With the release of the 2014 benchmark in March 2015, CES State and Area estimates will begin using 2013 statistical area definitions from the Office of Management and Budget (OMB).
CES State and Area estimates are currently based on the 2009 area definitions as outlined in OMB Bulletin No. 10-02. Estimates will be based on the new 2013 definitions outlined in OMB Bulletin 13-01 beginning with the release of the 2014 benchmark data in March 2015.
Details about the area definitions currently used
OMB Bulletin 10-02
OMB Bulletin 13-01
Last Modified Date: February 6, 2014