Combined statistical area

The primary distinguishing factor between a CSA and an MSA/μSA is that the social and economic ties between the individual MSAs/μSAs within a CSA are at lower levels than those between the counties within an MSA. CSAs represent multiple metropolitan or micropolitan areas that have an employment interchange of at least 15% (% commuting from A to B plus % commuting from B to A). CSAs often represent regions with overlapping labor and media markets.

As of 2023, there are 184 combined statistical areas across the United States, including three in the territory of Puerto Rico.

United States

This table lists the 181 combined statistical areas (CSAs) of the United States with the following information:

1. The CSA rank by population as of July 1, 2025, as estimated by the U.S. Census Bureau
2. The CSA name as designated by the United States Office of Management and Budget
3. The CSA population as of July 1, 2025, as estimated by the United States Census Bureau
4. The CSA population as of April 1, 2020, as enumerated by the 2020 United States census
5. The percent CSA population change from April 1, 2020, to July 1, 2025
6. The core-based statistical areas (CBSAs) that constitute the CSA

Metropolitan statistical areas that are not also combined with other MSAs or CBSAs are not listed below.