Portsmouth is a city in Rockingham County, New Hampshire in the United States. It is the largest city but only the fourth-largest community in the county, with a population of 21,233 at the 2010 census.United States Census Bureau, American FactFinder, 2010 Census figures. Retrieved April 1, 2011. A historic seaport and popular summer tourist destination, Portsmouth is served by Portsmouth International Airport at Pease, formerly the Strategic Air Command's Pease Air Force Base.

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