What is Combined Statistical Area?
'''Combined statistical area''' ('''CSA''') is a term for a combination of nearby [[metropolitan statistical area|metropolitan]] (MSA) and [[micropolitan statistical area]]s (µSA) across the 50 [[US]] states and the territory of [[Puerto Rico]] that can demonstrate economic or social links. The OMB defines a CSA as consisting of various combinations of adjacent metropolitan and micropolitan areas with economic ties measured by commuting patterns. These areas that combine retain their own designations as metropolitan or micropolitan statistical areas within the larger combined statistical area. [[File:Combined Statistical Areas (CSAs) of the United States and Puerto Rico, Mar 2020.png|thumb|An map of the 175 combined statistical areas (CSAs) of the [[United States]] (172) and [[Puerto Rico]] (3) as of 2020]] {{authority control}} [[Category:Geography of the United States]] {{US-geo-stub}}