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Total Population: Area Counties, 1900-2010

Sources: U.S. Census Bureau; Census 2000, Summary File 1, Table DP-1; generated by CCRPC staff; using American FactFinder; <http://factfinder2.census.gov>; (30 December 2015). U.S. Census Bureau; Census 2010, Summary File 1, Table P1; generated by CCRPC staff; using American FactFinder; <http://factfinder2.census.gov>; (30 December 2015). U.S. Census Bureau; 1980 Census of Population, Volume 1: Characteristics of the Population, Chapter A: Number of Inhabitants, Part 15: Illinois, PC80-1-A15, Table 2, Land Area and Population: 1930-1980. U.S. Census Bureau; Fourteenth Census of the United States; State Compendium Illinois, Table 1. – Area and Population of Counties: 1850 to 1920; <https://www.census.gov/library/publications/1924/dec/state-compendium.html>; (23 August 2018).