High Quality Content by WIKIPEDIA articles! The United States Office of Management and Budget (OMB) has defined 125 Combined Statistical Areas (CSAs) for the United States of America. The OMB defines a Combined Statistical Area as an aggregate of adjacent Core Based Statistical Areas (CBSAs) that are linked by commuting ties.The Combined Statistical Area is the most expansive of the metropolitan area concepts employed by the OMB. The population of a Combined Statistical Area is greater than any of... Mehr