Massachusetts Route 21

Route 21
Route 21 highlighted in red
Route information
Maintained by MassDOT
Length	13.73 mi[1] (22.10 km)
Major junctions
South end	US 20 in Springfield
Major intersections	I-90 / Mass Pike in Ludlow US 202 / Route 181 in Belchertown
North end	Route 9 in Belchertown
Location
Country	United States
State	Massachusetts
Counties	Hampden, Hampshire
Highway system
Massachusetts State Highway System Interstate US State
← Route 20A → Route 22

Route 21 is a 13.73-mile-long (22.10 km) south–north state highway in Massachusetts that runs between U.S. Route 20 (US 20) and Route 141 in Springfield and Route 9 in Belchertown. Along the way it intersects several major highways including Interstate 90 (I-90) in Ludlow and US 202 and Route 181 in Belchertown.