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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.

  • Green Waste Day, Saturdays: October 17, November 21 from 8am to 11am.  No dumping before 8am or after 11pm.

  • TRICK or TREAT - Friday, October 30 from 5 to 7:30pm1032015_94111_13.png
  • Attention residents of New Castle:  The 2015 Great Island 5k is set to run on Sunday, October 11th at 10am from the Great Island Common.  Please be advised that the race takes place on the island, and is subject to road delays from 9:45am-10:30am.  Please plan accordingly if you need to travel on/off the island by vehicle during this time-frame.  Any addition information can be found online  Thank you in advance for your cooperation.  Respectfully,  The Great Island 5k Road Race Committee.
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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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