Cass County is a county in the U.S. state of Nebraska. As of the 2020 United States Census, the population was 26,598. Its county seat and largest city is Plattsmouth. The county was formed in 1855, and was named for General Lewis Cass, an American military officer, politician, and statesman.
Cass County Courthouse in Plattsmouth
Plattsmouth is a city and county seat of Cass County, Nebraska, United States. The population was 6,620 at the 2020 census.
The Plattsmouth Main Street Historic District is listed in the National Register of Historic Places. At upper right is the clock tower of the Cass County Courthouse.
Plattsmouth bridges on June 22, 2011, during the 2011 Missouri River floods