In the 1790 census for Leverett, Massachusetts, Adam Freeman is listed in the "All Other Free Persons" column and a woman, likely his wife, is listed in the "Free White Females" column. "Adam, a negro" is listed in the 1800 federal census for the town. By then, he lived alone.
Freeman was a common surname for those who were once enslaved but had gained their freedom (although it was also a relatively common last name for White people, as well.) It is unknown whether this was the case for Adam's parents, or for himself.