Route of SR 9 highlighted in red; SR 9 Bus. in green | ||||
| Route information | ||||
| Maintained byMaineDOT | ||||
| Length | 289.27 mi[1] (465.53 km) | |||
| Existed | 1925, 2007 (current alignment)–present | |||
| Major junctions | ||||
| West end | ||||
| Major intersections | ||||
| East end | Ferry Point International Bridge inSt. Stephen, NB,Canada | |||
| Location | ||||
| Country | United States | |||
| State | Maine | |||
| Counties | York,Cumberland,Androscoggin,Kennebec,Waldo,Penobscot,Hancock,Washington | |||
| Highway system | ||||
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State Route 9 (SR 9) is a numberedstate highway inMaine, running from theNew Hampshire border atBerwick in the west to theCanada–US border withNew Brunswick atCalais in the east. SR 9 runs a total of 289 miles (465 km).

State Route 9 is a meandering highway that works its way fromNew Hampshire toCanada. It frequently runsconcurrently with other highways listed below and also frequently changes direction.
State Route 9 runs through most of Maine's major cities includingBiddeford,Saco,South Portland,Portland,Augusta, andBangor.
Over the years, a number of improvements have been made by the Route 9 Committee, a partnership of local government officials and business interests in the Baileyville-Calais area.
The leg from Bangor toCalais is often referred to as "The Airline," commonly thought to be because of its shorter route than the olderU.S. 1. (Before the coming ofair travel, the termairline often referred to such a shortcut.) Although anecdotes about unexploded ordnance deriving from bombers flying from the formerDow Air Force Base (nowBangor International Airport) using a number of towers and landmarks along "The Airline", in fact the term goes back to the early 1850s as a contrast to theshoreline route.[2] The last section of "The Airline" was paved in 1973 in Crawford and many old sections of the road are visible to the side of the present roadway. The "Whale's Back", a two-mile stretch built atop anesker inHancock County was one of the most notable features of the highway until it was rebuilt.[3]
Plans to extendI-395 connecting it to SR 9 began as early as 2001.[4] In February 2008,MaineDOT suggested five possible routes to extend I-395 to SR 9, with two in particular designated as "State's Choice" and "Holden's Choice".[5] The state approved the "Holden's Choice" route, designated 2B-2. All three affected communities issued resolutions in 2014 opposing this route.[6]
The state went forward with the project not as an I-395 extension but as a 5.5-mile (9 km)super two rerouting of SR 9. The design was finalized in 2021, with construction commencing in 2022.
MaineDOT completed the project with a ribbon cutting ceremony on June 27, 2025.[7] When it opened, the existing segment of Route 9 that ran through the downtown areas ofHampden,Brewer and Bangor became Route 9 Business.[8]
| County | Location | mi | km | Destinations | Notes |
|---|---|---|---|---|---|
| York | Berwick | 0.0 | 0.0 | Continuation intoNew Hampshire | |
| 0.2 | 0.32 | Northern terminus of SR 236 | |||
| North Berwick | 7.2 | 11.6 | Southern terminus of concurrency | ||
| 7.6 | 12.2 | Northern terminus of concurrency | |||
