| Interstate Highways in Maine | |
|---|---|
  Standard markers for Interstate Highways in Maine | |
 Interstate Highways highlighted in red | |
| System information | |
| Maintained by MaineDOT | |
| Formed | June 29, 1957 |
| Highway names | |
| Interstates | Interstate x (I-X) |
| US Highways | U.S. Route x (US-X) |
| State | State Route x or Route x (SR X) |
| System links | |