Falls City is a city and county seat of Richardson County, Nebraska, United States. The population was 4,325 at the 2010 census, down from 4,671 in 2000.
Falls City was founded in the summer of 1857 by James Lane, John Burbank, J.E. Burbank, and Isaac L. Hamby. The town is located on the north side of the Big Nemaha River, in the southeast corner of the state. The river in 1857 had banks and bed of rock and stone. The town was located near where the river flowed over a four-foot (1.3 m) rock ledge called the "Falls of Nemaha", for which the town was named. Over time the river has changed to the extent that the falls no longer exist.
The town was a stop on the Underground Railroad for escaping slaves during the struggles resulting from the Kansas–Nebraska Act. Early in the city's history, it won a prolonged process to become the county seat of Richardson County. The county originally selected Salem, Nebraska to be the county seat, but due to Salem's lack of a suitable building site, a new election was held which Falls City tied in the vote.