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New Castle, New Hampshire – Historic Coastal Living on the Piscataqua River. 

New Castle, New Hampshire is one of the Seacoast’s most historic and distinctive communities. Located on a small island at the mouth of the Piscataqua River, New Castle combines centuries of New England history with some of the most scenic waterfront surroundings on the New Hampshire coast.

Dating back to the early 1600s, New Castle remains deeply connected to its colonial and maritime roots. Winding roads, antique homes, stone walls, and views of the Piscataqua River and Atlantic Ocean give the town a timeless coastal character that feels unlike anywhere else on the Seacoast. In several areas of town, historic homes that have stood for generations continue to overlook the harbor and surrounding waterways.

Many people are drawn to New Castle for its quiet atmosphere, waterfront beauty, and strong sense of place. Residents enjoy a lifestyle centered around boating, walking, nearby beaches, historic landmarks, and dramatic water views, all while being just minutes from downtown Portsmouth.

The community is home to Fort Constitution, the Wentworth by the Sea area, and nearby Great Island Common, where residents and visitors gather to enjoy ocean views, walking paths, picnics, and sunsets over the harbor. The coastline, working harbor activity, and changing tides create an everyday connection to the water that defines life in New Castle.

Housing opportunities range from historic antique homes and charming coastal cottages to luxury waterfront estates with panoramic river and ocean views. Buyers are often drawn to the town’s privacy, limited size, and uniquely coastal New England atmosphere.

For those considering relocation to the New Hampshire Seacoast, New Castle offers a rare combination of history, waterfront living, natural beauty, and quiet coastal charm — all within one of New Hampshire’s most iconic seaside communities.

Find Homes for Sale in New Castle

Looking for homes in New Hampshire's coastal communities? Take a peek at all properties available in New Castle below. If you see a listing you like, contact us and we'll take you on a tour!


Selling Your New Castle Home?

Own a home in New Castle? We're ready to put your property in the spotlight. Tell us about your property below to get started or contact us for more information.

By giving us your phone number and email address, you are giving Jim Lee & Ann Cummings permission to contact you via email, phone, or text.

Let Us Show You Around Town

A view of the Great Bay National Estuarine Research Reserve between tall pine trees as the sun sets.

Originally founded in 1623, this cozy community now serves as recreational and tranquil residential community. Known originally as "The Great Island", New Castle was the largest of several islands in the mouth of the Piscataqua River. New Castle is connected to the 'mainland' of New Hampshire via the causeway to Portsmouth and a drawbridge to Rye.

The current population of New Castle is about 1,100 residents, giving it a population density of about 1,276 people per square mile. Island residents love seaside living, and many activities and events are centered around being outdoors.  Great Island Common, a beloved local park, often serves as the epicenter of activity for visitors and residents alike.

Why You'll Love to Call New Castle Home:

child coloring with crayons

New Castle has excellent local schools

New Castle residents have their own elementary school, Maude H. Trefethen Elementary School, which is currently ranked the best public elementary school within the state of New Hampshire. Serving students from kindergarten to sixth grade, students then move off the island to Portsmouth or Rye for middle school and high school.
tight knit community

A Tight-Knit Community

This coastal community is not only known for its wonderful amenities and scenic views, but the friendly residents that create a vibrant local culture. With many events hosted throughout the year, the town of New Castle and surrounding communities encourage natives and residents alike to celebrate life with food, fun, and entertainment.

Get to know your neighbors at local traditions such as the 7th Annual Evening by the Sea Event and 5th Annual Freecoast Festival.

kayaking and adventures for every age

Adventures for Every Age

With such a unique location, it comes as no surprise that the residents of the community spend most of their days outdoors! Enjoy a wide array of recreational activities including hiking, biking, and kayaking during the summer and sledding and tubing in the winter.


Looking to delve deeper in to New Castle’s past? Take a day trip to one of the historic landmarks of New Castle! Dating back to the 1600s, this area offers plenty of unique attractions to explore from the Portsmouth Harbor Lighthouse to the living history museum of Strawberry Banke.

perfect location

Perfectly Located

Although it is an island, modern conveniences have made it easy to travel to the surrounding areas and communities of New Castle. Take a quick drive across the bridge to be transported to the picturesque community of Portsmouth, which offers unique attractions of its own. Only an hour away, travel to Concord, New Hampshire to see the planetarium at the famous McAuliffe-Shepard Discovery Center.

Talk To The Local Experts

Once you're here, you can't help but fall in love with everything this community has to offer. We are so grateful to live and work in this amazing area, so we can't wait to introduce you to New Castle and the entire New Hampshire Seacoast.

If you're considering buying or selling a home in New Castle, contact us. As longtime Portsmouth residents and experienced local Realtors, we have a wealth of resources about everything from moving tips to ways to increase your home's value. Let's talk.

Call or text us at 603-436-1221.

Copyright ©2026 PrimeMLS, Inc. All rights reserved. This information is deemed reliable, but not guaranteed. The data relating to real estate displayed on this display comes in part from the IDX Program of PrimeMLS.

The information being provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data last updated 06/04/26 12:47 PM

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