Connecticut Route 12

Route 12 marker
Route 12
Map
Map of eastern Connecticut with Route 12 highlighted in red
Route information
Maintained by CTDOT
Length54.46 mi[1] (87.64 km)
Existed1922–present
Major junctions
South end I-95 / US 1 / Route 184 in Groton
Major intersections
North end Route 12 at Dudley, MA
Location
CountryUnited States
StateConnecticut
CountiesNew London, Windham
Highway system
  • Connecticut State Highway System
Route 11 Route 14
Route 11N.E. Route 12A

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