(to Union Covered Bridge State Historic Site) in Monroe County, Spur Route K (into East Lynn) in Cass County, Spur Route AA (to the Sappington Cemetery State Historic Site) in Saline County, Spur Route J (to Sigsbee) in Shelby County, Spur Route V in Butler County, and Spur Route Y in Montgomery County. Then, one connector route: Connector Route M in Jefferson County It is erroneously believed that due to these roads being designated by letters rather than numbers and their existing in more than one county that these roads are county roads, not state highways, with some businesses and residences located on these roads saying their address is "County Road A" for example. This may have also arisen from the signage used prior to the early 1960s, where the letter was painted black against a white background, with the words "STATE ROAD" above the letter and the county name (in all capital letters) below the letter, or from the use of letters representing county trunk routes in Wisconsin. See also Missouri Route M (Jefferson County) Special route References Supplemental