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.
- We are not accepting pavilion reservations until May 1, 2017
. 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 third quarter in 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
- The Town will be picking up Christmas trees devoid of ornaments/tinsel when put out at curb side staring the first week in January.
- Trashpick up notice - when there are storm warning, please make sure that trash and recycling can be curb side by 6:45 rather than the usual 7am. If a storm starts Wednesday night into Thursday there could be a delay of trash pickup to the following day.
Need to contact the town office?
- Phone 603-431-6710
- Fax 603-433-6198
- Great Island Common 603-436-1992 (Seasonal)
- Email Us