Middlesex County, Connecticut ZIP codes
23 ZIP codes are in Middlesex County, plus 2 that cross in from neighboring counties. It's part of the Hartford-West Hartford-East Hartford, CT metro area.
- ZIP codes
- 23
- Population in these ZIPs
- 165,364
- Avg. median income
- $105,900population-weighted
- Cities & towns
- 22
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Middlesex County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 06409 | Centerbrook | 701 | $107,909 | $504,600 |
| 06412 | Chester | 3,825 | $109,191 | $540,800 |
| 06413 | Clinton | 13,377 | $124,824 | $469,000 |
| 06414 | Cobalt | 302 | $131,090 | $356,000 |
| 06416 | Cromwell | 14,334 | $110,596 | $377,700 |
| 06417 | Deep River | 4,458 | $90,253 | $441,000 |
| 06419 | Killingworth | 6,240 | $140,655 | $632,200 |
| 06422 | Durham | 7,208 | $158,857 | $508,100 |
| 06423 | East Haddam | 5,182 | $107,549 | $468,200 |
| 06424 | East Hampton | 12,751 | $123,680 | $433,900 |
| 06426 | Essex | 3,267 | $103,705 | $768,200 |
| 06438 | Haddam | 2,887 | $121,429 | $474,200 |
| 06441 | Higganum | 5,348 | $111,250 | $500,700 |
| 06442 | Ivoryton | 2,826 | $104,358 | $547,900 |
| 06455 | Middlefield | 2,480 | $104,180 | $428,000 |
| 06456 | Middle Haddam | 281 | $128,542 | $434,000 |
| 06457 | Middletown | 46,720 | $79,463 | $365,700 |
| 06459 | Middletown | 1,238 | — | — |
| 06469 | Moodus | 3,311 | $104,888 | $401,300 |
| 06475 | Old Saybrook | 10,575 | $114,333 | $698,800 |
| 06480 | Portland | 9,434 | $118,929 | $415,200 |
| 06481 | Rockfall | 1,763 | $84,674 | $406,500 |
| 06498 | Westbrook | 6,856 | $91,202 | $583,800 |
ZIP codes partly in Middlesex County
These ZIP codes are mostly in a neighboring county but cover part of Middlesex County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 06415 | Colchester | New London County | 16,038 | $123,256 | $444,900 |
| 06420 | Salem | New London County | 4,368 | $123,425 | $476,800 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Middlesex County
Nearby counties
Frequently asked questions
How many ZIP codes are in Middlesex County, Connecticut?
23 ZIP codes are mainly in Middlesex County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Middlesex County?
ZIP codes in Middlesex County use the city names Centerbrook, Chester, Clinton, Cobalt, Cromwell, Deep River, Durham, East Haddam, East Hampton, Essex, Haddam and Higganum and others.
What metro area is Middlesex County in?
Middlesex County is part of the Hartford-West Hartford-East Hartford, CT metropolitan statistical area.