Combined Statistical Area (CSA)
Overview
Combined Statistical Area (CSA) is a U.S. geographic area defined by the Office of Management and Budget that consists of two or more adjacent Core-Based Statistical Areas with substantial employment interchange. CSAs represent larger regional economic areas and labor markets.
Key Concepts
Employment interchange is the measure of commuting between adjacent CBSAs that determines CSA membership. Commuting threshold is the 15% minimum employment interchange required for combination. Component CBSAs are the metropolitan and micropolitan areas that make up a CSA. Principal city is the largest city in each component CBSA.
Examples
| CSA | Population | Components |
|---|---|---|
| New York-Newark | ~23M | NYC Metro, Bridgeport, Trenton, etc. |
| Los Angeles-Long Beach | ~18M | LA Metro, Riverside, Oxnard |
| Chicago-Naperville | ~10M | Chicago Metro, Gary, Kankakee |
Appendix
Created: 2025-12-13 | Modified: 2025-12-13
See Also
- Core-Based Statistical Area (CBSA)
- Metropolitan Statistical Area (MSA)
- Office of Management and Budget (OMB)