PLATTSMOUTH

city, seat (1855) of Cass county, eastern Nebraska, U.S., near the confluence of the Platte and Missouri rivers. Founded in 1854, it developed as a trading post, stagecoach stop, and terminus and shipping point for farmers. With the arrival of the Burlington and Missouri River Railroad in 1869, river traffic declined. After 1940 Plattsmouth evolved into a commuter suburb of Omaha but retained some industries, the largest being the manufacture of freight cars. The King Korn Karnival, a harvest fair, is held each September. Inc. 1855. Pop. (1990) 6,412.