West Mifflin, PA Profile: Facts & Data


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West Mifflin, Pennsylvania - Basic Facts

The Borough of West Mifflin had a population of 19,762 as of July 1, 2020. West Mifflin ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Pennsylvania. See peer rankings below.

The primary coordinate point for West Mifflin is located at latitude 40.3634 and longitude -79.8664 in Allegheny County. The formal boundaries for the Borough of West Mifflin encompass a land area of 14.21 sq. miles and a water area of 0.29 sq. miles. Allegheny County is in the Eastern time zone (GMT -5). The elevation is 1,089 feet.

The Borough of West Mifflin (GNIS ID: 1214837) 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.


West Mifflin, PA Data & Demographics (As of July 1, 2020)


Total Population 19,762 (100%)
Population in Households 19,674 (99.6%)
Population in Families 15,638 (79.1%)
Population in Group Quarters1 88 ( 0.4%)
Population Density 1,391
Diversity Index2 29


Median Household Income $55,147
Average Household Income $69,794
% of Income for Mortgage4 8%
Per Capita Income $30,774
Wealth Index5 74


Total HU (Housing Units) 9,502 (100%)
Owner Occupied HU 6,688 (70.4%)
Renter Occupied HU 2,024 (21.3%)
Vacant Housing Units 790 ( 8.3%)
Median Home Value $104,463
Average Home Value $137,407
Housing Affordability Index3 221


Total Households 8,712
Average Household Size 2.26
Family Households 5,514
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population -0.27% -0.26%
Households -0.1% -0.18%
Families -0.26% -0.26%
Median Household Income   1.17%
Per Capita Income   1.48%
Owner Occupied HU   -0.18%


West Mifflin, PA - Peer Comparisons by Rank and Percentile

The table below compares West Mifflin to the other 1,761 incorporated cities, towns and CDPs in Pennsylvania by rank and percentile using July 1, 2020 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 # 33 98th
Population Density # 888 50th
Median Household Income # 873 50th
Housing Affordability Index # 1097 62nd
Per Capita Income # 666 62nd
Diversity Index # 399 77th

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

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