The
United States Census Bureau defines rural areas as sparsely populated and far from
urban centers, which make up an estimated 3% of the land area but are home to more than 80% of the population. The
United States Office of Management and Budget defines rural areas by county; some rural areas are classified into metropolitan counties, and others are spread throughout the numerous
micropolitan statistical areas. The Census Bureau updates their definition following each decennial census. The
U.S. Department of Agriculture has four different systems for defining rural areas: Frontier and Remote (FAR) area codes, which define rural areas in four levels of increasing remoteness by
ZIP code;
Rural–Urban Commuting Areas (RUCA); Urban Influence Codes (UICs); and Rural-Urban Continuum Codes (RUCC). The
United States Department of Health and Human Services has two agencies that define rural areas. The
Health Resources and Services Administration addresses the shortcomings of the U.S. Census Bureau, the U.S. Office of Management and Budget, and RUCA definitions to produce a definition that is balanced between them. ==History==