Mo. Rev. Stat. § 67.800: Notice to nonresident property owners, when.

Before any political subdivision or special taxing district for public works or public improvements shall be formed, and before any political subdivision or special taxing district excepting school districts may impose any special assessment for public works or public improvements, a copy of any notice required to be published by general law shall be mailed to all nonresident property owners who request notice as provided herein, within ten days after the first publication of such notice.