Born in Woonsocket, Rhode Island, McAndrews attended the common schools. He moved to Chicago, Illinois, and engaged in business, serving as building commissioner of Chicago.
McAndrews was elected as a Democrat to the Fifty-seventh and Fifty-eighth Congresses (March 4, 1901 – March 3, 1905).[1] He was then elected to the Sixty-third and to the three succeeding Congresses (March 4, 1913 – March 3, 1921).
He was an unsuccessful candidate for reelection in 1920 to the Sixty-seventh Congress, and instead resumed his business activities.
He was also an unsuccessful candidate for election in 1932 to the Seventy-third Congress.