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For the 1990 Census, all counties contained either census tracts or BNAs. Census 2000 was the first decade in which census tracts were defined in all counties. In addition, the Census Bureau increased the number of geographic areas whose boundaries could be used as census tract boundaries.
This number determines the first digit of all the census blocks contained within a block group. For instance, census Block Group 2 includes any block numbered 2000 to 2999. For the 2000 US Census, the United States including Puerto Rico had 211,267 block groups, each containing an average of 39 blocks.
The number of blocks in the United States, including Puerto Rico and other island areas, for the 2020 Census was 8,180,866. [1] Census blocks are grouped into block groups, which are grouped into census tracts. There are on average about 39 blocks per block group.
ZIP Code Tabulation Areas (ZCTAs) are statistical entities developed by the United States Census Bureau for tabulating summary statistics. These were introduced with the Census 2000 and continued with the 2010 Census and 5 year American Community Survey [1] datasets. They were updated again for the 2020 census.
The National Historical Geographic Information System (NHGIS) is a historical GIS project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2010. The project has created one of the largest collections in the world of statistical census information, much of ...
Kusilvak Census Area [b] 02164 Lake and Peninsula Borough [a] 02170 Matanuska-Susitna Borough [a] 02180 Nome Census Area [b] 02185 North Slope Borough [a] 02188 Northwest Arctic Borough [a] 02195 Petersburg Borough [a] [e] 02198 Prince of Wales – Hyder Census Area [b] 02220 Sitka, City and Borough of [a] [f] 02230 Skagway, Municipality of [a ...
The 2010 United States census ... The results of the 2010 census determined the number ... cited an inconsistency as an example showing a downtown census tract which ...
RUCAs are a classification scheme that use the standard Census Bureau urban area definitions in combination with commuting information to characterize all of the nation's census tracts. Census tracts are used to establish RUCAs because they are the smallest geographic building block for which reliable commuting data are available.