Mo. Rev. Stat. § 135.257: Enterprise zone to be established in city not within a county (St. Louis).

In addition to the number of enterprise zones authorized pursuant to the provisions of sections 135.206, 135.208, 135.210 and 135.256, the department of economic development shall designate one such zone in any city not within a county if such area which is to be included in the enterprise zone meets all the requirements of section 135.205.