Marion is a city located in Linn County Iowa. With a 2020 population of 41,137, it is the 13th largest city in Iowa and the 949th largest city in the United States . Marion is currently growing at a rate of 0.95% annually and its population has increased by 18.32% since the most recent census, which recorded a population of 34,768 in 2010. Marion reached it's highest population of 41,137 in 2021. Spanning over 18 miles, Marion has a population density of 2,322 people per square mile.
The average household income in Marion is $90,471 with a poverty rate of 7.88%. The median rental costs in recent years comes to $725 per month, and the median house value is $168,700. The median age in Marion is 38.7 years, 37.9 years for males, and 39.8 years for females.