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
Maine State Highway System Interstate US State Auto trails Lettered highways

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.^{[citation needed]}