49.81 mi
80.16 km
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U.S. Route 1A
| LENGTH | 49.81 mi / 80.16 km |
| SOUTH END | US 1, Mars Hill |
| NORTH END | US 1, Van Buren |
| PLACES | Mars Hill, Easton, Fort Fairfield, Limestone, Caswell, Hamlin, Van Buren |
| COUNTIES | Aroostook |
| CONCURRENCIES | Route 167, Fort Fairfield (2.1 miles) |
| RIVER CROSSINGS | Prestile Stream, Mars Hill Aroostook River, Fort Fairfield |
| NAMES | Bridge Street, Fort Road (Mars
Hill) Houlton Road, Fort Fairfield Road (Easton) Houlton Road, Presque Isle Street, Bridge Street, Limestone Road (Fort Fairfield) Fort Fairfield Road, Main Street, Van Buren Road (Limestone) |
| HIGHEST AADT | 6,680 at Route 161/167, Fort Fairfield (2004) |
| LOWEST AADT | 860 in Hamlin (2004) |
History
Originally, US 1A in Aroostook County followed present-day US 1 between Mars Hill and Presque Isle, while US 1 took present-day 1A to Easton, crossing over to Presque Isle on Route 10. US 1 assumed its current routing in 1940, and the current US 1A was born. For many years, US 1A ended in Caribou by following its current routing to Fort Fairfield and present-day Route 161 to Caribou. 1A's current routing came into being in 1989 when it took over the route of decommissioned Route 165 from Fort Fairfield to Van Buren.
Guide
Junction List
| Location | mi | Routes / Destination | Other Notes |
| Mars Hill | 0.0 | US 1 - Main St. - Houlton, Presque Isle | |
| Mars Hill | 0.1 | Silver St. | |
| Mars Hill | 0.4 | Boynton Rd. | |
| Mars Hill | 0.7 | West Ridge Rd. | |
| Mars Hill | 1.0 | East Ridge Rd. | |
| Easton | 9.2 |
Route 10 - Center Rd. - Presque Isle Ladner Rd. |
|
| Easton | 12.1 | Conant Rd. | |
| Fort Fairfield | 13.2 | Upcountry Rd. | |
| Fort Fairfield | 14.4 | Route 163 - Maple Grove Rd. - Presque Isle | |
| Fort Fairfield | 15.0 | Bryant Pond Rd. | |
| Fort Fairfield | 16.7 | Route 167 west - Presque Isle Rd. - Presque Isle | |
| 2.1-mile multiplex with Route 167 begins | |||
| Fort Fairfield | 18.5 | Currier Rd. | |
| Fort Fairfield | 18.6 | Columbia Ave. | |
| Fort Fairfield | 18.7 | Brown St. | |
| Fort Fairfield | 18.9 |
Route 167 east - Main St. - Perth-Andover, NB Route 161 - South Caribou Rd. - Caribou |
 |
| 2.1-mile multiplex with Route 167 ends | |||
| Fort Fairfield | 19.0 | North Caribou Rd. / Riverside Ave. | |
| Fort Fairfield | 19.5 | West Limestone Rd. | |
| Fort Fairfield | 22.5 | McNamee Rd. | |
| Fort Fairfield | 24.6 | Old East Rd. | |
| Limestone | 27.4 |
Route 223 - Noyes Rd. - Caribou Blake Rd. |
|
| Limestone | 28.9 | Bog Rd. | |
| Limestone | 29.5 | Long Rd. | |
| Limestone | 29.7 | Route 229 - Bridge St. - Grand Falls, NB | |
| Limestone | 29.8 | Route 89 - Foster Ave. - Caribou | |
| Limestone | 31.0 | Mill Rd. | |
| Caswell | 34.0 | Willard Rd. / Cross Rd. | |
| Hamlin | 40.9 | Boundary Rd. - to Grand Falls, NB | |
| Hamlin | 49.4 | Riverview Dr. | |
| Van Buren | 49.8 | US 1 - State St., Main St. - Caribou, Madawaska | |
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