ZIP code · East Haddam · Connecticut · United States
ZIP code 06423 — East Haddam
ZIP code 06423 serves East Haddam, Connecticut.
- Postal code
- 06423Single source Value from one source, not cross-checked.
- City
- East Haddam
- County
- Lower Connecticut River Valley
- State
- Connecticut
- Country
- United States
- Coordinates
- 41.4696, -72.4059 — precision precise (locality)
View on OpenStreetMap - Population
- 5,163 (ZCTA, ACS 5-year)
- Median household income
- $106,217
- Median age
- 50.9
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
- Area codes
- 860, 959 (from the nearest rate centre)Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Nearby localities
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS). Data generated on 2026-08-21. Methodology · Report an error on this page