In addition to the number of enterprise zones authorized pursuant to the provisions of sections 135.206, 135.210, 135.256 and 135.257, the department of economic development shall designate one such zone for any county of the third classification without a township form of government with a population of less than eighteen thousand and more than seventeen thousand nine hundred. Such enterprise zone designation shall only be made if such area which is to be included in the enterprise zone meets all the requirements of section 135.205.