Serving from 1791 to 1795 on Boston's board of selectmen, he resigned due to business pressures but returned in 1799. From 1799 to 1817, he was the chairman of Boston's board of selectmen continuously, and served as a paid police superintendent, improving the city's streets, drains, and lighting. Under his direction, both the infrastructure and civic center of Boston were transformed into a dignified, classical style. Bulfinch was responsible for the design of the Boston Common, the remodeling and enlargement of Faneuil Hall (1805), and the construction of India Wharf. In these Boston years, he also designed the Massachusetts State Prison (1803); Boylston Market (1810); University Hall for Harvard University (1813–1814); First Church of Christ, Unitarian in Lancaster, Massachusetts (1815–1817); and the Bulfinch Building, home of the Ether Dome at Massachusetts General Hospital (1818), its completion overseen by Alexander Parris, who was working in Bulfinch's office at the time the architect was summoned to Washington.