Missouri constitution
Article X: taxation
Section 11(b)

For municipalities—one dollar on the hundred dollars assessed valuation;
For counties—thirty-five cents on the hundred dollars assessed valuation in counties having three hundred million dollars, or more, assessed valuation and having by operation of law attained the classification of a county of the first class; and fifty cents on the hundred dollars assessed valuation in all other counties;
For school districts formed of cities and towns, including the school district of the city of St. Louis—two dollars and seventy-five cents on the hundred dollars assessed valuation;
For all other school districts—sixty-five cents on the hundred dollars assessed valuation.