
Newcastle
New Hampshire's Only Island Town — Smallest by Land, Richest by Sea
Part of the Portsmouth area
Visit Portsmouth guideWhat Newcastle is like
From the community
Nearby
within 25 miAbout Newcastle
New Castle is the smallest town in New Hampshire and the only one located entirely on an island, connected to Portsmouth and Rye by short bridges over the Piscataqua River and Little Harbor. Portsmouth Harbor Lighthouse, its 48-foot tower built in 1877, stands guard at the harbor entrance from historic Fort Constitution — the site of Paul Revere's lesser-known first ride and what some historians call the first overt act of the American Revolution. Fort Stark, another coastal fortification, offers a window into the region's military past. Sandy Beach and New Castle Common provide scenic ocean access, with the Coast Guard station at one end and a seaside park at the other. Grand oceanfront homes line Wentworth Road, and the views across to Kittery, Maine change color with every tide. With a population of about 800, this is one of the most exclusive and historic communities on the New Hampshire seacoast.
Why Newcastle?
- Only island town in New Hampshire with ocean on all sides
- Portsmouth Harbor Lighthouse and Fort Constitution — Revolutionary War history
- Sandy Beach and New Castle Common for family ocean access
- Walking distance to downtown Portsmouth dining and culture
- Lowest property tax rate in the state at $5.39 per $1,000
Quick Facts
Weather in Newcastle
Partly Cloudy
Today
77 / 68
Mon
76 / 67
Tue
87 / 61
Map
Living in Newcastle
What you need to know about making Newcastle your home.
Major Employers
Schools & Education
The tiny Maude H. Trefethen School serves about 26 students with exceptional test scores; older students attend Portsmouth's middle and high schools.
Cost of Living
One of the most expensive communities in New Hampshire with a median home price over $2 million, offset by the state's lowest property tax rate at $5.39 per $1,000.
Real Estate
$2,200,000 median home price
$5.39 per $1,000 property tax rate
No state income or sales tax in NH
View listings in NewcastleCommute Times
School District
Regional district
Portsmouth School District(SAU 52)
Grades served: PreK-12
Students attend high school in Portsmouth.
Newcastle serves as a district hub for students from nearby towns in this district.
District towns
Events near Newcastle
Safe Harbor Swim School is opening at the Best Western in Portsmouth
Monday Night Movies
Save the Date: Registration August 3-18, 2026
Sambucca Boys Invitational
Summer Art Program for Kids at Aplomb
New Hampshire Art Association at the 93rd Annual League of NH Craftsmen’s Fair
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