 After World War I, he served as president of the American Wholesale Coal Association in 1921 and 1922, and as a trustee to settle the affairs of the Tidewater Coal Exchange from 1922 to 1925.Coyle was elected as a Republican to the Sixty-ninth Congress, but was an unsuccessful candidate for reelection in 1926.He was elected to the Seventy-first and Seventy-second Congresses, but was an unsuccessful candidate for reelection in 1932, 1936, and 1942.