Iowa City is the largest city in Johnson County, Iowa, and serves as its county seat. It is the fifth-most populous city in the state of Iowa, with a recorded population of 74,828 according to the 2020 census.
The city is part of the Iowa City metropolitan area, which includes Johnson and Washington counties and has a population exceeding 171,000. This metro area is also integrated into the larger Iowa City–Cedar Rapids region, a combined statistical area with a total population of nearly 500,000.