Fay represented Chelsea in the Massachusetts General Court from 1834 to 1836 and in 1840, and served in the State Senate 1843–1845 and again in 1848.
Fay was a public servant who held various positions in the Massachusetts government, including representing Chelsea in the General Court from 1834 to 1836 and in 1840, as well as serving in the State Senate between 1843 and 1845, and once more in 1848.