Ohio State Route185 replaced SR 120 in 1940, extended to US 127 by 1953, and realigned back to its eastern terminus in 2011.
Replacing what had been designated SR 120, the highway ran from its intersection with GreenvilleSt. SR 185 was applied in 1940. Marys Road (County Road 98, CR 98), at the time a part of US 127, to what was, until 2011, its eastern terminus in downtown Piqua at the intersection of US 36 and SR 66. 
