Swisher is a city in Johnson County, Iowa, United States. It is part of the Iowa City, Iowa Metropolitan Statistical Area. The population was 91…Swisher is a city in Johnson County, Iowa, United States. It is part of the Iowa City, Iowa Metropolitan Statistical Area. The population was 914 at the time of the 2020 census. Swisher is located at 41°50′42″N 91°41′42″W / 41.84500°N 91.69500°W.