St. Francis is a city in northeastern Clay County, Arkansas, United States, along the St. Francis River. The population was 250 at the 2010 census. The St. Francis area was settled in the 1840s, with the early residents forming the Chalk Bluff community just northwest of the present city. The Battle of Chalk Bluff was fought here in May 1863, during the Civil War. In 1882, the St. Louis Southwestern Railway was constructed through the area, and the Chalk Bluff community gradually shifted southeastward to a location along the railroad tracks. This new community was named "St. Francis" after the adjacent river.