 He was a member of the Michigan State House of Representatives in 1894 and 1895 and was again appointed postmaster of West Bay City, serving from October 1, 1898, to June 1902.Due to the vacancy caused by the death of Rousseau O. Crump, Aplin was elected as a Republican from Michigan's 10th congressional district to the United States House of Representatives for the Fifty-seventh Congress.Aplin served from October 15, 1901 to March 3, 1903 and was an unsuccessful candidate for re-nomination in 1902, being defeated by fellow Republican George A.