Freeman promoted Unitarianism outside the Stone Chapel as well. He donated to libraries tracts that had been sent to him by Lindsey. In 1792 a Unitarian congregation was formed in Portland, in the district of Maine, by an Episcopalian minister and friend of Freeman, Thomas Oxnard, to whom Freeman had given books by Lindsey and Priestley. His preaching in Baltimore in 1816 led to the organization of the Unitarian church there, at which William Ellery Channing gave his famous 1819 sermon. He met every two weeks with about twenty liberal ministers in the Boston area, mostly Congregational, for discussions relating to religion, morals, and civic order. Freeman was appointed to a committee charged with considering the creation of a formal body. The work of this committee led, in 1825, to the founding the American Unitarian Association.