When a state has disqualified a person from voting because that person has been convicted of a crime, the procedures for that person to regain the right to vote are governed by state law. As a result, the best source of reliable information is the appropriate state office. Listed below are the websites for those states or territories that have posted either specific information regarding the process by which an individual can have his or her rights restored or general voter registration information.
District of Columbia:
http://www.elections.il.gov/DocDisplay.aspx?Doc=Downloads/ElectionInformation/PDF/registervote.pdf&Title=Registering to Vote in Illinois