Carroll County, New Hampshire has 31 ZIP codes in this list, from 03227 to 03897. They cover 31 places, among them Center Sandwich, Moultonborough, North Sandwich and Bartlett.
The ZIP code areas of Carroll County add up to about 951 square miles of land (2,462 sq km) as the Census Bureau draws them. The largest is 03813 (Center Conway), with 98.3 square miles.
Using these codes
In an address, the ZIP code comes last, after the city and the two-letter state: Center Sandwich, NH 03227.
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