Connecticut ZIP codes

All 429 ZIPs in Connecticut, 06001 to 06927. Tap one on the map or in the list.

429

ZIP codes

3,624,508

people live in them

counties

141

PO Box & no-area ZIPs

Most people

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All 429 Connecticut ZIP codes

ZIP codes by county

Pick a county for its ZIP list and map. Counts include ZIPs that only partly reach into the county.

Questions people actually ask

How many ZIP codes are in Connecticut?

429 ZIP codes are in use in Connecticut. 288 cover a delivery area, and 141 are PO Box, single-building or organization ZIPs with no area of their own.

What do Connecticut ZIP codes start with?

Connecticut ZIP codes start with these three-digit prefixes: 060–069. Each prefix is a mail sorting area run from one processing center.

Which Connecticut ZIP code has the most people?

06902 in Stamford has the most residents of any Connecticut ZIP, about 73,392 people in the Census Bureau’s ACS 2020–2024 estimates.

Which Connecticut county has the most ZIP codes?

Hartford County touches 110 ZIP codes, the most of the 8 counties in Connecticut. 11 Connecticut ZIPs reach into more than one county.

Are these the official USPS ZIP code boundaries?

The map uses Census ZIP Code Tabulation Areas, the standard public stand-in for USPS delivery areas. They match for almost every home. For a mailing address, the USPS ZIP Code lookup has the final word.

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