 By the time of his death, Smith's boats were found on both American coasts, in England, Mexico, and Pacific coast of Asia.Isaac Smith was married to Mary Jane Fearon (April 28, 1893–March 25, 1924) on February 16, 1881, with whom he had one son, William Edgar Smith (September 20, 1882–September 23, 1925) and a daughter Helen E. Smith (July 1888–March 3, 1954).Later he married Ida Baxter, former Postmistress of Port Washington and they were still together when he died at his summer home in North Creek, New York on September 27, 1940, of a heart attack.