Election Authority Services Board of Equalization FAQs Contact Employment	County Clerk's Services: Incorporation of Cities The County Clerk's Office has a file on each municipality that has incorporated in the County of Jefferson. If you wish to review these files, contact the County Clerk's Office or stop in and visit. The following shows the date of the municipalities incorporation and their classification: City Arnold Byrnes Mill Cedar Hill Lakes Crystal City DeSoto Festus Herculaneum Hillsboro Kimmswick Olympian Village Parkdale Pevely Scotsdale Date Incorporated 11-30-1971 08-21-1986 08-13-1973 04-03-1911 02-12-1869 02-08-1887 07-22-1819 05-05-1873 02-23-1871 09-02-1965 10-29-1959 02-08-1910 12-14-1961 Class Third Fourth Village Third Third Third Fourth Fourth Fourth Fourth Village Fourth Town Copyright © 1999-2000 Jefferson County, Missouri All rights reserved.