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County ZIP codes · Connecticut · FIPS 09011

New London County, CT ZIP Codes

New London County, Connecticut has 38 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 33 residential and 5 for PO boxes or a single organization. 4 of the residential ones extend into a neighboring county. Median household income ranges from $59,170 in 06320 (New London) to $137,425 in 06355 (Mystic) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of New London County?

06249 · Lebanon: $109k06254 · North Franklin: $105k06320 · New London: $59k06330 · Baltic: $99k06333 · East Lyme: $129k06334 · Bozrah: $108k06335 · Gales Ferry: $118k06336 · Gilman: $134k06338 · Mashantucket: $138k06339 · Ledyard: $106k06340 · Groton: $82k06350 · Hanover: $41k06351 · Jewett City: $83k06353 · Montville: –06355 · Mystic: $137k06357 · Niantic: $93k06359 · North Stonington: $124k06360 · Norwich: $66k06365 · Preston: $117k06370 · Oakdale: $106k06371 · Old Lyme: $132k06375 · Quaker Hill: $112k06376 · South Lyme: $156k06378 · Stonington: $136k06379 · Pawcatuck: $95k06380 · Taftville: $64k06382 · Uncasville: $90k06384 · Voluntown: $107k06385 · Waterford: $101k06389 · Yantic: –06415 · Colchester: $123k06420 · Salem: $123k06439 · Hadlyme: $187k064150624906371063510635906365063850638406370063400633306420063600633906330062540637806355063820633406357063790633506375063200633806249 · Lebanon: $109k06254 · North Franklin: $105k06320 · New London: $59k06330 · Baltic: $99k06333 · East Lyme: $129k06334 · Bozrah: $108k06335 · Gales Ferry: $118k06336 · Gilman: $134k06338 · Mashantucket: $138k06339 · Ledyard: $106k06340 · Groton: $82k06350 · Hanover: $41k06351 · Jewett City: $83k06353 · Montville: –06355 · Mystic: $137k06357 · Niantic: $93k06359 · North Stonington: $124k06360 · Norwich: $66k06365 · Preston: $117k06370 · Oakdale: $106k06371 · Old Lyme: $132k06375 · Quaker Hill: $112k06376 · South Lyme: $156k06378 · Stonington: $136k06379 · Pawcatuck: $95k06380 · Taftville: $64k06382 · Uncasville: $90k06384 · Voluntown: $107k06385 · Waterford: $101k06389 · Yantic: –06415 · Colchester: $123k06420 · Salem: $123k06439 · Hadlyme: $187k064150624906371063510635906365063850638406370063400633306420063600633906330062540637806355063820633406357063350637506249 · Lebanon: $109k06254 · North Franklin: $105k06320 · New London: $59k06330 · Baltic: $99k06333 · East Lyme: $129k06334 · Bozrah: $108k06335 · Gales Ferry: $118k06336 · Gilman: $134k06338 · Mashantucket: $138k06339 · Ledyard: $106k06340 · Groton: $82k06350 · Hanover: $41k06351 · Jewett City: $83k06353 · Montville: –06355 · Mystic: $137k06357 · Niantic: $93k06359 · North Stonington: $124k06360 · Norwich: $66k06365 · Preston: $117k06370 · Oakdale: $106k06371 · Old Lyme: $132k06375 · Quaker Hill: $112k06376 · South Lyme: $156k06378 · Stonington: $136k06379 · Pawcatuck: $95k06380 · Taftville: $64k06382 · Uncasville: $90k06384 · Voluntown: $107k06385 · Waterford: $101k06389 · Yantic: –06415 · Colchester: $123k06420 · Salem: $123k06439 · Hadlyme: $187k064150624906371063510635906365063850638406370063400636006339063300625406378
The residential ZIP codes of New London County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $93,026 and $118,116.

They carry 33 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 33 residential ZIP codes in New London County

Residential ZIP codes mainly in New London County, largest first; "In this county" is the share of the ZIP's residents in the county
In this county
06360 Norwich 37,216 1,388 $66k $246k 100%
06340 Groton 29,863 1,325 $82k $295k 100%
06320 New London 27,703 4,921 $59k $253k 100%
06415 Colchester 16,038 287 $123k $366k 95%
06385 Waterford 15,966 641 $101k $365k 100%
06351 Jewett City 15,760 300 $83k $294k 100%
06355 Mystic 12,173 858 $137k $453k 100%
06357 Niantic 11,332 1,070 $93k $397k 100%
06382 Uncasville 10,143 577 $90k $268k 100%
06371 Old Lyme 9,828 182 $132k $499k 100%
06339 Ledyard 9,113 356 $106k $331k 100%
06379 Pawcatuck 9,017 738 $95k $406k 100%
06333 East Lyme 7,389 315 $129k $439k 100%
06370 Oakdale 7,327 307 $106k $333k 100%
06249 Lebanon 7,116 132 $109k $346k 100%
06335 Gales Ferry 6,307 576 $118k $322k 100%
06378 Stonington 5,555 266 $136k $593k 100%
06359 North Stonington 5,160 95 $124k $397k 100%
06365 Preston 4,807 158 $117k $361k 100%
06420 Salem 4,368 148 $123k $406k 99%
06375 Quaker Hill 3,670 459 $112k $326k 100%
06330 Baltic 3,327 194 $99k $279k 89%
06380 Taftville 2,757 2,860 $64k $194k 100%
06384 Voluntown 2,663 71 $107k $355k 97%
06334 Bozrah 2,249 116 $108k $310k 100%
06254 North Franklin 2,004 102 $105k $326k 100%
06353 Montville 439 1,657 – – 100%
06350 Hanover 121 314 $41k – 100%
06376 South Lyme 89 3,296 $156k $444k 100%
06439 Hadlyme 65 83 $187k $663k 100%
06336 Gilman 44 72 $134k – 100%
06338 Mashantucket 27 14 $138k $433k 100%
06389 Yantic no residents 0 – – 100%

Download the 38 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by residents (simplemaps county weights; Connecticut keeps its historical counties).

Which ZIP codes cross the county line?

4 ZIP codes of New London County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's residents in New London County and in the neighboring counties
ZIPIn New LondonElsewhere
0641595%Middlesex County 5%
0642099%Middlesex County 1%
0633089%Windham County 11%
0638497%Windham County 3%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (Connecticut: simplemaps county weights by residents).

PO Box and single-organization ZIP codes

ZIP codes in New London County without a residential area (GeoNames postal codes)
ZIPPostal name
06349Groton
06372Old Mystic
06383Versailles
06388West Mystic
06474North Westchester

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do New London County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. New London County's ZIP codes use 3 prefixes: 062, 063 and 064.

Three-digit prefixes of New London County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are New London County's
PrefixSectional centerHereAll codes
062 Hartford, CT (SCF 060) 2 41
063 Hartford, CT (SCF 060) 32 40
064 Hartford, CT (SCF 060) 4 64

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.