St. Francisville or Saint Francisville is a city in Lawrence County, Illinois, United States. The population was 697 at the 2010 census. St. Franc…St. Francisville or Saint Francisville is a city in Lawrence County, Illinois, United States. The population was 697 at the 2010 census. St. Francisville is rooted in a stockade built by Joseph Tougas in the early 1810s. The city was platted by Tougas's widow in the mid-1830s. It was named for St. Francis Xavier, reflecting the growing influence of Jesuit missionaries in the area. The city incorporated in 1873.