Route 3A | |||||||
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Route information | |||||||
Length: | 97 mi (156 km) | ||||||
Existed: | 1926 – present | ||||||
Southern section | |||||||
Length: | 53.392 mi (85.926 km) | ||||||
South end: |
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Major junctions: |
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North end: |
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Northern section | |||||||
Length: | 22.504 mi (36.217 km) | ||||||
South end: |
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Major junctions: |
Lowell Connector in Lowell![]() ![]() |
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North end: |
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Location | |||||||
Counties: | Plymouth, Norfolk, Suffolk, Middlesex | ||||||
Highway system | |||||||
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Route 3A is a state highway in eastern Massachusetts, which parallels Route 3 and U.S. Route 3 from Cedarville in southern Plymouth to Tyngsborough at the New Hampshire state line.
Route 3A has two major posted segments, separated by a lengthy concurrency with Route 3 and US 3. Its southern portion parallels Route 3 from Cedarville in southern Plymouth to Neponset in the Dorchester area of Boston. Towns and cities that Route 3A traverse along its path include Plymouth, Kingston, Duxbury, Marshfield, Scituate, Cohasset, Hingham, Weymouth and Quincy.