About Poplar Grove, Illinois
Coordinates: 42°20?45?N 88°50?22?W? / ?42.34583°N 88.83944°W? / 42.34583; -88.83944Poplar Grove is a village located in Poplar Grove and Belvidere Townships, Boone County, Illinois, United States. It is part of the Rockford Metropolitan Statistical Area. The population was 5,023 at the 2010 census, up significantly from 1,368 at the 2000 census.