Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/CT/COUNTY/LOWER-CONNECTICUT-RIVER-VALLEY-PLANNING-REGION

Lower Connecticut River Valley Planning Region, CT ZIP codes

There are 25 ZIP codes in Lower Connecticut River Valley Planning Region, CT, in 24 towns, from 06371 to 06498. The largest are 06457 (Middletown), 06416 (Cromwell) and 06413 (Clinton).

Connecticut abolished county government in 1960, and since 2022 the Census Bureau counts nine planning regions in place of its eight counties. ZIP codes are still placed by the old counties, so each one here is also listed under its county. Its ZIP codes are in Middlesex County (22) and New London County (3).

ZIP codes
25
Towns
24
County FIPS
09130
Population
175,822
Median household income
$104,428
Land area
424 sq mi

Lower Connecticut River Valley Planning Region ZIP codes by town

Each ZIP code is listed under the region its central point lies in and the town the Postal Service names it for.

Map of Lower Connecticut River Valley Planning Region ZIP codes

06371063760640906412064130641406416064170641906422064230642406426064380643906441064420645506456064570645906469064750648006498

The ZIP codes of Lower Connecticut River Valley Planning Region, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Lower Connecticut River Valley Planning Region in numbers

About 175,822 people live in Lower Connecticut River Valley Planning Region, in 74,068 households. The median household income is $104,428 a year, 9% above the Connecticut median of $95,781 (US: $80,734). The median owner-occupied home is valued at $379,700 (3% above the Connecticut median), and median gross rent is $1,454 a month. The median age is 45.9; 46.0% of adults 25 and over hold a bachelor's degree or higher (42.5% across Connecticut); the average commute takes 26 minutes.

Population175,822Lower Connecticut River Valley Planning Region175,822
Households74,068Lower Connecticut River Valley Planning Region74,068
Median age45.9Lower Connecticut River Valley Planning Region45.9Connecticut41.1US 38.9
Median household income$104,428Lower Connecticut River Valley Planning Region$104,428Connecticut$95,781US $80,734
Median home value$379,700Lower Connecticut River Valley Planning Region$379,700Connecticut$366,900US $332,700
Median gross rent$1,454Lower Connecticut River Valley Planning Region$1,454Connecticut$1,488US $1,413
Bachelor's degree or higher46.0%Lower Connecticut River Valley Planning Region46.0%Connecticut42.5%US 35.7%
Mean commute26.0 minLower Connecticut River Valley Planning Region26.0 minConnecticut26.5 minUS 26.4 min
Population density415 / sq miLower Connecticut River Valley Planning Region415 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Not sure you are in Lower Connecticut River Valley Planning Region? What county am I in? answers from your location, near a county line included.

Every ZIP code in Lower Connecticut River Valley Planning Region, with figures

ZIP codes in Lower Connecticut River Valley Planning Region
ZIP City Type Population Median income Median home
06371 Old Lyme , CT Standard 9,828 $132,045 $499,400
06376 South Lyme , CT Standard 89 $156,000 $444,400
06409 Centerbrook , CT Standard 701 $107,909 $387,300
06412 Chester , CT Standard 3,825 $109,191 $442,200
06413 Clinton , CT Standard 13,377 $124,824 $380,000
06414 Cobalt , CT Standard 302 $131,090 $356,000
06416 Cromwell , CT Standard 14,334 $110,596 $325,200
06417 Deep River , CT Standard 4,458 $90,253 $362,200
06419 Killingworth , CT Standard 6,240 $140,655 $446,200
06422 Durham , CT Standard 7,208 $158,857 $424,800
06423 East Haddam , CT Standard 5,182 $107,549 $373,700
06424 East Hampton , CT Standard 12,751 $123,680 $347,800
06426 Essex , CT Standard 3,267 $103,705 $729,200
06438 Haddam , CT Standard 2,887 $121,429 $362,500
06439 Hadlyme , CT Standard 65 $187,083 $662,500
06441 Higganum , CT Standard 5,348 $111,250 $393,100
06442 Ivoryton , CT Standard 2,826 $104,358 $468,200
06455 Middlefield , CT Standard 2,480 $104,180 $388,700
06456 Middle Haddam , CT Standard 281 $128,542 $434,000
06457 Middletown , CT Standard 46,720 $79,463 $295,300
06459 Middletown , CT Standard 1,238 — —
06469 Moodus , CT Standard 3,311 $104,888 $300,000
06475 Old Saybrook , CT Standard 10,575 $114,333 $538,200
06480 Portland , CT Standard 9,434 $118,929 $337,400
06498 Westbrook , CT Standard 6,856 $91,202 $434,300

Cite this page

zipcodes.pro. “Lower Connecticut River Valley Planning Region ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ct/county/lower-connecticut-river-valley-planning-region

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