Waterloo is a town in Grant and Smithfield townships, DeKalb County, Indiana, United States. The population was 2,116 at the 2020 census.
Historic houses in Waterloo
DeKalb County is a county in the U.S. state of Indiana. As of the 2020 United States Census, the population was 43,265. The county seat is Auburn.
The DeKalb County courthouse in Auburn, Indiana.