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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.


   .    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 "Town News"
  • Green Waste Day, Saturday, August 19 from 8:00 to 11:00AM next to old rifle range to the right of the Recreation Building
  • CDC- Center for Disease Control and Prevention.  New material for the tick season, 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

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