Mo. Rev. Stat. § 67.664

If a county, municipality or other political subdivision imposes a local sales tax or a local gross receipts tax for the purpose of promoting tourism under any other statutory or charter authorization, such county, municipality or other political subdivision shall not impose any tax authorized pursuant to the provisions of section 67.1000, 67.1150, 67.1170, 67.1177, 67.1360, 67.1362 or 67.1364, or section 94.870. No city or county which is within an area within which a tax is imposed pursuant to section 67.601 to 67.626, shall itself impose any tax which is authorized under any of the provisions of sections 67.1000, 67.1150, 67.1170, 67.1177, 67.1360, 67.1362 or 67.1364.