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County
Census Block Groups by Population Density (2012 ACS)
Montgomery County of Maryland —
U.S. Census Block Groups represents the U.S. Census block groups of the United States in the 50 states, the District of Columbia, and Puerto Rico. -
County
Allegheny County Census Block Groups 2016
Allegheny County / City of Pittsburgh / Western PA Regional Data Center —
This is an Allegheny County extract of the 2016 US Census Block Groups downloaded from the following website: https://www.census.gov/geo/maps-data/data/tiger-cart-...