List of highway route numbers in Oregon Mainline routes Mainline routes

| Number_ | South_west_end | North_east_end | Formed | Eliminated_ |
|---|---|---|---|---|
| Oregon Route 99 | I-5 south of Ashland | OR 99E/OR 99W in Junction City |  |  |
| Oregon Route 99E | OR 99/OR 99W in Junction City | I-5 in North Portland |  |  |
| Oregon Route 99E Business | I-5/OR 99E in Salem | OR 99E north of Salem |  |  |
| Oregon Route 99W | OR 99/OR 99E in Junction City | I-5 in Tigard |  |  |
| Oregon Route 103 | US 26 near Elsie | OR 202 at Jewell | 2002 |  |
| Oregon Route 104 | US 101 south of Warrenton | Fort Stevens State Park | 2002 |  |
| Oregon Route 104S | OR 104 in Warrenton | US 101 in Warrenton | 2002 |  |
| Oregon Route 120 | North Portland | I-5/OR 99E in North Portland | 2002 |  |
| Oregon Route 126 | US 101 in Florence | US 26 in Prineville |  |  |