Marion is a city located in Linn County, Iowa, within the United States. It is situated adjacent to Cedar Rapids and is officially part of the Cedar Rapids Metropolitan Statistical Area. The city experienced significant growth over the early 21st century, with its population increasing by 58% between the 2000 census and the 2020 census.
Historically, Marion served as the first seat of Linn County before the designation was moved to Cedar Rapids in 1919. Today, the city functions primarily as a suburban community characterized by a historic downtown center. It is recognized as one of the fastest-growing cities in the state of Iowa.