NASA Socioeconomic Data and Applications Center (SEDAC) – Hosted by CIESIN at Columbia University

U.S. Census Grids

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Summary File 3, v1 (1990)

Data are available at a resolution of 30 arc-seconds or approximately 1 kilometer for the continental United States, as well as for individual states and the District of Columbia.  Summary File 1 (SF1) data are derived from the Census short form and are based on a full count of the population.