| Wells | 11.4 | 18.3 | Western terminus of SR 9B | ||
| 13.5 | 21.7 | Western terminus of SR 9A | |||
| 14.3 | 23.0 | Northern terminus of concurrency | |||
| 14.9 | 24.0 | Maine Turnpike exit 19 | |||
| 16.5 | 26.6 | Southern terminus of SR 109 Southern terminus of US 1/SR 9 concurrency | |||
| 18.3 | 29.5 | Northern terminus of US 1/SR 9 concurrency | |||
| Kennebunk | 22.5 | 36.2 | Eastern terminus of SR 9A Southern terminus of SR 35 | ||
| Biddeford | 31.8 | 51.2 | Southern terminus of concurrency | ||
| 37.1 | 59.7 | Eastern terminus of SR 111 Northern terminus of SR 208 | |||
| Saco | 38.1 | 61.3 | Southern terminus of SR 112 | ||
| Old Orchard Beach | 45.7 | 73.5 | Southern terminus of SR 5 | ||
| Cumberland | Scarborough | 51.1 | 82.2 | Southern terminus of concurrency | |
| 54.2 | 87.2 | Southern terminus of SR 114 Northern terminus of SR 207 | |||
| 55.4 | 89.2 | Partial interchange | |||
| South Portland | 56.7 | 91.2 | UnsignedSR 703 | ||
| 56.8 | 91.4 | Northern terminus of concurrency | |||
| 57.6 | 92.7 | I-295 exit 3; partial interchange No access to SR 9 from I-295 north | |||
| Portland | 59.4 | 95.6 | Maine Turnpike exit 46 | ||
| 59.7 | 96.1 | Western terminus of concurrency | |||
| 61.2 | 98.5 | Eastern terminus of concurrency | |||
| 61.2 | 98.5 | ||||
| 62.6 | 100.7 | Southern terminus of concurrency | |||
| 62.7 | 100.9 | Northern terminus of concurrency | |||
| 63.9 | 102.8 | ||||
| Falmouth | 67.3 | 108.3 | I-295 exit 10 | ||
| North Yarmouth | 74.3 | 119.6 | Southern terminus of concurrency | ||
| 74.6 | 120.1 | Northern terminus of concurrency | |||
| Androscoggin | Durham | 86.9 | 139.9 | Southern terminus of concurrency | |
| 87.3 | 140.5 | Northern terminus of concurrency | |||
| 91.1 | 146.6 | Southern terminus of SR 9/125 concurrency | |||
| Lisbon | 91.4 | 147.1 | Northern terminus of SR 9/125 concurrency Eastern terminus of SR 9/196 concurrency | ||
| 92.2 | 148.4 | Western terminus of SR 9/196 concurrency | |||
| Sabattus | 99.3 | 159.8 | Maine Turnpike exit 86 | ||
| 100.7 | 162.1 | Western terminus of concurrency | |||
| 101.7 | 163.7 | Southern terminus of SR 132 | |||
| 102.9 | 165.6 | Western terminus of SR 197 | |||
| Kennebec | West Gardiner | 117.3 | 188.8 | Maine Turnpike exit 102; partial interchange | |
| 117.4 | 188.9 | I-295 exit 51 | |||
| Gardiner | 120.5 | 193.9 | Southern terminus of US 201/SR 9/126 concurrency | ||
| 120.9 | 194.6 | Northern terminus of US 201/SR 9 concurrency Western terminus of SR 9/27/126 concurrency Northern terminus of SR 24 | |||
| Randolph | 121.1 | 194.9 | Eastern terminus of SR 9/27/126 concurrency | ||
| Augusta | 126.8 | 204.1 | Southern terminus of SR 9/17 concurrency | ||
| 127.3 | 204.9 | Northern terminus of SR 9/17 concurrency Southern terminus of US 201/202/SR 9/100 concurrency Western terminus of SR 105 | |||
| 127.9 | 205.8 | Northern terminus of US 201/SR 9/100 concurrency | |||
| 128.9 | 207.4 | Western terminus of US 202/SR 3/9 concurrency | |||
| China | 138.1 | 222.3 | Western terminus of concurrency | ||
| 139.3 | 224.2 | Eastern terminus of concurrency | |||
| 139.5 | 224.5 | Eastern terminus of US 202/SR 3/9 concurrency | |||
| 146.6 | 235.9 | Western terminus of concurrency | |||
