06455 | Middlefield | 10.7 | 41.517, -72.719 |
| 06456 | Middle Haddam | 1.3 | 41.554, -72.550 |
| 06457 | Middletown | 40.7 | 41.557, -72.665 |
| 06459 | Middletown | 0.3 | 41.556, -72.658 |
| 06469 | Moodus | 10.0 | 41.508, -72.442 |
| 06475 | Old Saybrook | 15.1 | 41.291, -72.385 |
| 06480 | Portland | 23.2 | 41.585, -72.613 |
| 06498 | Westbrook | 15.8 | 41.293, -72.456 |
The ZIP code areas of Lower Connecticut River Valley add up to about 415 square miles of land (1,074 sq km) as the Census Bureau draws them. The largest is 06371 (Old Lyme), with 54.0 square miles.
Places with more than one code here: Middletown (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Old Lyme, CT 06371.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.