What are MSA, PMSA, and CBSA?

A. MSA is the older standard used by the government to define certain populous geographic areas. There are 280 MSA's.

MSAs and PMSAs are four-digit numeric codes assigned to the 362 metropolitan geographic areas defined by the Office of Management and Budget (OMB), a part of the administrative branch of the Federal Government. The MSA and PMSA standard have been replaced by the CBSA (Core Based Statistical Area). There are 369 Metro CBSA's and 565 Micro CBSA's.

To qualify as a Metro area, the population must exceed 50,000. A Micro area has 10,000 to 50,000. More.

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