ZIP codes in Lower Connecticut River Valley County
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- 06371 Old LymeLower Connecticut River Valley County
- 06376 South LymeLower Connecticut River Valley County
- 06409 CenterbrookLower Connecticut River Valley County
- 06412 ChesterLower Connecticut River Valley County
- 06413 ClintonLower Connecticut River Valley County
- 06414 CobaltLower Connecticut River Valley County
- 06416 CromwellLower Connecticut River Valley County
- 06417 Deep RiverLower Connecticut River Valley County
- 06419 KillingworthLower Connecticut River Valley County
- 06422 DurhamLower Connecticut River Valley County
- 06423 East HaddamLower Connecticut River Valley County
- 06424 East HamptonLower Connecticut River Valley County
- 06426 EssexLower Connecticut River Valley County
- 06438 HaddamLower Connecticut River Valley County
- 06439 HadlymeLower Connecticut River Valley County
- 06441 HigganumLower Connecticut River Valley County
- 06442 IvorytonLower Connecticut River Valley County
- 06455 MiddlefieldLower Connecticut River Valley County
- 06456 Middle HaddamLower Connecticut River Valley County
- 06457 MiddletownLower Connecticut River Valley County
- 06459 MiddletownLower Connecticut River Valley County
- 06469 MoodusLower Connecticut River Valley County
- 06475 Old SaybrookLower Connecticut River Valley County
- 06480 PortlandLower Connecticut River Valley County
- 06481 MiddlefieldLower Connecticut River Valley County
- 06498 WestbrookLower Connecticut River Valley County