1948:  The assessment dollar values are based on the state level of $22,386,013,000 less 5 percent for state assessed value (Report of the Commission on Revenue of the State of Illinois. 1963. Chapter XII General Property Tax by H. K. Allen, Table 3, p. 456) prorated to county levels based upon the 1956 data. Aggregate assessment sales price ratios are only provided at the state level of 0.632 (Report of the Commission on Revenue of the State of Illinois. 1963. Chapter XIV State Equalization of Local Assessments by H. K. Allen, p. 516.

 

1956:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1957, Advance Releases, Real Estate Assessments in the United States, Table 4 - Taxable Assessed Values Subject to Local Property Taxation, By Class of Property, By States and Counties: 1956, pp. 19-20. Aggregate assessment sales price ratios are only provided at the state level by residential (0.409), commercial (0.445), vacant (0.367), farm (0.422) ratios, pp. 6-13. The average ratio of 0.411 is used.

 

1961:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1962, Governmental Organization, Table 21. - Assessed Value of Property Subject to Local Property Taxation, By Class of Property, for States, Counties, and Selected Major Cities: 1961, pp. 108-109, Table 22. - Statistics on Real Property Assessments and on Measurable Sales, 1961, pp. 142-143U.S. Govt. Printing Office, Wash DC, 1963. 

 

1967:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1966, Taxable Property Values, Governmental Organization, Table 18 - Assessed Value of Property Subject to Local Property Taxation, By Class of Property,For States, Counties, and Selected Major Cities: 1966, pp. 88-89, Table 19. Statistics on Real Property Assessments and on Measurable Sales, pp. 128-129. U.S. Govt. Printing Office, Wash DC, 1968 

 

1972:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1972, V. 2, Taxable Property Values and Assessment-Sales Price Ratios, Table 11. Statistics on Real Property Assessments and Measurable Sales, U.S. Govt. Printing Office, Wash DC, 1974, pp. 70-71. 

 

1977:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1977, V. 2, Taxable Property Values and Assessment/Sales Price Ratios, Table 19. Statistics on Real Property Assessments and Measurable Sales, U.S. Govt. Printing Office, Wash DC, 1979, p. 178. Note that Illinois changed from 50% assessment level to 33 1/3% in 1975 per 1977 Census of Governments, V. 2, p. 12.   

 

1982:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1982, V. 2, Taxable Property Values and Assessment/Sales Price Ratios, Table 20. Assessed Value of Property Subject to Local General Property Taxation for SMSA's, Counties and Selected Major Cities and Multi-State SMSA's, Table 21. Statistics on Real Property Assessments and Measurable Sales, U.S. Govt. Printing Office, Wash DC, 1979, p. 65, p. 139. 

 

1986:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1986, V. 2, Taxable Property Values, Use Categories by States: 1986, Gross Assessed Value, U.S. Govt. Printing Office, Wash DC, 1988, p. 97 

 

1992:  U.S. Dept. of Commerce, Bureau of the Census, Census of Governments 1992, V. 2, Taxable Property Values, Assessed Value of Property Subject to Local General Property Taxation for County Areas and Selected Major Cities by State - 1991. Gross Assessed Value, U.S. Govt. Printing Office, Wash DC, 1994. p. 17. 

 

1997: Illinois Economic and Fiscal Commission, 2001, Property Taxes in Illinois, January 2001 Update, Appendix 2, Percentage Share of Each County's 1997 Equalized Assessed Valuation By Class of Property (After Exemptions). Note that Cook 1997 assessed figure is already equalized.