List of highway route numbers in Oregon Mainline routes Mainline routes

| Number_ | South_west_end | North_east_end | Formed | Eliminated_ |
|---|---|---|---|---|
| Oregon Route 36 | OR 126 in Mapleton | OR 99W near Junction City | 1936 |  |
| Oregon Route 37 | I-84/US 395 in Pendleton | US 730 at Cold Springs | 1973 |  |
| Oregon Route 38 | US 101 in Reedsport | OR 99 in Drain | 1932 |  |
| Oregon Route 39 | CA 139 towards Alturas, CA | US 97 in Klamath Falls | 1932 |  |
| Oregon Route 42 | US 101 north of Coquille | I-5/OR 99 south of Roseburg | 1932 |  |
| Oregon Route 43 | OR 99E in Oregon City | US 26 in Portland | 1932 |  |
| Oregon Route 46 | US 199 in Cave Junction | Oregon Caves | 1932 |  |
| Oregon Route 47 | OR 99W north of McMinnville | US 30 in Clatskanie | 1932 |  |