Mo. Rev. Stat. § 95.145

For the purpose of testing the sense of the voters of any incorporated city, town, or village, whether organized under the general laws of this state or by special charter or by constitutional charter, upon a proposition to incur debt as authorized in sections 95.115 to 95.135, the council, board of aldermen or trustees, as the case may be, shall order the question be submitted to the voters.