1924– Original route established;[2] original alignment was along its current alignment from Bedford to Unity, SR 170’s current alignment from Unity to East Palestine, and SR 165’s current alignment from East Palestine to the Pennsylvania state line.[3]
1931– Extended to Cleveland via the former alignment of SR 8.[3]
1946– Eastern terminus moved to current location via the former alignment of SR 165.[3]
1951– Aligned with US 224 from Deerfield to Canfield and with SR 46 from Canfield to Columbiana; Deerfield-Columbiana alignment changed to SR 14A (Alternate).[3]
State Route 14 Temporary (SR14T) is a 2.73-mile-long[1] bypass around the city of Salem. SR14T, a four-lane highway, begins at SR14, Cleveland– East Liverpool Road, in Mahoning County. SR14T crosses into Columbiana County and passes under County Route 61 and Goshen Road. SR14T then has a diamond interchange with US62 and SR45. Exit ramps provide access from SR14T to US62 west and SR45 south, and the two highways merge onto the SR14T right-of-way as it continues past its terminus.
Although the SR14T designation is unsigned, signs on the road read "TO US62/ SR45". The entire route is built to freeway standards with a speed limit of 65 miles per hour (105km/h).
State Route 14A existed from 1951 to 1984 and followed what has been State Route 14 outside of that period between US 224 and SR 46 (see History section).
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US 6 / US 20 / US 422 / SR 8 / SR 43 / SR 87 in Cleveland 
PA 51 at the Pennsylvania state line
