Portsmouth, NH Profile: Facts, Map & Data


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Portsmouth, New Hampshire - Basic Facts

The City of Portsmouth is the 8th largest city in New Hampshire with a population of 21,752 as of July 1, 2017. Portsmouth ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in New Hampshire. See peer rankings below.

The primary coordinate point for Portsmouth is located at latitude 43.0606 and longitude -70.7803 in Rockingham County. The formal boundaries for the City of Portsmouth (see map below) encompass a land area of 15.64 sq. miles and a water area of 1.21 sq. miles. Rockingham County is in the Eastern time zone (GMT -5). The elevation is 20 feet.

The City of Portsmouth (GNIS ID: 873703) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Beneath the boundary map are tables with Portsmouth population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Portsmouth: Pascataquack, Piscataqua, Rivertown, Strabery Banke, Strawberry Banck, Strawberry Bancke, Strawberry Bank, Strawberry-bank, Strawbery Banke, The Bank.

EXTREMELY LOCAL Demographic Data

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City of Portsmouth, NH Boundary Map

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Portsmouth, NH Data & Demographics (As of July 1, 2017)


Total Population 21,752
Daytime Population: Workers 31,975
Daytime Population: Residents 8,313
Total Daytime Population (TDP) 40,288
Ratio TDP/Total Population1 1.85
Population in Households 20,853
Population in Familes 13,174
Population in Group Qrtrs 899
Population Density2 1,391
Diversity Index3 30


Median Household Income $65,508
Average Household Income $90,535
Per Capita Income $44,099


Total Housing Units 11,087 (100%)
Owner Occupied HU 5,007 (45.2%)
Renter Occupied HU 5,335 (48.1%)
Vacant Housing Units 745 ( 6.7%)
Median Home Value $355,058
Average Home Value $398,971


Total Households 10,342
Average Household Size 2.02
Family Households 4,785
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.63% 0.4%
Households 0.45% 0.51%
Families 0.14% 0.31%
Median Household Income   3.37%
Per Capita Income   3.33%

Portsmouth, NH - Peer Comparisons by Rank and Percentile

The table below compares Portsmouth to the other 97 incorporated cities, towns and CDPs in New Hampshire by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 8 93rd
Population Density # 18 82nd
Diversity Index # 5 96th
Median Household Income # 26 74th
Per Capita Income # 7 94th

Additional comparisons and rankings can be made with a VERY EASY TO USE New Hampshire Census Data Comparison Tool.

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