The largest city and the seat are both Plattsmouth. It borders Sarpy, Otoe, Lancaster and Saunders Counties in Nebraska; as well as Mills and Fremont Counties in Iowa.
Main highways include I-80, US-6, US-34, US-75, NE-1, NE-50 and NE-66.
Cities
Elmwood
Louisville
Plattsmouth
Weeping Water