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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: September 12, October 17, November 21 from 8am to 11am.  No dumping before 8am or after 11pm.
  • The Fire Department occasionally uses the hydrants during training and when this happens sometimes the water becomes murky and brown.  
  • Dates scheduled for flushing: Monday, August 31, from 6:30pm to 8:30pm and Monday, September 14, from 6:30pm to 8:30pm.

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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