Dayville is a census-designated place (CDP) in the northeast part of the town of Killingly in Windham County, Connecticut, United States. It is located on the east side of the Fivemile River, north of Danielson. Interstate 395 passes through the east side of the CDP, leading south to Norwich and north to Auburn, Massachusetts.
Dayville was first listed as a CDP prior to the 2020 census.
The Dayville Historic District occupies at the center of the village.
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