Its eastern terminus is at a T-intersection with State Route 603 just outside Mifflin.

This state highway runs through portions of Richland and Ashland Counties.

[2] State Route 430 follows part of what was previously US 30 through the Mansfield area.

[3] State Route 430 was designated circa 1960 after US 30 was rerouted to its current location in the northern parts of Mansfield and Ontario and the western terminus of US 30S was changed to the what is now the junction of US 30 and SR 309.

No changes of major significance have taken place to SR 430 since its inception.