Explore the geographies of the 384 US Core Based Statistical Areas in the interactive map below. MSAs (Metropolitan Statistical Areas) are defined by the OMB as counties that are tied (by commuting) to a core city or town with greater than 50,000 residents.

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The MSAs as of the 2020 census break down as follows:

    -  the Top 20 MSAs (in purple) account for 38% of the US population

    -  the next 200 (green)  account for 41% of the population.  THESE ARE GREENSPARC TARGET REGIONS

    -  111 Small MSAs (blue) account for 7% of the population

    -  The remaining 14% of the US population reside in small towns or rural (non-MSA) areas

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On this map, you are able to zoom in & out, as well drag the viewing area around with your mouse.

Click on any items in the Legend (lower-right) to show or hide map layers, which on this map include all three size categories of MSAs and cities.

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Click on any of the thumbnails below to go to detailed interactive maps of: Alaska, Hawaii, the Four Corners Region, and Greater Maryland (including Washington DC, Baltimore, and portions of Virginia.