Connecticut Route 12

Route 12
Map of eastern Connecticut with Route 12 highlighted in red
Route information
Maintained by CTDOT
Length	54.46 mi[1] (87.64 km)
Existed	1922–present
Major junctions
South end	I-95 / US 1 / Route 184 in Groton
Major intersections	Route 2A in Preston Route 2 in Norwich I-395 in Lisbon Route 14 in Central Village US 6 in Danielson Route 101 in Dayville US 44 in Putnam
North end	Route 12 at Dudley, MA
Location
Country	United States
State	Connecticut
Counties	New London, Windham
Highway system
Connecticut State Highway System Interstate US State SSR SR Scenic
← Route 11 → Route 14
← Route 11 N.E. → Route 12A

Connecticut Route 12 is a state highway that runs between Groton and the state line in Thompson.

Route 12 was preceded by New England Interstate Route 12. The southern terminus of NE-12 was originally at New London, Connecticut. It travelled along present-day Route 32 (along the west bank of the Thames River) from New London to Norwich, Connecticut. In 1932, when Connecticut decommissioned its New England Routes, Route 12 swapped places with Route 32 south of Norwich. From Norwich to the Massachusetts border, Route 12 still follows its 1920s alignment.

Route 12 from Groton to Norwich is a primary route, serving the Naval Submarine Base New London and is known as the U.S. Submarine Veterans Memorial Highway. North of Norwich, Route 12 is a minor road closely paralleling Interstate 395. Route 12 goes through the following towns: Groton, Ledyard, Preston, Norwich, Lisbon, Griswold, Canterbury (0.14 miles only), Plainfield, Killingly, Putnam, and Thompson.

County	Location	mi	km	Destinations	Notes
New London	Groton	0.0	0.0	US 1 north – Groton City	Southern terminus
		0.22	0.35	I-95 south / US 1 south / Route 184 east – New London, Providence, Ledyard	Exit 1 on Route 184
	Ledyard	6.86	11.04	Route 214 east – Ledyard
	Preston	9.08	14.61	Route 2A west to I-395 – Uncasville	Southern terminus of Route 2A overlap
		9.38	15.10	Route 2A east – Hallville	Northern terminus of Route 2A overlap
	Norwich	12.12	19.51	Route 2 west to Route 32 – Hartford	Western terminus of Route 2 overlap
		12.43	20.00	Route 2 east – Stonington	Northern terminus of Route 2 overlap
		15.19	24.45	Route 97 north – Taftville
	Lisbon	19.62	31.58	I-395 – Worcester, New Haven	Exits 21A-B on I-395
		20.43	32.88	Route 138 west – Newent	Southern terminus of Route 138 overlap
	Griswold	20.82	33.51	Route 138 east – Pachaug	Northern terminus of Route 138 overlap
		21.05	33.88	Route 201 south – Hopeville Pond State Park
Windham	Plainfield	27.50	44.26	Route 14A west – Plainfield, Canterbury	Southern terminus of Route 14A overlap
		27.91	44.92	Route 14A east to I-395 – Sterling	Northern terminus of Route 14A overlap
		30.31	48.78	Route 14 east to I-395 – Moosup	Southern terminus of Route 14 overlap
		30.59	49.23	Route 14 west – Canterbury	Northern terminus of Route 14 overlap
		32.12	51.69	Route 205 north – Wauregan, Brooklyn
	Killingly	36.15	58.18	US 6 east to I-395 – Providence	Southern terminus of US 6 overlap
		36.51	58.76	US 6 west – Hartford	Northern terminus of US 6 overlap
		39.46	63.50	Route 101 to I-395 – Dayville, East Killingly
		42.04	67.66	Route 21 north – Putnam Heights
	Putnam	45.58	73.35	US 44 west – Pomfret	Southern terminus of US 44 overlap
		46.02	74.06	Route 171 west – Woodstock
		46.22	74.38	US 44 east to I-395 – East Putnam	Northern terminus of US 44 overlap
	Thompson	48.17	77.52	Route 193 north – Webster, MA
		48.88	78.66	I-395 south – Norwich, New Haven	Exit 49 on I-395
		49.88	80.27	Route 200 east – Thompson
		51.95	83.61	Route 131 west – Quinebaug, Southbridge, MA
		54.46	87.64	Route 12 north – Auburn, Worcester	Continuation into Massachusetts
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Media related to Connecticut Route 12 at Wikimedia Commons

• Route 12 at Connecticut Roads