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
City
Population
03246Laconia16,943
03249Gilford7,725
03220Belmont7,454
03253Meredith6,701
03809Alton3,617
03225Center Barnstead3,406
03269Sanbornton2,957
03256New Hampton2,591
03237Gilmanton2,338
03810Alton Bay2,286
03837Gilmanton Iron Works1,622
03218Barnstead1,535
03226Center Harbor820

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