Massachusetts Route 2A

Route 2A
Map of northern Massachusetts with Route 2A highlighted in red
Route information
Maintained by MassDOT
Length:	98.5 mi (158.5 km)
Major junctions
West end:	I‑91 / Route 2 in Greenfield
	US 5 / Route 10 in Greenfield US 202 / Route 2 in Phillipston I‑495 in Littleton I‑95 / Route 128 in Lexington US 3 in Arlington US 3 / Route 16 in Cambridge US 3 / Route 3 in Cambridge
East end:	Route 2 in Boston
Location
Counties:	Franklin, Worcester, Middlesex, Suffolk
Highway system
Massachusetts State Highway System Interstate US State ← Route 2 US 3 →

Route 2A exists in several sections of Massachusetts, mainly as parts of former Route 2 that have been moved or upgraded. Route 2A runs from Greenfield in the west to Boston in the east. Route 2A used to extend all the way to Shelburne Falls in Buckland in the west, but as of 2007, the route now terminates at Interstate 91 in Greenfield.

Route 2A begins at the rotary intersection of Route 2 at Interstate 91 in Greenfield. It passes through downtown Greenfield before reconnecting to its parent route just west of the Greenfield-Gill town line. After a 12.6-mile silent concurrency, Route 2A leaves its parent road once more, passing through Orange and Athol. In Athol it passes the former northern terminus of Route 21, which was truncated to Belchertown after the creation of the Quabbin Reservoir. From Phillipston through Westminster, Route 2A weaves around its parent route, crossing it a total of six times with five exits of access off of Route 2. In Fitchburg the road is shared with several other routes as it passes through the northern half of town. Once in Lunenburg it has another short concurrency with Route 13 just north of the former Whalom Park before crossing into Middlesex County at Shirley.