Portsmouth, New Hampshire

Portsmouth population, 2020 to 2024

Portsmouth added 947 residents from July 2020 to July 2024, a change of +4.3%. In the latest year it moved by +175. Among 13 New Hampshire places of 5,000 or more, that growth ranks 2nd; the median place changed by +1.4%. The median place of 5,000+ in New Hampshire has 22,938 people, so Portsmouth is 1.0 times that size.

Portsmouth covers 15.66 square miles of land and 1.16 of water, for 1,465 people per square mile of land. The median New Hampshire place of 5,000+ has 746, so Portsmouth is denser than the typical town.

What county Portsmouth is in

All of Portsmouth's residents live in Rockingham County, which had 322,433 residents in 2024. Portsmouth holds 7.1% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Portsmouth

1 ZIP Code Tabulation Area (ZCTA) overlaps Portsmouth by at least 10% of the ZCTA's or the city's land: 03801. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Portsmouth is

The Census internal point of Portsmouth is at 43.060600, -70.780300. Concord, the capital, is 39.5 miles WNW in a straight line. The nearest larger place is Dover, NH (33,909 people), 10.1 miles away. The nearest city of 100,000 or more is Manchester, NH, 33.9 miles away.

Daylight in Portsmouth

At 43.06° N, Portsmouth gets about 15 h 22 min of daylight around the June solstice and 9 h 00 min around the December solstice, a swing of 6 h 22 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Portsmouth

The eight nearest incorporated places of 1,000+ in New Hampshire, measured between internal points. The closest is Dover, 10.1 miles away, with 33,909 people.