This report describes an expanded and revised version of the Economic Research Service's 1979 classification of nonmetro counties, commonly called the ERS typology. The classification has been widely used by researchers, policy analysts, and public officials as a source of information about the economic and social diversity characterizing rural America. The revised typology classifies counties designated as nonmetro in 1993 into one of six nonoverlapping types that indicate the county's primary economic activity: farming-dependent, mining-dependent, manufacturing-dependent, government-dependent, services-dependent, and nonspecialized. The revised typology also classifies counties according to five other overlapping types with special relevance for rural policy: retirement-destination, federal lands, commuting, persistent poverty, and transfers-dependent. This analysis focuses on the distributions of nonmetro counties across the types. Sections on each county type provide brief economic and sociodemographic profiles, including U.S. maps showing county locations, graphs tracing job growth in each county type versus national growth, and data tables. Appendices describe data sources and procedures and include 18 data tables on selected statistics by county type, including demographic characteristics, high school graduates and dropouts, income, employment, and poverty. Contains 21 references. (Author/SV)