Walsenburg is a statutory city that is the county seat and the most populous city of Huerfano County, Colorado, United States. The city population was 3,068 at the 2010 census, down from 4,182 in 2000.Robert Ford, the assassin of outlaw Jesse James, operated a combination saloon and gambling house in Walsenburg; his home at 320 West 7th Street still stands.