Hartford is a village in Madison County, Illinois, near the mouth of the Missouri River. The population was 1,545 at the 2000 census. Lewis and Clark spent the winter of 1803-1804 here, near what has been designated the Lewis and Clark State Historic Site.
Hartford is the birthplace of actor Clint Walker, known for the television series Cheyenne and for the movies The Ten Commandments and The Dirty Dozen.
Hartford is located at 38°49′28″N 90°5′33″W / 38.82444°N 90.0925°W / 38.82444; -90.0925 (38.824498, -90.092509).