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Blocks do not cross the boundaries of any entity for which the Census Bureau tabulates data. (See Figures 12 and 13).Census Block Numbers\u2014Census blocks are numbered uniquely within the boundaries of each state,county, census tract with a 4-character census block number. The first character of the tabulation block number identifies the block group. A block number can only be unique by using the decennial census state (STATEFP<YR>), county (COUNTYFP<YR>), census tract (TRACTCE<YR>), and block(BLOCKCE<YR>)+. 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