9 states ratified using the consitution By ezarr Dec 1, 1787 Delaware 1 December 7, 1787 Dec 3, 1787 New Jersey 3 December 18, 1787 Dec 12, 1787 Pennsylavannia December 12, 1787 Jan 4, 1788 Georgia January 2, 1788 Jan 9, 1788 Connecticut January 9, 1788 Feb 6, 1788 Massachusetts February 6, 1788 Apr 28, 1788 Maryland April 28, 1788 May 23, 1788 South Carolina May 23, 1788 Jun 21, 1788 New Hampshire June 21, 1788