what county is deer grove, il in?
Deer Grove is a village in Whiteside County, Illinois, United States. The population was given as 45 in the 2010 census, down from 48 in 2000. Deer Grove is located at 41Â°36â²28â³N 89Â°41â²30â³Wï»¿ / ï»¿41.60778Â°N 89.69167Â°Wï»¿ / 41.60778; -89.69167 (41.607822, -89.691534).