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New Castle

A town of 1,000 people in Rockingham County, New Hampshire

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Seacoast online Events - PSO Chamber Players Presents "Palette of Voices"

Seacoastonline.com · Aug 31, 2026

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About New Castle

Place in New Hampshire, United States

1693Established

1,000Population

2.4 sq miArea

20 ftElevation

New Castle is a town in Rockingham County, New Hampshire, United States. The population was 1,000 at the 2020 census. It is the easternmost town in New Hampshire and the smallest by area, and it is the only town in the state located entirely on islands. It is home to Fort Constitution Historic Site, Fort Stark Historic Site, and the New Castle Common, a 31-acre (13 ha) recreation area on the Atlantic Ocean. New Castle is also home to a United States Coast Guard station, as well as the historic Wentworth by the Sea hotel.

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From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

Town numbers

ZIP code03854

Area code603

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Schools in New Castle

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DistrictNew Castle School DistrictSchools1

Maude H. Trefethen SchoolElementary · Grades K–6 · 33 students

School data from the U.S. Department of Education (NCES). Ratings are from neighbors.

Where New Castle is

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Locator map of New Castle — Wikimedia Commons · Map: Rcsprinter123 · CC BY 3.0

Location map

New Hampshire · NH · Rockingham CountyTown boundary on OpenStreetMap →

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Bordering towns

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New Castle Portsmouth Rye Kittery

WPortsmouth SRye SEKittery

Compare side by side:New Castle vs Portsmouth New Castle vs Rye New Castle vs Kittery

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