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In 1919, the Maine
Automobile Association and the Maine State Highway Commission collaborated to create a series of state-designated auto trails. The system posed a stark contrast to the auto trail systems of other states, which were often private endeavors, with improvements by these booster
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officially created by the State
Highway Commission, though it is unclear as to whether this system completely supplanted the lettering system. Both systems were abandoned by 1925 in favor of the
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organizations ranging from simple marked poles to paving and maintenance of the road. It is unclear which routes listed below existed at what times.
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to designate cross-state routes. This system was the first of its kind in the United States coordinated by a single state, predating
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Maine was one of the first states to mark their state highway system. From 1914 to 1925, Maine used a system of
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by three years. In 1919, this system was supplanted by a series of
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76:State Route x or Route x (abbreviated SR X)
376:Theodore Roosevelt International Highway
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149:New England interstate highway system
837:Poland Springs-White Mountain Trail
13:
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902:Auto trails in the United States
628:to Canada (New Brunswick) Line
66:U.S. Route x (abbreviated US-X)
56:Interstate x (abbreviated I-X)
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774:Brunswick-Greenville Highway
27:Maine's early highway system
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98:Maine State Highway System
676:Kennebec-Penobscot Trail
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897:Lists of roads in Maine
892:State highways in Maine
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437:Grafton Notch Highway
126:Lettered highways
526:Canada (Québec) Line
591:Route 100, 15, (24)
478:International Trail
21:Auto trails in Maine
731:Mount Desert Trail
446:New Hampshire Line
389:New Hampshire Line
319:New Hampshire Line
313:Longfellow Highway
201:New Hampshire Line
187:Modern designation
184:Replacement (1925)
604:1923: Extended to
141:Wisconsin's system
33:System information
875:
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298:A, C, D, L, M, N
195:Atlantic Highway
137:lettered highways
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858:Mechanic's Falls
548:Aroostock Trail
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62:US Highways
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522:Jackman Station
181:Lettered route
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81:Lettered routes
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38:Maintained by
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413:Highland Lake
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409:North Windham
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46:Highway names
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633:Capital Way
614:Presque Isle
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518:Caratunk Plt
506:Norridgewock
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89:System links
15:
719:US 202
691:South China
668:US 202
335:South Paris
327:Bryant Pond
281:Dennysville
217:Scarborough
145:auto trails
121:Auto trails
52:Interstates
886:Categories
878:References
864:Route 116
817:Route 104
810:Greenville
758:Route 183
751:Bar Harbor
746:Hulls Cove
715:Route 102
660:Route 100
567:Pittsfield
498:Waterville
331:West Paris
289:Robbinston
269:Millbridge
106:Interstate
741:Ellsworth
699:Searsmont
626:Madawaska
622:Van Buren
610:Mars Hill
599:US 1
595:US 2
558:Fairfield
540:U.S. 201A
532:Route 20
502:Skowhegan
485:Brunswick
470:US 2
466:Route 26
425:Route 18
363:US 2
359:Route 15
305:US 1
273:Jonesboro
261:Ellsworth
253:Searsport
241:Waldoboro
237:Wiscasset
229:Brunswick
213:Kennebunk
797:Guilford
648:Lewiston
643:Portland
579:Old Town
536:U.S. 201
490:Gardiner
429:U.S. 302
418:Portland
397:Bridgton
393:Fryeburg
352:Portland
301:Route 1
245:Rockland
225:Yarmouth
221:Portland
175:Through
40:MaineDOT
784:Newport
734:Yellow
708:Belfast
703:Belmont
695:Liberty
686:Augusta
679:Orange
653:Augusta
618:Caribou
608:, then
606:Houlton
584:Lincoln
571:Newport
563:Clinton
494:Augusta
442:Yellow
405:Raymond
316:Yellow
277:Machias
265:Hancock
249:Belfast
205:Kittery
169:Colors
84:Route x
868:SR 111
853:Poland
844:Naples
840:Green
805:Monson
801:Abbott
789:Dexter
779:White
777:Green
762:SR 183
736:White
681:White
664:SR 100
638:White
575:Bangor
551:White
459:Bethel
440:White
401:Naples
385:White
380:White
343:Poland
339:Norway
323:Bethel
294:Calais
257:Bangor
190:Notes
166:Route
849:Casco
825:SR 23
793:Dover
636:Blue
588:I, K
553:Blue
529:Q, H
514:Solon
510:Anson
463:T, O
454:Newry
450:Upton
367:SR 26
356:O, S
285:Perry
209:Wells
198:Blue
172:From
116:State
72:State
829:SR 6
821:SR 7
766:SR 3
723:SR 3
481:Red
382:Red
347:Gray
233:Bath
155:List
597:, (
178:To
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151:.
111:US
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