# Maine State Route 100

State Route 100 (SR 100) is a state highway in the U.S. state of Maine, running from Portland to Bangor.
The south end of SR 100 is at the intersection of Forest Avenue and Cumberland Avenue in downtown Portland. Its north end is at the intersection of Hammond Street, Main Street, State Street and Central Street in downtown Bangor; SR 100 runs along Hammond Street with U.S. Route 2 (US 2) which continues across Main Street/Central Street onto State Street.
The majority of SR 100 is concurrent with other routes: US 302 from downtown Portland to northern Portland, SR 26 from northern Portland to Gray, US 202 from Gray to Augusta, US 201 from Augusta to Fairfield, SR 11 from Fairfield to Newport, and US 2 from Newport to downtown Bangor. The only parts of SR 100 that do not run along another route are in Portland, first (as Forest Avenue) between its southern terminus and the Interstate 295/US 1 interchange (where US 302 begins) and between US 302 and SR 26 where it is alone on a small piece of Allen Avenue.

## Major junctions

| County | Location | mi | km | Destinations | Notes |
| Cumberland | Portland | 0.00 | 0.00 | Cumberland Avenue / Forest Avenue | |
| Cumberland | Portland | 0.39– 0.60 | 0.63– 0.97 | I-295 / US 1 / US 302 begins – Falmouth, South Portland | Exit 6 on I-295; southern end of US 302 concurrency |
| Cumberland | Portland | 1.45 | 2.33 | SR 9 south (Woodford Street) / Deering Avenue | Southern end of SR 9 concurrency |
| Cumberland | Portland | 1.54 | 2.48 | SR 9 north (Ocean Avenue) / Saunders Street | Northern end of SR 9 concurrency |
| Cumberland | Portland | 2.79 | 4.49 | US 302 west (Forest Avenue) – Westbrook | Northern end of US 302 concurrency |
| Cumberland | Portland | 3.62 | 5.83 | SR 26 south (Washington Avenue) / Allen Avenue – Falmouth | Southern end of SR 26 concurrency |
| Cumberland | Falmouth | 5.95– 6.00 | 9.58– 9.66 | I-95 / Maine Turnpike – Kittery, Boston, Old Orchard Beach, Lewiston, Augusta | Exit 53 on I-95 / Turnpike |
| Cumberland | Gray | 16.74– 16.77 | 26.94– 26.99 | US 202 west / SR 4 south / SR 115 / SR 26A north (Gray Road / Yarmouth Road) to I-95 / Maine Turnpike – Windham | Southern end of US 202 / SR 4 concurrency; southern terminus of SR 26A |
| Cumberland | Gray | 16.79 | 27.02 | SR 26 north (Shaker Road) – Norway | Northern end of SR 26 concurrency |
| Cumberland | New Gloucester | 24.36 | 39.20 | SR 231 south (Intervale Road) / Bald Hill Road – New Gloucester | Northern terminus of SR 231 |
| Androscoggin | Auburn | 27.01 | 43.47 | SR 122 west (Poland Spring Road) / Moose Brook Road – Poland | Eastern terminus of SR 122 |
| Androscoggin | Auburn | 27.99– 28.13 | 45.05– 45.27 | I-95 / Maine Turnpike – Portland, Boston, Lewiston, Augusta | Exit 75 on I-95 / Turnpike |
| Androscoggin | Auburn | 32.08– 32.13 | 51.63– 51.71 | SR 11 south / SR 121 west (Minot Avenue) – Minot, Mechanic Falls | Southern end of SR 11 concurrency; eastern terminus of SR 121; access from southbound US 202 / SR 4 only |
| Androscoggin | Auburn | 32.77 | 52.74 | SR 4 north (Union Street) / Court Street – Farmington | Northern end of SR 4 concurrency |
| Androscoggin | Auburn | 33.04 | 53.17 | SR 136 south (Mechanics Row) / Turner Street | Northern terminus of SR 136 (southbound direction of SR 136) |
| Androscoggin | Auburn | 33.11 | 53.29 | SR 136 (Main Street) / Great Falls Plaza | Northern terminus of SR 136 (northbound direction of SR 136) |
| Androscoggin | Lewiston | 33.45– 33.47 | 53.83– 53.86 | SR 196 south (Canal Street) to I-95 / Maine Turnpike – Lisbon, Brunswick | Northern terminus of SR 196 (southbound direction of SR 136) |
| Androscoggin | Lewiston | 33.49 | 53.90 | SR 196 (Lisbon Street) / Chapel Street Alley | Northern terminus of SR 196 (northbound direction of SR 136) |
| Androscoggin | Lewiston | 33.67– 33.70 | 54.19– 54.23 | SR 126 east (Sabattus Street) – Sabattus | Western terminus of SR 126 |
| Androscoggin | Lewiston | 34.53– 34.61 | 55.57– 55.70 | Russell Street - To SR 196 / SR 126 – Lisbon, Auburn | Interchange |
| Androscoggin | Leeds | 45.45 | 73.14 | SR 106 north | Southern terminus of SR 106 |
| Kennebec | Monmouth | 49.55 | 79.74 | SR 132 south (Main Street) / Blaisdell Road – Monmouth | Northern terminus of SR 132 |
| Kennebec | Winthrop | 52.71– 52.98 | 84.83– 85.26 | SR 41 / SR 133 north (Western Avenue) – Readfield, Downtown Winthrop, Wayne | Interchange; southern termini of SR 41 / SR 133 |
| Kennebec | Winthrop | 55.96 | 90.06 | SR 135 north (Stanley Road) – Readfield, Belgrade | |
| Kennebec | Winthrop | 56.08 | 90.25 | SR 135 south (Winthrop Center Road) – East Monmouth | |
