| State: | OH |
| Type: | SR |
| Route: | 559 |
| Maint: | ODOT |
| Map: | OH 559 map.svg |
| Length Mi: | 16.63 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Established: | 1937 |
| Direction A: | South |
| Terminus A: | in Mechanicsburg |
| Junction: | near Woodstock |
| Direction B: | North |
| Terminus B: | near North Lewisburg |
| Counties: | Champaign, Logan |
| Previous Type: | SR |
| Previous Route: | 558 |
| Next Type: | SR |
| Next Route: | 560 |
State Route 559 (SR 559) is a north - south state highway in the central portion of the U.S. state of Ohio. The southern terminus of the highway is at the signalized junction of State Route 29 and State Route 4 in downtown Mechanicsburg. Its northern terminus is at a T-intersection with State Route 287 approximately 4miles northwest of North Lewisburg.
State Route 559 runs through the eastern portion of Champaign County and the southeastern quadrant of Logan County. The route connects Lewisburg to Mechanicsburg and Middleburg. No part of the highway is included within the National Highway System, a network of routes deemed most important for the nation's economy, mobility and defense.[2]
Established in 1937, State Route 559 was originally routed along the same alignment that it occupies today through Champaign and Logan Counties. The highway has not experienced any major changes to its routing since its inception.[3] [4]