Massachusetts Route 111

Route 111
Map of northeastern Massachusetts with Route 111 highlighted in red
Route information
Length:	27.282 mi (43.906 km)
Existed:	1926 – present
Major junctions
South end:	Route 2 / Route 2A / Route 119 in Concord
	I‑495 in Boxborough Route 2 in Harvard Route 119 / Route 225 in Groton
North end:	NH 111 at Hollis, NH
Location
Counties:	Worcester, Middlesex
Highway system
Massachusetts State Highway System Interstate US State ← Route 110A Route 112 →

Route 111 is a state highway in Massachusetts, a continuation of New Hampshire Route 111. The route has a north–south component and an east–west one, though it is signed exclusively as a north–south route on newer signs. The east–west portion of the route largely follows the path of the Union Turnpike, built in the early 19th century to connect the communities of Leominster and Concord. (A few older east–west directional signs still exist east of Harvard.)

Route 111 begins in Concord at the rotary junction of Route 2, Route 2A and Route 119, next to Massachusetts Correctional Institution – Concord. The route is concurrent along Union Turnpike with Route 2 for the first 2.4 miles (3.9 km) into Acton, before Route 2 heads northwestward, beginning its western highway portion. Route 111 continues along Massachusetts Avenue, having a junction with Route 27 not far from the split. The split is Exit 43.

Route 111 continues relatively westward along Massachusetts Avenue through Boxborough, meeting I-495 at Exit 28, just before entering Harvard. In Harvard, the route leaves Massachusetts Avenue at its far western end, looping around until it meets Route 110 at that town's center. The two routes continue northward, crossing Route 2 at exit 38, before continuing northward, east of Fort Devens into Ayer. In Ayer, Route 111 splits from Route 110 as that route turns eastward with Route 2A Eastbound, while Route 111 turns westbound along that route, passing concurrently with it along Ayer's Main Street.