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 21,542 as of July 1, 2016. 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, 2016.

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

Neighborhood Data

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City of Portsmouth, NH Boundary Map

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Portsmouth, NH Data & Demographics (As of July 1, 2016)


Total Population 21,542
Population in Households 20,658
Population in Familes 13,075
Population in Group Qrtrs 884
Population Density1 1,378
Diversity Index2 29


Total Households 10,277
Average Household Size 2.01
Family Households 4,780
Average Family Size 3


Total Housing Units 10,954 (100%)
Owner Occupied HU 4,924 (45.0%)
Renter Occupied HU 5,353 (48.9%)
Vacant Housing Units 677 ( 6.2%)
Median Home Value $354,617
Average Home Value $398,583


Median Household Income $60,991
Average Household Income $86,162
Per Capita Income $42,152
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.58% 0.35%
Households 0.42% 0.48%
Families 0.15% 0.3%
Median Household Income   1.57%
Per Capita Income   1.76%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

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, 2016 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 Density1 # 18 82nd
Diversity Index2 # 5 96th
Median Household Income # 28 72nd
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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