Population Migration Between Counties Based on Individual Income Tax Returns, 1982-1983: [United States] United States Department of the Treasury. Internal Revenue Service counties emigration immigration population migration tax exemptions tax returns NACDA.I ICPSR.I.A.4 The data in this file include for each county the number of Federal income tax returns filed and the number of exemptions claimed. Within each category, data are provided on the number of tax filers that migrated into the county, the number that migrated out of the county, and the number for which migration status was unknown. The total number of returns filed is also provided. 1992-02-16 aggregate data, and event/transaction data 8477 10.3886/ICPSR08477.v1 Individual Master File (IMF) records, which contain a record for every Form 1040, 1040A, and 1040EZ Individual Income Tax Return filed with the Internal Revenue Service United States 1981--1982 ICPSR metadata records are licensed under a Creative Commons Attribution-Noncommercial 3.0 United States License (http://creativecommons.org/licenses/by-nc/3.0/us/).