Some of the cities, towns, and places in Cass County are Alvo, Avoca, Cedar Creek, City of Louisville, City of Plattsmouth, Eagle, Elmwood, Factoryville, Greenwood, Louisville, Manley, Murdock, Murray, Mynard, Nehawka, Plattsmouth, Rock Bluff, South Bend, Union, Wabash, Weeping Water, Weeping Water (City)
Cass County is a county in the U.S. state of Nebraska. As of the 2010 United States Census, the population was 25,241. Its county seat and largest city is Plattsmouth. The county was formed in 1855, and was named for General Lewis Cass.Cass County is included in the Omaha-Council Bluffs, NE-IA Metropolitan Statistical Area.In the Nebraska license plate system, Cass County is represented by the prefix 20 (it had the 20th-largest number of vehicles registered in the county when the license plate system was established in 1922).