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ZIP codes in New London County

39 ZIPs touch New London County, Connecticut. The blue dashed line is the county border; orange ZIPs reach into it.

39

ZIP codes

5

cross the county line

274,781

people in these ZIPs

8

counties in CT

Most people

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New London County ZIP list

More counties in Connecticut

All 8 counties in Connecticut

Questions people actually ask

How many ZIP codes are in New London County, Connecticut?

39 ZIP codes reach into New London County, including 5 PO Box or single-address ZIPs placed by the town they serve. 5 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in New London County has the most people?

06360 (Norwich) has about 37,216 residents, the most of any ZIP touching New London County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in New London County and another county?

Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in New London County. For one address, pin the exact spot on the ZIP finder to see its county.

Where does this list come from?

ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.

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Updated 2026-11-10 · Where the data comes from