Massachusetts Route 109

Route 109
Map of eastern Massachusetts with Route 109 highlighted in red
Route information
Maintained by MassDOT
Length:	20.97 mi (33.75 km)
Existed:	1933 – present
Major junctions
West end:	Route 16 in Milford
	I‑495 in Milford Route 126 in Medway Route 115 in Millis Route 27 in Medfield I‑95 / Route 128 in Dedham
East end:	VFW Parkway in Boston
Location
Counties:	Worcester, Norfolk, Suffolk
Highway system
Massachusetts State Highway System Interstate US State ← Route 108 Route 109A →

Route 109 is a state highway in eastern Massachusetts. It runs from Route 16 in Milford east to the VFW Parkway in Boston. Most of Route 109 runs along a portion of the Hartford and Dedham Turnpike.

Route 109 begins at Route 16 in Milford, just east of Route 85's southern terminus. The route proceeds to the east, meeting Interstate 495 at Exit 19 before crossing into Norfolk County and the town of Medway. Route 109 passes through northern Medway, crossing Route 126 along the way before turning onto Main Street. The highway crosses the Charles River and continues into Millis, where it crosses Route 115 in the center of town. The road then enters Medfield, passing through the center of town where it intersects Route 27.

East of Medfield, Route 109 travels along the Dover - Walpole town line before entering Westwood. The highway passes through the town, easing towards the urban landscape of metro Boston. North of the center of town, Route 109 interchanges with Interstate 95 (Route 128) at Exit 16 as it enters Dedham. Route 109 passes through northwest Dedham, crossing the Charles twice more before crossing into the Boston neighborhood of West Roxbury, where it immediately meets the VFW Parkway and ends.