He was also the founder and first proprietor of Colchester, Connecticut, which was established on land owned by Adams, known as "Jeremiah's Farme".

His Inn at Hartford was used as the meeting place for the legislative body of the colony, general court sessions, and for other public purposes.

[9] It may be presumed that among these meetings, was the creation of the famous Fundamental Orders of Connecticut (1639), which was perhaps the western world's first written constitution.

[11][12] On April 5, 1638, he was sent with Captain Mason on an expedition to the Warranocke Indians to trade for corn.

His name is inscribed on the Founders Monument of Hartford at the First Church of Christ and the Ancient Burying Ground.