10.3886/ICPSR08139.v2 United States Department of the Treasury. Internal Revenue Service Inter-university Consortium for Political and Social Research 1984 counties federal income tax income place of residence population migration tax exemptions tax returns United States 1984-07-12 2010-09-27 administrative records data 8139 2 This data collection was prepared by the Internal Revenue Service to facilitate the analysis of migration patterns of Americans within the United States by tracing the origins of their tax returns in 1980 and 1982. Their county of residence is documented in both years. Part 1 shows the number of returns and the number of exemptions in each county in the country, and Part 2 shows the aggregate adjusted gross income for each county. Part 1 has data for all returns in 1979, both for nonmigrants and those who had moved out of the county, and for 1981, also for nonmigrants and those who had moved into the county. It also provides data for all exemptions, in order to approximate the number of movers and nonmovers in the two years (1979 and 1981).