As related in A Statistical Account of the County of Middlesex, in Connecticut (1819) by David Dudley Field:
The [Ecclesiastical] Society of Hadlyme was incorporated in Oct. 1742, and was thus called, because it was made partly from East-Haddam and partly from Lyme. The church was organized, with ten male members, on the 26th of June 1745, and on the 18th of the succeeding September, the Rev. Grindall Rawson, who had been minister several years at South-Hadley, Mass. was installed their pastor.
The current church, built in 1840 and located on Town Street (Route 82) in East Haddam, is the second building to be constructed on the site.
Hadlyme Congregational Church (1840)