Investopedia explains 'ABCD Counties'
A counties are classified as any county located in the 25 largest U.S. metropolitan areas, which will be the highest density. B counties are considered any county that is not an A county and has a population exceeding 150,000 or is part of a metropolitan area with a population over 150,000. C counties are seen as any county that is not classified as an A or B county, and has a population between 40,000 and 150,000. D counties are any county that not classified as an A, B or C county.
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