Portsmouth is a city in Rockingham County in the U.S. state of New Hampshire. It has an approximate population of 21,233 inhabitants. The population density is 524 people per square kilometer.
The postal code of Portsmouth is 00210, with area code: 603.


Portsmouth’s time zone is Eastern Daylight Time (EDT). It is now 23:51 hours there.
The over all area of Portsmouth is 43.60 square kilometers of which 40.50 square kilometers is land and 7.21 square km is water. The height in meters of Portsmouth is 6.00 meters.
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