Not all states recognize common law marriage. Please check with your state law. Some states recognize common law marriages only for the purpose of inheritance while some do not recognize common law marriage that took place after a certain date.
States that recognize common law marriages
Utah, Texas, South Carolina, Rhode Island, Oklahoma, Montana, Kansas, Iowa, Washington DC, Colorado, Alabama, New Hampshire (only for the purpose of inheritance), Georgia (marriages prior to January 1, 1997), Idaho (marriages prior to January 1, 1996), Ohio (marriages prior to October 10, 1991) and Pennsylvania (marriages prior to January 1, 2005).
The following states do not recognize common law marriages