Chapter 11 Census Blocks and Block Groups

Census Blocks , the smallest geographic area for which the bureau of the Census collects and tabulates decennial Census data , are formed by streets, roads, railroads, streams and other bodies of water, other visible physical and cultural features, and the legal boundaries shown on Census bureau maps. Census data for these areas serve as a valu-able source for small-area geographic studies. The Census bureau hasresponded to public demand for more geographic coverage of Census Block data by expanding the Census Block Statistics Program each dec- ade since Block data first were published in 1940. For the 1990 decen-nial Census , the Census bureau tabulated data by Census Block for the entire Nation, as well as Puerto Rico and the Outlying Areas (Ameri-can Samoa, Guam, the Northern Mariana Islands, Palau, and the Virgin Islands of the United States).

census data by block long before the Census Bureau was able to undertake such detailed geographic subdivision. For instance, in 1909, the Tenement House Department of New York city had wanted the Census Bureau to identify more than 49,000 city blocks as part of the data dissemination for the 1910 census.

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