There are 13 zip codes in Belknap County, New Hampshire. The most populated is 3246, located in Laconia. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
0324616,943Laconia
032497,725Gilford
032207,454Belmont
032536,701Meredith
038093,617Alton
032253,406Center Barnstead
032692,957Sanbornton
032562,591New Hampton
032372,338Gilmanton
038102,286Alton Bay
038371,622Gilmanton Iron Works
032181,535Barnstead
03226820Center Harbor

Zip Codes in Belknap County, New Hampshire by Population (2024)