Hadley was elected as a Republican to the Fifty-fourth Congress to fill the vacancy caused by the death of Frederick Remann and served from December 2, 1895, to March 3, 1897. He was an unsuccessful candidate for reelection in 1896. He engaged in banking. He died in Riverside, California, April 25, 1901. He was interred in Woodlawn Cemetery, Edwardsville, Illinois.