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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.

        Notices:

  • April 14, 2018 (Saturday) Road Race on 1B starting at 9am
  • April 15, 2018 (Sunday) Road March on 1B between the hours of 9:30am - 2:00pm
  • Maude H. Trefethen Elementary School update by David W. Latchaw, Principal.
  • For power information, go to www.eversource.com, Residential, Outages: multiple choices to view. Sign up for an account while your in the website.
  • Click here for the most recent Water Study Report (December 11, 2017) and read about "Steps We Are Taking". The December 11, 2017 report can also be viewed Open to New Castle Residents. Forms available in town office. Please visit Rye Recreation.


Need to contact the town office?
  • Phone 603-431-6710
  • Fax 603-433-6198
  • Great Island Common 603-436-1992 (Seasonal)
  • Email Us


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