The origins of the First Congregational Church of Portland go back to 1714 when it known as the Third Society of Middletown, later called Chatham. The areas that are now the town of Portland and East Hampton were incorporated in 1767 as the Town of Chatham. Portland separated from Chatham to become the Town of Portland in 1841. The Society had two earlier church buildings before the current one. As related in the 1884 History of Middlesex County:
At the annual meeting in 1845, difference of opinion prevailed as to the location of the prospective new church, and accordingly a committee, consisting of Deacon Job H. Payne, Philip H. Sellew, and Ebenezer B. White, were appointed to select two or more judicious and disinterested persons as an advisory committee, to consult together and report. The next year, by a vote of nine to fifteen, it was determined to place the new edifice on the old site, but it was decided by the moderator (one of the deacons of the church) to be no vote. At a meeting soon after it was voted thirteen to seven to build on “Meeting House Hill.” This was likewise decided by the same moderator to be no vote. It is presumable that the foregoing decisions were reached by the moderator, in view of the smallness of the number present, the general want of enthusiasm, and possible lack of requisite pledges. Three years elapsed, when, November 6th 1849, it was voted twenty-six to nine, three not voting, that the meeting house should be erected on the lot owned by John I. Worthington, situated between the dwelling houses of Harlord H. Caswell, and George H. Pettis, and William H. Bartlett, Ebenezer B. White, Henry E. Sage, Philip H. Sellew, and Reuben Paynewere appointed a building committee. The present church edifice was built in 1850, and on the 18th of December of the same year was dedicated. It is of Gothic structure, 70 by 39 feet. The building cost $6,200; the site, bell, furniture, and other accommodations, $1,450; total, $7,650.
Henry Austin, of New Haven, was the architect.