| Kennebec | Manchester | 59.31 | 95.45 | SR 17 west (Readfield Road) / Pond Road – Readfield, Litchfield | Southern end of SR 17 concurrency |
| Kennebec | Augusta | 61.89– 62.14 | 99.60– 100.00 | I-95 / Maine Turnpike south – Portland, Bangor | Northern terminus of Maine Turnpike; exit 109 on I-95 / Turnpike |
| Kennebec | Augusta | 63.62– 63.67 | 102.39– 102.47 | US 201 south / SR 8 north / SR 11 north / SR 27 (State Street) – Gardiner, Belgrade | Memorial Circle; southern end of US 201 concurrency; northern end of SR 11 concurrency; southern terminus of SR 8 |
| Kennebec River | Kennebec River | 63.93– 64.30 | 102.89– 103.48 | Memorial Bridge | Memorial Bridge |
| Kennebec | Augusta | 64.35– 64.44 | 103.56– 103.71 | SR 9 west / SR 17 east (Stone Street) / SR 105 east to SR 27 (Cony Street) – Downtown Augusta | Cony Circle; northern end of SR 17 concurrency; southern end of SR 9 concurrency; western terminus of SR 105 |
| Kennebec | Augusta | 65.01– 65.03 | 104.62– 104.66 | US 202 east (North Belfast Avenue) / SR 9 north – China | Northern end of US 202 / SR 9 concurrency |
| Kennebec | Augusta | 65.67– 65.69 | 105.69– 105.72 | SR 3 to I-95 – Augusta Civic Center Drive, Portland, Belfast | |
| Kennebec | Winslow | 80.87 | 130.15 | SR 137 (Carter Memorial Drive) – Oakland, China | |
| Kennebec | Winslow | 81.81 | 131.66 | SR 137 Bus. east (China Road) – China | Southern end of SR 137 Bus. concurrency |
| Kennebec | Winslow | 81.94 | 131.87 | SR 100A north (Halifax Street) – Clinton, Burnham | Southern terminus of SR 100A |
| Kennebec | Waterville | 82.61– 82.67 | 132.95– 133.04 | SR 137 Bus. west (Spring Street) to Water Street south / I-95 – Oakland | Northern end of SR 137 Bus. concurrency |
| Kennebec | Waterville | 83.06 | 133.67 | SR 11 south / SR 104 (Elm Street / Main Street) – Oakland, Sidney | Southern end of SR 11 concurrency; intersection with SR 104 in southbound lanes only |
| Somerset | Fairfield | 86.10– 86.14 | 138.56– 138.63 | US 201 north / SR 139 west (Upper Main Street) to Lawrence Avenue / I-95 | Northern end of US 201 concurrency; southern end of SR 139 concurrency |
| Kennebec | Benton | 88.25– 88.28 | 142.02– 142.07 | SR 100A south (Clinton Avenue) – Winslow | Northern terminus of SR 100A |
| Kennebec | Benton | 88.33 | 142.15 | SR 139 east (Sebasticook Bridge Road) – Albion, Unity | Northern end of SR 139 concurrency |
| Waldo | No major junctions | No major junctions | No major junctions | No major junctions | No major junctions |
| Somerset | Pittsfield | 105.54 | 169.85 | SR 69 east (Hunnewell Avenue) – Detroit | Western terminus of SR 69 |
| Somerset | Pittsfield | 105.61 | 169.96 | SR 152 north (Somerset Avenue) to I-95 – Hartland | Southern terminus of SR 152 |
| Somerset | Palmyra | 109.59 | 176.37 | SR 220 south (Main Street) – Detroit | Northern terminus of SR 220 |
| Somerset | Palmyra | 111.78– 112.07 | 179.89– 180.36 | I-95 – Bangor, Waterville | Exit 157 (I-95) |
| Penobscot | Newport | 112.27– 112.37 | 180.68– 180.84 | US 2 west (Main Street) / SR 7 north / SR 11 north (Moosehead Trail) – Skowhegan, Sugarloaf, Dexter | Southern end of US 2 / SR 7 concurrencies; northern end of SR 11 concurrency |
| Penobscot | Newport | 115.86 | 186.46 | SR 7 south (Roussin Road) to Stetson Road / I-95 – Dixmont, Plymouth | Northern end of SR 7 concurrency |
| Penobscot | Etna | 121.44 | 195.44 | SR 143 (Lakins Road / Dixmont Road) – Stetson, Dixmont | |
| Penobscot | Carmel | 124.71 | 200.70 | SR 69 (Plymouth Road / Hampden Road) to I-95 – Winterport | |
| Penobscot | Bangor | 137.19– 137.30 | 220.79– 220.96 | I-395 east to I-95 / SR 15 / Odlin Road – Newport, Orono, Bangor, Brewer | Western terminus and exits 1A-B on I-395; cloverleaf interchange |
| Penobscot | Bangor | 138.28– 138.43 | 222.54– 222.78 | I-95 / SR 15 – Newport, Augusta, Orono, Houlton | Exit 183 on I-95 |
| Penobscot | Bangor | 139.62 | 224.70 | SR 222 west (Union Street) | Eastern terminus of SR 222 |
| Penobscot | Bangor | 139.93 | 225.20 | US 2 east (State Street) / Central Street / Main Street | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi ||||||

## Alternate route

State Route 100A (SR 100A) is a 5.2-mile (8.4 km) alternate route of SR 100 running between the towns of Winslow and Benton.
Route 100A's alignment was formerly part of SR 32, before SR 32 was truncated in 1954 to end at SR 137 Business, near its intersection with US 201/SR 100 just south of SR 100A's current terminus. The old alignment, which connected to SR 100 at both ends, was redesignated as SR 100A (as a bypass of SR 100's alignment in Winslow and Benton).