West Mifflin is a city located in Pennsylvania. With a 2020 population of 19,425, it is the 28th largest city in Pennsylvania and the 1899th largest city in the United States. West Mifflin is currently declining at a rate of -0.71% annually and its population has decreased by -4.37% since the most recent census, which recorded a population of 20,313 in 2010. West Mifflin reached it's highest population of 28,070 in 1970. Spanning over 15 miles, West Mifflin has a population density of 1,367 people per square mile.
The average household income in West Mifflin is $67,750 with a poverty rate of 13.25%. The median rental costs in recent years comes to $585 per month, and the median house value is $98,800. The median age in West Mifflin is 45.2 years, 42.7 years for males, and 48.1 years for females. For every 100 females there are 92.0 males.