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 census, a county and city consolidated their governments, and yet other incorporated places continued to function within the county; the Census Bureau treats these entities as both counties and consolidated cities (see, “Places”). The small-area components of decennial census geography, census tracts/block numbering areas and their subdivisions (block groups and census blocks, and enumeration districts prior to the 1990 census), always observe county boundaries. States, Counties, Equivalent Entities4-19