Mo. Rev. Stat. § 82.350

It shall be the duty of the license collector to keep a complete list of all persons, firms, associations and corporations who are required by law, or ordinance, to obtain a license, or pay a license tax, and collect all information which may be necessary for the proper assessing, levying and issuing of licenses and license taxes. Such lists and information shall be kept in proper books in the office of the license collector and at all times be kept up to date, as complete and correct as possible.