In December, 2010, Congress passed Public Law 111-314, which authorizes the addition of Title 51 to the United States Code. Title 51 is entitled “National and Commercial Space Programs,” and it is comprised of existing provisions of the United States Code related to that topic. The House Law Revision Counsel, the group that maintains the United States Code, has drafted plans for additional new titles: 52 (Voting and Elections); 53 (Small Business); 54 (National Park System); and 55 (Environment), which you can see here. While PL 111-314 is not currently available on FDSys.gov, Thomas has a link to the House Report and status of the underlying bills here.
United States Code Title 51