The governing body of any city or county may establish and maintain public library service for the use of its inhabitants. By ordinance or resolution it may set apart for the benefit thereof any public property of the city or county. In any statutory city and in any city of the second, third, or fourth class, and in any county, the governing body may levy an annual tax on all taxable property therein except counties may not tax property which is already taxed for public library service. The proceeds of the tax shall be known as the library fund.