| Albion | 153.9 | 247.7 | Eastern terminus of concurrency | ||
| Waldo | Unity | 160.2 | 257.8 | Western terminus of US 202/SR 9/139 concurrency | |
| 161.1 | 259.3 | Eastern terminus of US 202/SR 9/139 concurrency Southern terminus of US 202/SR 9/220 concurrency | |||
| Troy | 164.1 | 264.1 | Northern terminus of US 202/SR 9/220 concurrency | ||
| Penobscot | Dixmont | 170.8 | 274.9 | ||
| 173.0 | 278.4 | Southern terminus of SR 143 | |||
| Newburgh | 181.4 | 291.9 | |||
| Hampden | 187.5 | 301.8 | Western terminus of SR 9 Bus. | ||
| Bangor | 192.4 | 309.6 | Exit 2 on I-395; western terminus of I-395/SR 9 concurrency, eastern terminus of US 202 | ||
| 192.7 | 310.1 | Exit 3 on I-395 | |||
| Brewer | 193.4 | 311.2 | Exit 4 on I-395, eastern end of SR 15 concurrency | ||
| 194.1 | 312.4 | Industrial Park Road / Parkway South –Brewer | Exit 5 on I-395 | ||
| 195.9 | 315.3 | Exit 6A on I-395 | |||
| 196.2 | 315.8 | Exit 6B and eastern terminus of I-395, beginning of the segment that opened in 2025 | |||
| Eddington | 201.5 | 324.3 | End of the segment that opened in 2025, Eastern terminus of SR 9 Bus. | ||
| 205.3 | 330.4 | Northern terminus of SR 46 | |||
| Clifton | 207.7 | 334.3 | Northern terminus of SR 180 | ||
| Hancock | Amherst | 218.1 | 351.0 | Northern terminus of SR 181 | |
| Aurora | 220.2 | 354.4 | Northern terminus of SR 179 | ||
| Washington | Beddington | 234.2 | 376.9 | Northern terminus of SR 193 | |
| Wesley | 259.1 | 417.0 | Northern terminus of SR 192 | ||
| Baileyville | 281.9 | 453.7 | Western terminus of US 1/SR 9 concurrency | ||
| Baring | 283.2 | 455.8 | Northern terminus of SR 191 | ||
| Calais | 286.6 | 461.2 | Rotary;International Avenue Bridge - As of 2010, all commercial vehicles must use this border crossing | ||
| 287.2 | 462.2 | Milltown International Bridge | |||
| 288.8 | 464.8 | Eastern terminus of US 1/SR 9 concurrency | |||
| 289.2 | 465.4 | Ferry Point International Bridge Eastern terminus of SR 9 | |||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
| |||||
| Location | Hampden–Eddington |
|---|---|
| Length | 12.9 mi (20.8 km) |
| Existed | 2025–present |
State Route 9 Business (abbreviatedSR 9 Bus. orSR 9B) is a 12.9-mile (20.8 km)business route of SR 9. Its western terminus is at US 202 and SR 9 in Hampden. Its eastern terminus is at SR 9 in Eddington.
SR 9 Business was designated in 2025 after SR 9 was rerouted to bypass the downtown areas of Hampden, Brewer, and Bangor via US 202 and I-395.
The entire route is inPenobscot County.
| Location | mi | km | Destinations | Notes | |
|---|---|---|---|---|---|
| Hampden | 0.0 | 0.0 | Western terminus of SR 9B | ||
| 0.3 | 0.48 | Western terminus of US 1A/SR 9B concurrency | |||
| Bangor | 4.3 | 6.9 | I-395 exit 3 | ||
| Brewer | 5.8 | 9.3 | Eastern terminus of US 1A concurrency, Western terminus of SR 15B concurrency | ||
| 6.0 | 9.7 | Eastern terminus of SR 15B concurrency | |||
| 6.1 | 9.8 | State Street (former US 1A) | Southern terminus of SR 178 | ||
| Eddington | 10.2 | 16.4 | Eastern terminus of SR 9B/SR 178 concurrency | ||
| 12.9 | 20.8 | Eastern terminus of SR 9B | |||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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