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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.


  • REMINDERS:
  • 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 under the "Town News" section of our website.
  • TOWN HALL CLOSING EARLY TODAY FOR EMPLOYEE CHRISTMAS PARTY.  OFFICES WILL BE CLOSED FROM 12:30 UNTIL 2:30PM.
  •  CHRISTMAS TREE LIGHTING - Wednesday, December 13 at 5pm at the Gazebo.  Everyone invited. 1272017_24606_0.png

  • The Underwood Engineering"Executive Summary - Sewer" is available in the news section of this front page
  • PROGRAMS:
  • Winter Programs for Rye Recreation - Open to New Castle Residents. Forms available in town office.

  • Questions and solutions for food safety, gardening, pets and backyard problems: http://extension.unh.edu/Gardens-Landscapes/Education-Center-Information-Line

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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