Connecticut State Route 12 is a north-south highway in Eastern Windham County. It runs from the Windham/New London County Line, near Plainfield, to the Massachusetts/Connecticut State Line, near Wilsonville. CT St Rt 12 passes through the following towns in Windham County. Packerville Plainfield Central Village Danielson Elmville Attawaugan Putnam Mechanicsville Grovenor Dale North Grosvenor Dale Wilsonville CT St Rt 12 is multi-plexed in Windham County. Connecticut State Route 14, near Central Village. U.S. Rt. 6, at Danielson.
U.S. Rt. 44, at Putnam. CT St Rt 12 crosses the following highways in Windham County. Connecticut State Route 14A, at Plainfield. Connecticut State Route 14, at Central Village. Connecticut State Route 14, at Central Village. Connecticut State Route 205, near Central Village. U.S. Rt. 6, at Danielson. U.S. Rt. 6, at Danielson.
Interstate 395, near Elmville. (NO Interchange) Connecticut State Route 101, near Elmville. Connecticut State Route 21, near Putnam. Interstate 395, near Putnam. (NO Interchange) U.S. Rt. 44, at Putnam. U.S. Rt. 44, at Putnam. Connecticut State Route 193, near Putnam. Connecticut State Route 200, at North Grosvenor Dale. Connecticut State Route 131, at North Grosvenor Dale.
A junction marker on WB U.S. Rt. 6. A BGS on WB U.S. Rt. 6. WB U.S. Rt. 6/NB CT St Rt 12 in Danielson. A BGS on EB U.S. Rt. 6.
