Until 1650, the area of East Haddam was inhabited by at least three tribes of Indians: the Wangunks, the Mohegans and the Nehantics. The Indians called the area “Machimoodus,” the place of noises, because of numerous earthquakes that were recorded between 1638 and 1899. Loud rumblings, the “Moodus Noises,” could be heard for miles surrounding the epicenter of the quakes near Mt. Tom. The land, which is now Haddam and East Haddam, was purchased by settlers from the Indians in 1662 for thirty coats – worth about $100.

Layout of the highways began in 1669 with Creek Row about ¼ mile east of the River and Town Street “The Great Highway” about ¼ mile east of Creek Row. The first permanent settlers established homesteads along Creek Row in 1685. By 1700, there were thirty families living in East Haddam. Agricultural and timber farming, shipbuilding, tanneries and blacksmiths were among the early commerce. Captain John Chapman began ferry service across the Connecticut River in 1695, which ended with the completion of the swing bridge in 1913.

East Haddam was incorporated as a separate town from Haddam in 1734. By 1756, there were nearly 2,000 residents, with the Millington District as the most populated. Growth of commerce brought a surge in population to around 3,000 people by the mid-1800s. In the nineteenth century, Moodus was the “Twine Capital of America,” with twelve mills in operation. Visitors and residents such as actor, William Gillette, whose castle home was completed in 1914, were drawn to the area known for its rural charm and natural scenery. The growth of the resort areas of Lake Hayward, Bashan Lake and Moodus Reservoir began in the early 1900s and was a booming business for the next fifty years.

According to the United States Census Bureau, the town has a total area of 56.6 square miles (147 km²), of which, 54.3 square miles (141 km²) of it is land and 2.2 square miles (5.7 km²) of it (3.96%) is water.

As of the census of 2000, there were 8,333 people, 3,174 households, and 2,285 families residing in the town. The population density was 153.4 people per square mile (59.2/km²). There were 4,015 housing units at an average density of 73.9 per square mile (28.5/km²). The racial makeup of the town was 97.26% White, 0.84% African American, 0.28% Native American, 0.40% Asian, 0.46% from other races, and 0.77% from two or more races. Hispanic or Latino of any race were 0.98% of the population.

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Wikipedia