•
1923 – Original route established; originally followed its current alignment (more or less) from
Cincinnati to north of
Loudonville, the
SR 226 alignment from north of Loudonville to south of
Wooster, its old alignment from south of Wooster to
Medina, and
US 42's alignment from Medina to
Cleveland. •
1927 – north of Loudonville to south of Wooster rerouted to current alignment, along former SR 250; original alignment certified as SR 250; Medina-to-Parma routing changed to current alignment, and former alignment here certified as US 42. •
1932 – Alignment from Cincinnati to
Washington Court House dually certified with
US 22; alignment from Washington Court House to
Columbus dually certified with
US 62. •
1961 – SR 3 routed to new freeway alignment from
Harrisburg to Columbus. •
1962 – Harrisburg-Columbus alignment dually certified as
I-71. •
1967 – Reverted to US 62 alignment from Harrisburg to Columbus. ==Major intersections==