Mo. Rev. Stat. § 162.830: Special district may include one or more school districts.

A special school district organized under the provisions of sections 162.670 to 162.995 may include more than one school district and may be established irrespective of county boundaries. The boundaries of a special school district organized under the provisions of sections 162.670 to 162.995 shall coincide with the boundaries of the school districts included in the special district and the special school district shall be in addition to the school districts comprising the special district.