CBSA是什么机构？

Core-Based Statistical Area (CBSA)
Population classification, introduced by the U.S. Office of Management and Budget (OMB) in 2000, consisting of the county or counties associated with at least one core of 10,000 or greater population, plus adjacent counties having a high degree of social and economic integration with the core(s) as measured by commuting ties.
Example: Core-based statistical areas are classified as Micropolitan Statistical Areas if their population is 10,000-49,999 and Metropolitan Statistical Areas if its 50,000 or more. The largest city in each metropolitan or micropolitan statistical area is designated a "principal city." Additional cities qualify if specified requirements are met concerning population size and employment.

A Core Based Statistical Area is the official term for a functional region based around an urban center of at least 10,000 people, based on standards published by the Office of Management and Budget (OMB) in 2000.