Mo. Rev. Stat. § 71.280
Current with changes from the 2023 Legislative Session
The provisions of section 71.270 shall not apply to any state or county road established and opened prior to the filing of the plat of a subdivision; but such road, when marked on the plat, may be vacated by the county commission when it shall no longer be used and maintained as a state or county road, and the same, when vacated, shall vest in the person who may have the legal title thereof.
§ 71.280, RSMo
RSMo 1939 § 7321