Portsmouth, New Hampshire For the city in Hampshire , England, see Portsmouth . Portsmouth, New Hampshire City Market Square Location in Rockingham County and the state of New Hampshire . Coordinates: 43°4′32″N 70°45′38″W Coordinates : 43°4′32″N 70°45′38″W Country United States State New Hampshire County Rockingham Settled 1630 Incorporated 1653 Incorporated (city) 1849 Government • Mayor Rick Becksted • Assistant mayor Jim Splaine • City council Members Deaglan McEachern Petra Huda Esther Kennedy Cliff Lazenby John Tabor Paige Trace Peter Whelan • City manager Karen Conard Area [1] • Total 16.82 sq mi (43.57 km 2 ) • Land 15.66 sq mi (40.56 km 2 ) • Water 1.17 sq mi (3.02 km 2 ) 7.21% Elevation 20 ft (6 m) Population ( 2010 ) • Total 21,233 • Estimate (2019) [2] 21,9...
