Clinton County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 46,460. Its county seat is Clinton. Its name is in honor of the seventh Governor of New York State, DeWitt Clinton. Clinton County comprises the Clinton, Iowa Micropolitan Statistical Area, which is also included in the Davenport–Moline–Clinton, Muscatine, Iowa–Illinois Combined Statistical Area.