Belknap County ZIP Codes
New Hampshire, United States · 19 codes
Belknap County in New Hampshire has 19 ZIP codes, from 03218 to 03837, serving 19 places.
ZIP codes in Belknap
Frequently asked questions
What is the ZIP code of Belknap?
Belknap has 19 ZIP codes, from 03218 to 03837. The table lists the places each one serves.
How many places are listed in Belknap County?
19 places.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.