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ZIP codes

ZIP codes in Lower Connecticut River Valley Planning Region, Connecticut

Lower Connecticut River Valley Planning Region has 28 ZIP codes. 26 lie entirely inside it and 2 are shared with neighboring counties, so part of their land and their people are elsewhere. About 176,556 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes
28
With 1% or more of their land inside
Entirely inside
26
99% or more of their land
Shared with other counties
2
Most with Southeastern Connecticut Planning Region (2)
Most populated ZIP
06457
46,720 people · Middletown
Least populated ZIP
06439
65 people
Largest ZIP by land
06371
54 sq mi

Map of the ZIP codes in Lower Connecticut River Valley Planning Region

Capitol Planning Region South Central Connecticut Planning Region Southeastern Connecticut Planning Region 06371 · 9,828 people · 100% in the county 06376 · 89 people · 100% in the county 06409 · Essex Village · 701 people · 100% in the county 06412 · Chester Center · 3,825 people · 100% in the county 06413 · Clinton · 13,377 people · 100% in the county 06414 · 302 people · 100% in the county 06415 · Colchester · 16,038 people · 13% in the county 06416 · 14,334 people · 100% in the county 06417 · Deep River Center · 4,458 people · 100% in the county 06419 · 6,240 people · 100% in the county 06420 · 4,368 people · 2.1% in the county 06422 · Durham · 7,208 people · 100% in the county 06423 · Moodus · 5,182 people · 100% in the county 06424 · Lake Pocotopaug · 12,751 people · 100% in the county 06426 · Essex Village · 3,267 people · 100% in the county 06438 · Higganum · 2,887 people · 100% in the county 06439 · 65 people · 100% in the county 06441 · Higganum · 5,348 people · 100% in the county 06442 · 2,826 people · 100% in the county 06455 · 2,480 people · 100% in the county 06456 · 281 people · 100% in the county 06457 · Middletown · 46,720 people · 100% in the county 06459 · Middletown · 1,238 people · 100% in the county 06469 · Moodus · 3,311 people · 100% in the county 06475 · Old Saybrook Center · 10,575 people · 100% in the county 06480 · Portland · 9,434 people · 100% in the county 06481 · 1,763 people · 100% in the county 06498 · Westbrook Center · 6,856 people · 100% in the county
  • Entirely in the county (99% or more of its land)
  • Shared, mostly in other counties
  • Neighboring counties
Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Lower Connecticut River Valley Planning Region

28 ZIP codes in Lower Connecticut River Valley Planning Region, CT, by number
ZIP code Main city Population Land in the county Residents in the county
06371 — 9,828 100% 9,828
06376 — 89 100% 89
06409 Essex Village 701 100% 701
06412 Chester Center 3,825 100% 3,825
06413 Clinton 13,377 100% 13,377
06414 — 302 100% 302
06415 Colchester 16,038 13% ≈ 1,107
06416 — 14,334 100% 14,334
06417 Deep River Center 4,458 100% 4,458
06419 — 6,240 100% 6,240
06420 — 4,368 2.1% ≈ 103
06422 Durham 7,208 100% 7,208
06423 Moodus 5,182 100% 5,182
06424 Lake Pocotopaug 12,751 100% 12,751
06426 Essex Village 3,267 100% 3,267
06438 Higganum 2,887 100% 2,887
06439 — 65 100% 65
06441 Higganum 5,348 100% 5,348
06442 — 2,826 100% 2,826
06455 — 2,480 100% 2,480
06456 — 281 100% 281
06457 Middletown 46,720 100% 46,720
06459 Middletown 1,238 100% 1,238
06469 Moodus 3,311 100% 3,311
06475 Old Saybrook Center 10,575 100% 10,575
06480 Portland 9,434 100% 9,434
06481 — 1,763 100% 1,763
06498 Westbrook Center 6,856 100% 6,856

ZIP codes shared with other counties

These 2 ZIP codes have part of their land in another county. The first figure is the share of their land in Lower Connecticut River Valley Planning Region; then, where the rest lies.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Essex Village (2), Higganum (2), Middletown (2), Moodus (2), Chester Center (1), and Clinton (1); 13 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 063 and 064.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

  • U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
  • U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
  • U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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