South Portland, ME Profile: Facts, Map & Data


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South Portland, Maine - Basic Facts

The City of South Portland is the 4th largest city in Maine with a population of 25,929 as of July 1, 2017. South Portland ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Maine. See peer rankings below.

The primary coordinate point for South Portland is located at latitude 43.6314 and longitude -70.286 in Cumberland County. The formal boundaries for the City of South Portland (see map below) encompass a land area of 12.04 sq. miles and a water area of 1.97 sq. miles. Cumberland County is in the Eastern time zone (GMT -5). The elevation is 23 feet.

The City of South Portland (GNIS ID: 582738) 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 South Portland population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of South Portland, ME Boundary Map

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South Portland, ME Data & Demographics (As of July 1, 2017)


Total Population 25,929
Daytime Population: Workers 23,391
Daytime Population: Residents 10,970
Total Daytime Population (TDP) 34,361
Ratio TDP/Total Population1 1.33
Population in Households 25,295
Population in Familes 18,005
Population in Group Qrtrs 634
Population Density2 2,153
Diversity Index3 24


Median Household Income $57,529
Average Household Income $74,229
Per Capita Income $32,711


Total Housing Units 11,936 (100%)
Owner Occupied HU 6,564 (55.0%)
Renter Occupied HU 4,720 (39.5%)
Vacant Housing Units 652 ( 5.5%)
Median Home Value $235,578
Average Home Value $272,342


Total Households 11,284
Average Household Size 2.24
Family Households 6,309
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 0.5% 0.55%
Households 0.51% 0.56%
Families 0.25% 0.39%
Median Household Income   3.27%
Per Capita Income   3.23%

South Portland, ME - Peer Comparisons by Rank and Percentile

The table below compares South Portland to the other 130 incorporated cities, towns and CDPs in Maine 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 # 4 98th
Population Density # 2 99th
Diversity Index # 7 95th
Median Household Income # 30 78th
Per Capita Income # 26 81st

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

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