Massachusetts Route 129

Route 129
Map of northeastern Massachusetts with Route 129 highlighted in red
Route information
Maintained by MassDOT
Length:	34.08 mi (54.85 km)
Existed:	1920s – present
Major junctions
West end:	Route 4 / Route 110 in Chelmsford
	US 3 in Chelmsford I‑93 in Wilmington I‑95 / Route 128 in Wakefield US 1 in Saugus / Lynnfield
East end:	Route 114 in Marblehead
Location
Counties:	Middlesex, Essex
Highway system
Massachusetts State Highway System Interstate US State ← Route 128A Route 130 →

Route 129 is an east–west Massachusetts state route that runs from Chelmsford to Marblehead.

Route 129 begins at Route 110 in Chelmsford Center, where the northbound lanes of Route 4 leave Route 110. The route passes out of the town center to the east before intersecting U.S. Route 3 at Exit 29. It passes into Billerica, and shortly thereafter has a concurrency with Route 3A for just over a mile, following southbound on that route and crossing the Concord River. The route then turns eastward once more, heading over the Shawsheen River into Wilmington. In Wilmington, Route 129 becomes concurrent with Route 38, crossing Route 62 and passing the Wilmington MBTA station in the process. The two routes split south of the intersection, with Route 129 heading more southeasterly towards its intersection with Interstate 93 at Exit 38.

After crossing I-93, Route 129 heads into Reading. The route crosses Route 28 just north of the town center before continuing eastward. At the town line with Wakefield, the route enters a rotary intersection with I-95/Route 128 at Exit 40, most of which is in the town of Wakefield. Shortly after leaving the rotary, and just after crossing the Saugus River, Route 129 turns southward along Main Street, following the eastern side of Lake Quannapowitt towards the town center. At Water Street, Route 129 turns eastward, passing the Center Depot, which is on the National Register of Historic Places and along the Haverhill Line (though currently without a stop). From Wakefield, Route 129 enters Saugus and Essex County. Passing the Breakheart Reservation, the route joins U.S. Route 1 at a cloverleaf intersection, following the route concurrently northward into Lynnfield.