Waterloo is located in Monroe County, IL. The population is 9,826, making Waterloo the largest city in Monroe County.
There are 5 public schools in Waterloo with an average Homefacts rating of A. The total crime rate for Waterloo is very low , and there are 3 registered sex offenders residing in the city. Unemployment in Waterloo is moderate and the median home sales price is $0. Detailed and up-to-date Waterloo property reports are available for any property address.
Cities near Waterloo include Floraville, Paderborn and Millstadt Township.