He married Frances Rowena Mayo, the daughter of Oren Mayo and Deborah J. Spencer, of Louisiana. Her father moved from Watertown, N. Y., to Louisiana, about 1840. Frances Rowena Mayo descended from Revolutionary parentage. Her grandfather was an officer in the War of 1812, and his grandfather in the Revolution. The family emigrated from England, not exactly on the Mayflower, but very soon thereafter. Her grandfather on her mother's side — George Spencer — was a Virginian, whose father was also an officer in the Revolutionary army. One of his sisters was the wife of General Lewis Cass and another of General Hunt, of Toledo, Ohio. Her father, Judge Oren Mayo, filled a number of offices in the State of Louisiana, having been successively Member of the State Legislature, State Senator, and for many years District and Circuit Judge. One of her uncles, Judge W. B. Spencer, was a Member of Congress from the Fifth District of Louisiana, and afterward one of the Associate Justices of the Supreme Court of Louisiana. Frances Rowena Mayo married Hon. C. J. Boatner on the 27th of
December, 1870. They had five children — four sons and one daughter, Annie Josephine Boatner.[1]
Boatner was elected as a Democrat to the Fifty-first, Fifty-second, and Fifty-third Congresses (March 4, 1889 – March 3, 1895).
Presented credentials as a Member-elect to the Fifty-fourth Congress but on March 20, 1896, the House declared the seat vacant, the election having been contested by Alexis Benoit.
Boatner was elected to fill the vacancy caused by the House declaring the seat vacant and served from June 10, 1896, to March 3, 1897. He declined to be a candidate for reelection in 1896. Instead he moved to New Orleans to resume the practice of law. He died there on March 21, 1903, and is interred at Monroe Cemetery, in Monroe, Louisiana.