Springfield is a small city in central Illinois with a population of 113,000. It is also the capital city of the State of Illinois. It was the primary residence of Abraham and May Todd Lincoln, whose home is preserved and open to the public as the Lincoln Home National Historic Site, as is Lincoln-Herndon Law Offices State Historic Site, the Lincoln Tomb State Historic Site, and the Old State Capitol State Historic Site. The Abraham Lincoln Presidential Library and Museum interprets the life and times of our sixteenth president.