Caledonia is a village in Winnebago County and Boone County, Illinois, United States. It is part of the Rockford, Illinois Metropolitan Statistical Area. The population was 197 at the 2010 census, down from 199 at the 2000 census.
Caledonia is located at 42°22?04?N 88°53?33?W / 42.36778°N 88.8925°W / 42.36778; -88.8925 (42.367850, -88.892538).
According to the United States Census Bureau, the village has a total area of 0.5 square miles (1.4 km²), all of it land.