|Length||73.4403 mi (118.1907 km)|
|South end||Route 106 in Kingston|
| Route 24 in Brockton|
U.S. Route 1 in Walpole
Route 9 in Natick
U.S. Route 20 in Wayland
Route 2 in Acton
|North end||Route 4 in Chelmsford|
|Counties||Plymouth, Norfolk, Middlesex|
Route 27 is a south–north highway in eastern Massachusetts that runs for 73.4 miles.
Route 27 begins in Kingston at Route 106, approximately 1-1/4 miles west of Route 3. It heads northwest towards Brockton, passing through Pembroke, Hanson, East Bridgewater and Whitman. In Brockton the road shares a triple concurrency with Route 28 and Route 123 Eastbound (Route 123 Westbound only intersects with the route). From the center of town, Route 27 heads northwest, past the Westgate Mall, over Route 24 at Exits 18A-B, and past Good Samaritan Hospital before passing into Norfolk County via Stoughton.
In Stoughton, the road has a brief concurrency with Route 138 in the center of town. It passes just south of the town of Canton before making a large loop through the town of Sharon. It crosses over Interstate 95 without access, between Exits 9 and 10, both of which are accessible via US Route 1 nearby. It then crosses through Walpole and Medfield before crossing the Charles River into Middlesex County and the town of Sherborn.
In Sherborn, the road begins a more northerly direction, with a short concurrency with Route 16 in the center of town. The road heads through the center of Natick, passing the town green and crossing Route 135, which carries the Boston Marathon at that point. Route 27 crosses over Route 9 with a four-way exit ramp system, just east of Lake Cochituate, the Natick Collection and the Golden Triangle retail area. Route 27 passes into Wayland and under the Massachusetts Turnpike, which it accesses via Route 30, just north of the Pike.
In Wayland, Route 27 has a 1.2-mile concurrency with Route 126, passing through the center of town and intersecting US Route 20. The road then crosses the Sudbury River into Sudbury and through the historic town center. It passes into Maynard, having a short, 0.1-mile concurrency with Route 62 over the Assabet River, before heading north into Acton. It crosses Route 2 at Exit 42 before crossing through the town center, past the Isaac Davis Monument. It sweeps by Carlisle before directly crossing into Westford, passing through the southeast corner of town before heading into Chelmsford. Route 27 ends at the center of town, at the intersection of Routes 4, 110 and 129, just south of Interstate 495 and U.S. Route 3.
Route 27's original form was identical to the modern route south of Wayland, with the exception of a bypass built in 1963 from the Charles River at the Sherborn-Medfield line to Route 109 in Medfield center.
North of Wayland the route followed current Route 126 into Concord. It came into its current form by 1939. However, historical maps from the U.S. Department of the Interior from 1943 show Route 27 running concurrent with US 20 from Wayland Center to Concord Road in Sudbury, then following Concord Road to Sudbury Center, where it resumed its current alignment on Hudson Road.
|Plymouth||Kingston||0.00||0.00||Route 106 to Route 3 / Route 3A – Plympton|
|Hanson||7.4||11.9||Route 58 – Halifax, Wareham, Hanson|
|East Bridgewater||10.8||17.4||Route 14 – East Bridgewater, Brockton, Hanson|
|Whitman||14.4||23.2||Route 18 – Bridgewater, New Bedford, Abington, South Weymouth|
|Brockton||16.2||26.1||Route 14 east – Hanson, Duxbury||Western terminus of Route 14|
|18.1||29.1||Route 28 south / Route 123 south – Bridgewater, Cape Cod||Southern terminus of concurrency with Routes 28 and 123 (southbound only)|
|18.2||29.3||Route 28 / Route 123 east – Abington, Norwell||Northern terminus of concurrency with Route 123 (southbound only)|
|18.3||29.5||Route 28 north – Randolph||Northern terminus of concurrency with Route 28|
|20.4||32.8||Route 24 – Boston, Fall River||Exits 18A-B on Route 24|
|Norfolk||Stoughton||23.9||38.5||Route 138 south / Route 139 east – Taunton, Randolph, Holbrook||Southern terminus of concurrency with Route 138; western terminus of Route 139|
|24.0||38.6||Route 138 north – Boston||Northern terminus of concurrency with Route 138; no southbound access to Route 138 north|
|Sharon||31.5||50.7||To I‑95 north – Boston||Access via Norwood Street|
|Walpole||31.8||51.2||US 1 to I‑95 south – Norwood, Dedham, Providence, RI|
|33.7||54.2||Route 1A – Norwood, Dedham, Wrentham|
|Medfield||37.9||61.0||Route 109 – Westwood, Boston, Millis, Milford|
|Middlesex||Sherborn||41.1||66.1||Route 115 south – Millis||Northern terminus of Route 115|
|43.5||70.0||Route 16 west – Holliston||Southern terminus of Route 16 concurrency|
|43.8||70.5||Route 16 east – South Natick||Northern terminus of Route 16 concurrency|
|Natick||46.7||75.2||Route 135 – Wellesley, Needham, Framingham, Hopkinton|
|48.0||77.2||Route 9 – Wellesley Hills, Boston, Framingham, Worcester||Grade-separated interchange|
|Wayland||49.3||79.3||Route 30 – Framingham, Worcester, Weston, Boston||Access to Mass Pike via Route 30 west|
|51.5||82.9||Route 126 south – Framingham, Ashland||Southern terminus of Route 126 concurrency|
|52.6||84.7||US 20 – Worcester, Boston|
|52.9||85.1||Route 126 north – Lincoln, Concord||Northern terminus of Route 126 concurrency|
|Maynard||59.3||95.4||Route 117 – Weston, Waltham, Stow, Bolton|
|60.0||96.6||Route 62 – Concord, Stow||0.1-mile (0.2 km) long concurrency|
|Acton||63.1||101.5||Route 111 – West Acton, Ayer, Concord||Additional access to Route 2 east via Route 111 east|
|63.4||102.0||Route 2 – Concord, Boston, Leominster, Fitchburg||Interchange; exit 42 on Route 2|
|65.7||105.7||Route 2A / Route 119 – East Acton, Concord, Littleton, Ayer|
|Westford||68.5||110.2||Route 225 – Westford, Groton, Carlisle, Bedford|
|Chelmsford||73.44||118.19||Route 4 to Route 110 – Bedford, Lexington, North Chelmsford, Nashua, NH, Lowell||To Route 129, I-495, US 3 via Route 4 north|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
|Wikimedia Commons has media related to Massachusetts Route 27.|
- Executive Office of Transportation, Office of Transportation Planning - 2005 Road Inventory
- "New England Road Builders Association". 43 (3): 11–12. Cite journal requires