ZIP Code 06423 – East Haddam, CT
East Haddam, Connecticut · Lower Connecticut River Valley Planning Region · Eastern time
| ZIP code | 06423 |
|---|---|
| City | East Haddam |
| State | Connecticut |
| County | Lower Connecticut River Valley Planning Region |
| Population | 5,182 |
| Time zone | Eastern · local time |
| ZIP type | Standard (has a Census ZCTA area) |
| Land area | 36.57 sq mi |
| Center (lat, long) | 41.4566, -72.3914 |
Area codes in this area
These are the area codes that most often serve ZIP 06423 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
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Nearby ZIP codes
About ZIP 06423
ZIP code 06423 is assigned to East Haddam, Connecticut. It lies in Lower Connecticut River Valley Planning Region. Its Census area covers about 36.57 square miles of land. The closest neighboring ZIP is 06439 (Hadlyme), about 2.9 miles away.
Every address in 06423 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.
Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources