Killingworth is a town located in Middlesex County, in the state of Connecticut (CT), United States. Nestled in the New England division of the North-east region, it covers an area of 35.3 square miles (91.0 km²) and sits at an elevation of 374 ft. With a population of approximately 6,018 residents, Killingworth offers a peaceful, rural atmosphere.
The town's population is composed of about 49.6% males and 50.4% females, and it has a population density of 170.48 people per square mile (65.82/km²). Killingworth lies at a latitude of 41.38 and a longitude of -72.58, operating in the UTC-5.
Locals reflect a blend of American ancestry, with roots primarily in United States (0%), followed by English (21.1%), German (19.2%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 06419.