Haddam is a town in Middlesex County, Connecticut, United States. The population was 8,452 at the time of the 2020 census. The town was also home to the now-decommissioned Connecticut Yankee Nuclear Power Plant. History Haddam, in Middlesex County, is located in south-central Connecticut in the lower Connecticut River Valley. It is also home to Cockaponset State Forest. Incorporated in October 1668 as Hadham, It was later renamed Haddam due to people saying Hadham too fast. Haddam is the only town in Connecticut divided by the Connecticut River, and only one of three divided towns along the entire Connecticut River, the other two being Northfield, Massachusetts, and Pittsburg, New Hampshire. Haddam contains five villages: Hidden Lake, Higganum, Shailerville, and Tylerville on the west side of the river, and Haddam Neck on the east. For the first two hundred years of the town's existence, the Connecticut River was a major source of income and transportation. Today, the town of Haddam is a residential community. The town was named for Much Hadham and Little Hadham in Hertfordshire, England, collectively known as The Hadhams. Demographics As of the census of 2000, there were 7,157 people, 2,701 households, and 2,101 families residing in the town. The population density was 162.5 inhabitants per square mile (62.8/km2). There were 2,822 housing units at an average density of 24.7 persons/km2 (64.1 inhabitants/mi2). The racial makeup of the town was 96.86% White, 1.03% African American, 0.11% Native American, 0.82% Asian, 0.03% Pacific Islander, 0.17% from other races, and 0.98% from two or more races. 1.06% of the population were Hispanic or Latino of any race. There were 2,701 households, out of which 34.5% had children under the age of 18 living with them, 68.1% were married couples living together, 6.9% had a woman whose husband does not live with her, and 22.2% were non-families. 18.1% of all households were made up of individuals, and 7.0% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.00. In the town, the population was spread out, with 24.7% under the age of 18, 5.0% from 18 to 24, 30.2% from 25 to 44, 30.4% from 45 to 64, and 9.7% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 102.0 males. For every 100 females