Allen County, Ohio

Prior to 1919, the Lincoln Highway entered Allen County from the east on what is now state route 309W to Lima and onto Delphos via what is now state route 309.

After 1919 it followed a more northern route though Beaverdam, (note: stay on two lane Lincoln Highway at I-75, do not follow four lane US 30) then Cairo and Gomer to Delphos.