Mo. Rev. Stat. § 407.489

Notwithstanding any provision of section 89.020 to the contrary, the legislative body of all cities, towns, and villages is hereby prohibited from passing any zoning law, ordinance, or code that would prevent any entity organized pursuant to Section 501(c)(3) or Section 501(c)(19) of the Internal Revenue Code that owns or operates a retail business engaged in the practice of reselling donated goods from operating a business establishment within any area where any other business engaged in retail sales is permitted to operate; provided that at least eighty percent of all revenue generated by such entity is used to fund the charitable purpose of the organization.