ZIP codes in Southeastern Connecticut, Connecticut
Southeastern Connecticut, Connecticut has 36 ZIP codes in this list, from 06226 to 06474. They cover 35 places, among them Groton, Willimantic, Lebanon and North Franklin.
The ZIP code areas of Southeastern Connecticut add up to about 573 square miles of land (1,483 sq km) as the Census Bureau draws them. The largest is 06415 (Colchester), with 56.0 square miles.
Places with more than one code here: Groton (2 codes).
Using these codes
In an address, the ZIP code comes last, after the city and the two-letter state: Willimantic, CT 06226.
Tap a ZIP code to open it in the look-up, with a copy button for the address line.
A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
"No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.
ZIP Codes