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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.


  • Is your life disaster proof?  See what you can do to help yourself during a disaster. Go to for information.
  • To commemorate the hosting between the Town and the USS Providence, the sub committee hosted by Paul Hamblett, has purchased T-Shirts.  At $15 a piece they are a great way to show your support!  
  • GAZEBO Concert Series:    Sunday, August 28, 4pm, The Portsmouth Brassworks Quintet.  
  • Please go to "Town News" to see the report from NHDES and the Notice of Standard Maximum Contaminant Level Violations for the second quarter in the New Castle water system.
  • The Underwood Engineering "Executive Summary" is available in the news section of this front page.

  • GREEN WASTE DATES: August 20, September 10, October 15, November 19
  • OUTSIDE WATERING BAN - MANDATORY WATERING BAN. ODD DAY outdoor watering allowed between midnight an 10am.
  •  NO watering on even days outdoors!!!
  • outside watering ban until further notice. (Outside watering includes lawn and garden, car washing, and anyu other use of outside water).  Insufficient rainfall is the cause for this ban.  Notice will be given when the Ban is removed.  New Castle Select Board - Town News for full letter from the New Castle Select Board
  • Water and Sewer Commission opening as a full member - please contact Pam Cullen at town office at 603-431-6710 ext 10.

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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