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Q:  

What are the sizes of the geographic units for the 2006 ACS and how are they determined?

A:  

The 2006 ACS includes all states, 783 counties, 504 places (cities, towns, and Census designated places), 922 school districts, 499 metropolitan and micropolitan areas, 14 American Indian and Alaska Native areas, and 2,068 public use microdata areas (PUMAs).

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