The United States Office of Management and Budget (OMB) defines micropolitan and metropolitan statistical areas. Metropolitan and micropolitan statistical areas consist of one or more counties (or county-equivalents). Currently defined metropolitan and micropolitan statistical areas are based on application of the 2000 standards (which appeared in the Federal Register on December 27, 2000) to Census 2000 data, as updated by application of those standards to more recent Census Bureau population estimates. The current definition is as of December, 2006.
If specified criteria are met, adjacent metropolitan and micropolitan statistical areas, in various combinations, may become the components of a new set of areas called combined statistical areas (CSAs). Using Census Bureau data the OMB compiles lists of CSAs. The areas that combine retain their own designations as metropolitan or micropolitan statistical areas within the larger combined statistical area. There are 126 CSAs defined by OMB as of December 2006.
Note that CSAs represent multiple metropolitan or micropolitan areas that have a moderate degree of employment interchange.
- List of United States Combined Statistical Areas (CSAs)
- Human geography
- United States Census Bureau
- List of United States primary census statistical areas (PCSAs)
- Core Based Statistical Area
- Metropolitan Statistical Area
- Micropolitan Statistical Area
- United States urban area
- List of Combined Statistical Areas
- Environmental Protection Agency list of CSAs with populations
- Census Bureau population data and estimates for CSAs and metropolitan/micropolitan areas
- US Office of Management and Budget
- US Census Bureau
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