Warren is a town in Litchfield County, Connecticut, United States, named after Revolutionary War General Joseph Warren. The first settlements appeared in Warren in 1737, when the community was still a part of the city of Kent. As a separate town, Warren was registered only in 1786, and in 1810 the town became known as an educational center. By this time, the town's population was about 1,100, but due to the decline of agriculture and the local steel industry, most of the townspeople moved out. By the end of the 19th century, Warren's population declined to only 300 residents. According to the 2020 census, the city's population is 1351 people.