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The CARR (Community assets and relative rurality index) index is a continuous, multidimensional measure of rurality based on the concept of sustainable development that integrates measures of environmental, social, and economic resources. The index incorporates traditional rurality measures such as population density, distance from metropolitan areas, and developed area with measures of availability and accessibility of 70 different infrastructure types that support essential community services and community amenities. The index uses data last updated in 2019 and is available for census block-groups in the coterminous United States.