Map of Windham County in northeastern Connecticut with Route 21 highlighted in red
Route information
Maintained by CTDOT
Length
5.67 mi[1] (9.12 km)
Existed
1944–present
Major junctions
South end
Route 12 in Killingly
Major intersections
US 44 in East Putnam
North end
Route 193 in Thompson
Location
Country
United States
State
Connecticut
Counties
Windham
Highway system
Connecticut State Highway System
Interstate
US
State
SSR
SR
Scenic
← Route 20
→ Route 22
Route 21 is a 5.67-mile (9.12 km) state highway in rural northeastern Connecticut. It extends from Route 12 in Killingly to Route 193 in Thompson. It serves as an alternate to Route 12 in the town of Putnam.
^Connecticut State Highway Log Archived 2015-09-05 at the Wayback Machine
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