Online Directory: New Hampshire, USA
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Communities designated in blue are Members of Sister Cities International. Click on a city name to learn more about its sister city initiatives.
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| Community | Website | Sister City | Website | |
| Londonderry |  | |||
| Portsmouth | Nichinan, Miyazaki, Japan | |||
| Portsmouth | Parnu, Estonia | |||
| Portsmouth | Szolnok, Hungary | |||
| Portsmouth | Carrickfergus, Northern Ireland, UK | |||
| Portsmouth | Severodvinsk, Arkhangel'skaya, Russia | |||
| Portsmouth | Aburi, Ghana | |||
| Portsmouth | Kitase, Ghana | |||
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