55 ILCS 5/6-23001
Any county, having less than 2,000,000 inhabitants, may levy and collect a direct annual tax not exceeding .002% of value upon all the taxable property in such county, as equalized or assessed by the Department of Revenue, sufficient to pay the cost of maintaining any historical museum which may be owned or operated by that county. The amount of annual tax may be increased to an amount not exceeding .004% of the value of all taxable property as equalized or assessed by the Department of Revenue if the proposition for such tax rate increase has been submitted to the electors of that county and approved by a majority of those voting on the question. The election authorized by this Section shall be conducted in accordance with the general election law except that it may be held only at the same time as a primary or general election at which Representatives of the General Assembly are nominated or elected. The rate of tax authorized by this Division shall not be included within any limitation of rate for general purposes as may now or hereafter be provided by statute.
55 ILCS 5/6-23001