List of lettered highways in Maine
| Lettered highways in Maine | |
|---|---|
Maine's early highway system | |
| System information | |
| Maintained by MaineDOT | |
| Highway names | |
| Interstates | Interstate x (abbreviated I-X) |
| US Highways | U.S. Route x (abbreviated US-X) |
| State | State Route x or Route x (abbreviated SR X) |
| Lettered routes | Route x |
| System links | |
From 1914 to 1925, Maine used a system of lettered highways to designate cross-state routes. It is unclear as to whether the system lasted through the recognition of pole-marked auto trails by the State Highway Commission in 1919, both systems were abandoned by 1925 in favor of the New England interstate highway system.