List of highway route numbers in Oregon Mainline routes Mainline routes

| Number_ | South_west_end | North_east_end | Formed | Eliminated_ |
|---|---|---|---|---|
| Oregon Route 204 | OR 11 north of Weston | OR 82 in Elgin | 1935 |  |
| Oregon Route 205 | Roaring Springs Ranch | OR 78 east of Burns | 1935 |  |
| Oregon Route 206 | I-84/US 30 at Celilo | OR 74 in Heppner | 1935 |  |
| Oregon Route 207 | US 26 in Mitchell | US 730 west of Cold Springs | 1935 |  |
| Oregon Route 208 | OR 219 south of Hillsboro | OR 10 in Beaverton | 1935 | 1982 |
| Oregon Route 209 | Crater Lake National Park | OR 58 at Crescent Lake Junction | 1935 | 1950s |
| Oregon Route 210 | OR 219 at Scholls | OR 10 west of Hillsdale | 1935 |  |
| Oregon Route 211 | OR 99E north of Woodburn | US 26 in Sandy | 1935 |  |