New Castle, the only town in NH composed entirely of islands, covers approximately 500 acres (.8 square miles) and serves as a scenic residential and recreational community. New Castle was founded in 1623, chartered in 1679, and incorporated in 1693 during the reign of William and Mary. Today, in addition to a residential population of slightly more than 1,000, it is home to the Great Island Common recreational park, Wentworth-by-the-Sea Hotel and Spa, a UNH marine research laboratory, a Coast Guard station, and Fort Constitution and Fort Stark state parks.
Photos courtesy of Jim Cerny.
Town Clerk's office will be closed on Wednesday, May 17 due to a Regional Conference
- We are not accepting pavilion reservations until May 1, 2017 at Town Hall starting at 8am.
. Avitar Associates of N.E. 's 2016 Cyclical Revaluation is available under town news.
- Please go to "Town News" to see the report from NHDES and the Notice of Standard Maximum Contaminant Level Violations for the first quarter in 2017 for the New Castle water system.
- The Underwood Engineering "Executive Summary" is available in the news section of this front page
- For water study report go to
"STEM FROM THE START" - Statewide stem initiative to launch from Maude H. Trefethen School. See report under News Items
Need to contact the town office?
- Phone 603-431-6710
- Fax 603-433-6198
- Great Island Common 603-436-1992 (Seasonal)
- Email Us