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A census tract, census area, census district or meshblock [1] is a geographic region defined for the purpose of taking a census. [2] Sometimes these coincide with the limits of cities , towns or other administrative areas [ 2 ] and several tracts commonly exist within a county.
Census Tract boundaries are available 1910–present and Block Group and Block boundaries available 1990–present. [2] The cartographic boundary files and the tabular data are formatted so as to be easily linked for use in Geographic Information System software.
The TIGER files do not contain the census demographic data, but merely the geospatial/map data. GIS can be used to merge census demographics or other data sources with the TIGER files to create maps and conduct analysis. TIGER data is available without cost because U.S. Government publications are required to be released into the public domain.
Use of GIS displays and related databases raises the potential of compromising those privacy standards, so some precautions are necessary to avoid pinpointing individuals based on spatial data. For example, data may need to be aggregated to cover larger areas such as a census tract or county, helping to mask individual identities.
As of 2022, based on the results of the 2020 Census, there are 2,487 PUMAs. PUMAs allow the Census to publish census data for sub-state areas throughout every state. For example, the ACS publishes detailed data every year, but due to their sampling procedure only publishes data for census area that have more than 65,000 People.
In developing countries, there is commonly a lack of health and demographic information at the community or population level. [5] For instance, cause of death may be unknown for deaths occurring outside of health facilities. [1] One approach to collecting such data is the cross-sectional Demographic and Health Surveys (DHS). HDSS provide a ...
Census tracts are used to establish RUCAs because they are the smallest geographic building block for which reliable commuting data are available. RUCA codes are updated every year and may be found on the website of the Economic Research Service (ERS) of the United States Department of Agriculture and the University of Washington.
The United States Census Department extensively uses Web GIS to distribute its boundary data, such as TIGER files, and demographics to the public. [ 1 ] [ 16 ] The "2020 Census Demographic Data Map Viewer" runs on an ESRI Web Map Application, and provides demographic information, such as population, race, and housing information at the state ...