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Zip Code 03837 — Gilmanton Iron Works, NH

03837 is a ZIP Code associated with Gilmanton Iron Works, NH, located within Belknap. The postal region supports an estimated population of 1,451 residents across Data Pending housing units, with a population density of 28.1 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (43.422710, -71.327660)

Data Metric	Local Statistic
Postal / Zip Code	03837
Primary City	Gilmanton Iron Works
State / Province	NH
County	Belknap
Total Population	1,451
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	28.1 people/sq mi
Timezone	America/New_York

How 03837 Compares

Metric	ZIP 03837	Belknap County	NH State Average
Population	1,451	60,615	1,394,951
Median Income	Data Pending	N/A	N/A
Population Density	28.1 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 03237	Gilmanton	2.8 mi	2,575	N/A
Zip 03809	Alton	6.2 mi	3,680	N/A
Zip 03225	Center Barnstead	6.2 mi	3,834	N/A
Zip 03218	Barnstead	6.4 mi	1,160	N/A
Zip 03810	Alton Bay	7.6 mi	2,314	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →