County Highway Maps (1916-2017)
Highway_Map.jpg In March 1917, the Ohio General Assembly passed the White-Mulcahy Act.  This legislation provided that the county engineer in cooperation with the state highway commissioner create a map of roads in the county. The maps were also to show the road identifying number, municipal corporations, rivers and streams along with the townships in the county.  Currently, this legislation, last updated in 1973, is embodied in Ohio Revised Code section 5543.04, which is entitled Naming and Numbering Road and Bridge – Maps.  It still mandates that the county engineer create highway maps of the county and update the maps when new roads are established.    

   Union County Highway Maps
   1916   
   1927   
   1948   
   1951   
   1969   
   1971   
   1973   
1982
1985
   1987   
   1989   
   1991   
   1993   
   1995   
   1997   
   1999   
   2001   
   2003   
   2006   
   2010   
   2012   
   2017