Lower Connecticut River Valley Planning Region, Connecticut ZIP Codes

Zip Code
City
Population
06457Middletown46,720
06416Cromwell14,334
06413Clinton13,377
06424East Hampton12,751
06475Old Saybrook10,575
06371Old Lyme9,828
06480Portland9,434
06422Durham7,208
06498Westbrook6,856
06419Killingworth6,240
06441Higganum5,348
06423East Haddam5,182
06417Deep River4,458
06412Chester3,825
06469Moodus3,311
06426Essex3,267
06438Haddam2,887
06442Ivoryton2,826
06455Middlefield2,480
06481Rockfall1,763
06459Middletown1,238
06409Centerbrook701
06414Cobalt302
06456Middle Haddam281
06376South Lyme89
06439Hadlyme65

Overview of ZIP Codes in Lower Connecticut River Valley Planning Region

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
26
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 26 ZCTAs in Lower Connecticut River Valley Planning Region, Connecticut (US Census).