New London County, CT ZIP codes
There are 38 ZIP codes in New London County, CT, in 37 towns, from 06249 to 06474. The largest are 06360 (Norwich), 06340 (Groton) and 06320 (New London).
Connecticut abolished county government in 1960, and since 2022 the Census Bureau counts nine planning regions instead of its eight counties. New London County has no government of its own, but the counties are still how Connecticut's towns and ZIP codes are placed. Its ZIP codes lie in the Southeastern Connecticut, Lower Connecticut River Valley and Northeastern Connecticut planning regions.
- ZIP codes
- 38
- Towns
- 37
- County FIPS
09011- State
- Connecticut
- Population
- 269,636
- Land area
- 665 sq mi
Land area from the Census Bureau's 2020 Gazetteer, the last to list New London County. Population is the sum of the ZIP codes listed here (American Community Survey 2020–2024), since the Bureau now counts Connecticut by planning region.
New London County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of New London County ZIP codes
The ZIP codes of New London County, 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.
New London County in numbers
About 269,636 people live in New London County, in 112,221 households, the 4th most populous of Connecticut's 8 counties.
| Population | 269,636 |
|---|---|
| Households | 112,221 |
| Population density | 405 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, summed over the 38 ZIP codes listed here, as the Bureau no longer publishes figures for New London County; medians do not add up and are left out. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in New London County
| Town | ZIP codes | Population |
|---|---|---|
| Norwich | 1 | 39,973 |
| New London | 1 | 27,625 |
| Uncasville | 1 | 10,143 |
| Old Lyme | 1 | 9,828 |
| Groton | 2 | 9,490 |
| Ledyard | 1 | 9,113 |
| East Lyme | 1 | 7,389 |
| Oakdale | 1 | 7,327 |
| Lebanon | 1 | 7,116 |
| Pawcatuck | 1 | 5,577 |
| North Stonington | 1 | 5,160 |
| Preston | 1 | 4,807 |
| Colchester | 1 | 4,692 |
| Mystic | 1 | 4,483 |
| Salem | 1 | 4,368 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with New London County.
Not sure you are in New London County? What county am I in? answers from your location, near a county line included.
Every ZIP code in New London County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
06249 | Lebanon , CT | Standard | 7,116 | $109,135 | $345,900 |
06254 | North Franklin , CT | Standard | 2,004 | $105,000 | $326,200 |
06320 | New London , CT | Standard | 27,703 | $59,170 | $253,300 |
06330 | Baltic , CT | Standard | 3,327 | $98,698 | $279,400 |
06333 | East Lyme , CT | Standard | 7,389 | $129,083 | $439,000 |
06334 | Bozrah , CT | Standard | 2,249 | $107,969 | $310,400 |
06335 | Gales Ferry , CT | Standard | 6,307 | $118,116 | $322,400 |
06336 | Gilman , CT | Standard | 44 | $133,750 | — |
06338 | Mashantucket , CT | Standard | 27 | $137,500 | $433,300 |
06339 | Ledyard , CT | Standard | 9,113 | $106,403 | $330,500 |
06340 | Groton , CT | Standard | 29,863 | $81,792 | $294,700 |
06349 | Groton , CT | No street area | — | — | — |
06350 | Hanover , CT | Standard | 121 | $40,950 | — |
06351 | Jewett City , CT | Standard | 15,760 | $82,976 | $294,400 |
06353 | Montville , CT | Standard | 439 | — | — |
06355 | Mystic , CT | Standard | 12,173 | $137,425 | $453,400 |
06357 | Niantic , CT | Standard | 11,332 | $93,026 | $397,300 |
06359 | North Stonington , CT | Standard | 5,160 | $123,938 | $397,100 |
06360 | Norwich , CT | Standard | 37,216 | $65,539 | $245,700 |
06365 | Preston , CT | Standard | 4,807 | $117,045 | $361,400 |
06370 | Oakdale , CT | Standard | 7,327 | $105,700 | $332,500 |
06371 | Old Lyme , CT | Standard | 9,828 | $132,045 | $499,400 |
06372 | Old Mystic , CT | No street area | — | — | — |
06375 | Quaker Hill , CT | Standard | 3,670 | $111,833 | $326,000 |
06376 | South Lyme , CT | Standard | 89 | $156,000 | $444,400 |
06378 | Stonington , CT | Standard | 5,555 | $135,714 | $593,400 |
06379 | Pawcatuck , CT | Standard | 9,017 | $95,066 | $406,100 |
06380 | Taftville , CT | Standard | 2,757 | $63,452 | $194,300 |
06382 | Uncasville , CT | Standard | 10,143 | $89,635 | $267,800 |
06383 | Versailles , CT | No street area | — | — | — |
06384 | Voluntown , CT | Standard | 2,663 | $106,518 | $354,900 |
06385 | Waterford , CT | Standard | 15,966 | $100,484 | $365,400 |
06388 | West Mystic , CT | No street area | — | — | — |
06389 | Yantic , CT | Standard | 0 | — | — |
06415 | Colchester , CT | Standard | 16,038 | $123,256 | $366,300 |
06420 | Salem , CT | Standard | 4,368 | $123,425 | $405,800 |
06439 | Hadlyme , CT | Standard | 65 | $187,083 | $662,500 |
06474 | North Westchester , CT | No street area | — | — | — |
Cite this page
zipcodes.pro. “New London County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ct/county/new-london
Underlying data is public domain or openly licensed — sources, vintages and licences.