Franklin Grove is a village in Lee County, Illinois, United States. The population was 1,021 at the 2010 census, down from 1,052 in 2000.
Franklin Grove was named for James R. Franklin, a pioneer who settled in a grove near the town site.
The Lincoln Highway Association (LHA) maintains a national tourist center in Franklin Grove, in a historic building built by Harry Isaac Lincoln, a cousin of Abraham Lincoln. The LHA is a national organization dedicated to the preservation and promotion of the Lincoln Highway, the first road across the United States of America, which was routed through Franklin Grove.
According to the 2010 census, Franklin Grove has a total area of 0.48 square miles (1.24 km2), all land.
At the 2000 census there were 1,052 people, 372 households, and 249 families in the village. The population density was 2,835.5 people per square mile (1,097.8/km²). There were 394 housing units at an average density of 1,062.0 per square mile (411.1/km²). The racial makeup of the village was 99.24% White, 0.10% African American, 0.10% Asian, 0.29% from other races, and 0.29% from two or more races. Hispanic or Latino of any race were 0.57%.
Of the 372 households 34.7% had children under the age of 18 living with them, 52.4% were married couples living together, 10.2% had a female householder with no husband present, and 32.8% were non-families. 28.8% of households were one person and 21.0% were one person aged 65 or older.