Mo. Rev. Stat. § 67.1974

67.1974. Expansion of district boundaries, procedure. — The boundaries of the district may be expanded by the addition of either an adjacent unincorporated or incorporated area. Upon presentation of a petition to the board signed by two percent of registered voters residing in either the unincorporated or incorporated area adjacent to the district. If the board determines that expansion is in the best interest of the current district, then the board shall give written notice to the election authority in the county in which the unincorporated or incorporated area is located to call an election. The election authority shall submit a proposition to the residents of the unincorporated or incorporated area at a municipal or state primary or general election, or at a special election called for that purpose. Such election authority shall give notice as provided in chapter 115 . The proposition shall be submitted to voters in the unincorporated or incorporated area in substantially the following manner:

If a majority of the votes cast on the proposal by the qualified voters of the unincorporated or incorporated area voting thereon are in favor of the proposal, then the order shall become effective on the first day of the second calendar quarter after the director of revenue receives notice of adoption of the tax. If the proposal receives less than the required majority, then the board shall have no power to impose the sales tax authorized pursuant to this section unless and until the board shall again have submitted another proposal to authorize the expansion of the current district and such proposal is approved by the required majority of the qualified voters of the unincorporated or incorporated area voting on such proposal.

(L. 2001 S.B. 323 & 230)