The highway was first signed in 1923 and was much longer than it is today, going from the Indiana state line, west of Edon, to SR 101, east of Fremont.

SR 34 heads east from the Indiana state line towards Edon, as a two-lane highway passing through farmland with a few houses.

East of SR 49 the route leaves the town and crosses the Indiana Northeastern Railroad track.

In Blakeslee the route passes under a Norfolk Southern Railroad track and the highway turns east-southeast towards Bryan.

The street heads towards downtown Bryan, as a four-lane undivided highway passing through commercial and residential properties.

In 2008, ODOT figured that lowest traffic levels were the 990 vehicles used the highway daily on a section through Blakeslee.

The peak traffic volumes were 8,360 vehicles AADT along a section of SR 34 on the west side of Bryan.

[8][9] The route was signed in 1923 from the Indiana state line, west of Edon, east to SR 101.