Poplar Grove (founded in 1859) is a village located in Poplar Grove and Belvidere Townships, Boone County, Illinois, United States. It is part of the Rockford Metropolitan Statistical Area, and of the gated community Candlewick Lake. The population was 5,023 at the 2010 census, up from 1,368 in 2000.
According to the 2010 census, Poplar Grove has a total area of 8.05 square miles (20.85 km), of which 8.03 square miles (20.80 km) (or 99.75%) is land and 0.02 square miles (0.05 km) (or 0.25%) is water.
As of the 2010 U.S. census, there were 5,023 people, 653 households, and 670 families residing in the Town. The population density was 304.4 people per square mile (117.6/km²). There were 479 housing units at an average density of 106.6 per square mile (41.2/km²). The racial makeup of the village was 98.46% White, 0.22% Native American, 0.07% Asian, 1.02% from other races, and 0.22% from two or more races. Hispanic or Latino of any race were 1.83% of the population.
There were 653 households, out of which 45.9% had children under the age of 18 living with them, 69.3% were married couples living together, 8.2% had a female householder with no husband present, and 18.3% were non-families. 13.5% of all households were made up of individuals and 6.4% had someone living alone who was 65 years of age or older. The average household size was 3.02 and the average family size was 3.30.
In the town, the population was spread out with 33.5% under the age of 18, 7.4% from 18 to 24, 29.8% from 25 to 44, 21.3% from 45 to 64, and 8.1% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 104.8 males. For every 100 females age 18 and over, there were 100.9 males.
The median income for a household in the village was $56,375, and the median income for a family was $60,800. Males had a median income of $43,125 versus $25,982 for females. The per capital income for the village was $20,493. About 3.5% of families and 4.2% of the population were below the poverty line, including 5.4% of those under age 18 and 2.8% of those age 65 or over.