Mo. Rev. Stat. § 49.650
1. The governing authority of each county of the first, second, or fourth classification without a charter form of government shall have the power to adopt ordinances or resolutions relating to its property, affairs, and local government for which no provision has been made in the constitution of this state or state statute regarding the following:
(6) Parks and recreation.
If any such ordinance, order, or resolution conflicts with a municipal, fire protection district, or ambulance district ordinance, the provisions of such municipality, fire protection district, or ambulance district shall prevail within the corporate boundaries of the municipality, of such municipality, fire protection district, or ambulance district. All ordinances adopted pursuant to this section shall remain effective until repealed or amended by the governing authority, except that the general assembly shall have the power to further define, broaden, limit, or otherwise regulate the power of each such county to adopt ordinances, resolutions, or regulations.
(L. 2003 H.B. 267)