Killingly, Connecticut

Killingly, Connecticut
Town of Killingly
Killingly Town Hall
Interactive map of Killingly, Connecticut
Coordinates: 41°49′53″N 71°51′01″W / 41.83139°N 71.85028°W / 41.83139; -71.85028
Country United States
U.S. state Connecticut
CountyWindham
RegionNortheastern CT
Incorporated1708
Government
 • TypeCouncil-manager
 • Town managerBrian Palaia
 • Council chairmanEd Grandelski
Area
 • Total
50.0 sq mi (129.5 km2)
 • Land48.5 sq mi (125.7 km2)
 • Water1.5 sq mi (3.8 km2)
Elevation
449 ft (137 m)
Population
 (2020)
 • Total
17,752
 • Density366/sq mi (141.2/km2)
Time zoneUTC-5 (Eastern)
 • Summer (DST)UTC-4 (Eastern)
ZIP code
06239, 06241, 06243
Area codes860/959
FIPS code09-40500
GNIS feature ID0213447
Websitewww.killinglyct.gov
Historical population
CensusPop.Note
18202,803
18403,685
18504,54323.3%
18604,9268.4%
18705,71216.0%
18806,92121.2%
18907,0271.5%
19006,835−2.7%
19106,564−4.0%
19208,17824.6%
19308,8528.2%
19409,5477.9%
195010,0154.9%
196011,29812.8%
197013,57320.1%
198014,5197.0%
199015,8899.4%
200016,4723.7%
201017,3705.5%
202017,7522.2%
US Decennial Census

Killingly is a town in Windham County, Connecticut, United States. Killingly is the largest town by population in the Northeastern Connecticut Planning Region. The population was 17,752 at the 2020 census. It consists of the borough of Danielson and the villages of Attawaugan, Ballouville, Dayville, East Killingly, Rogers, and South Killingly.