Irwin is a city located in Pennsylvania. With a 2020 population of 3,700, it is the 268th largest city in Pennsylvania and the 5619th largest city in the United States. Irwin is currently declining at a rate of -0.91% annually and its population has decreased by -6.87% since the most recent census, which recorded a population of 3,973 in 2010. Irwin reached it's highest population of 4,995 in 1980. Spanning over 1 miles, Irwin has a population density of 4,422 people per square mile.
The average household income in Irwin is $61,834 with a poverty rate of 11.01%. The median rental costs in recent years comes to $696 per month, and the median house value is $159,100. The median age in Irwin is 44.2 years, 43 years for males, and 47.3 years for females. For every 100 females there are 89.8 males.