When Cyrus Leroy Foust was born on 19 November 1880, in Rush, Indiana, United States, his father, William Perry Foust, was 32 and his mother, Cynthia Roberts, was 32. He had at least 1 son and 1 daughter with Eunice/Emma Faust/ Van Zandt. He lived in Pipe Creek Township, Madison, Indiana, United States in 1910 and White River Township, Hamilton, Indiana, United States in 1920. He died in 1951, at the age of 71, and was buried in Aroma, White River Township, Hamilton, Indiana, United States.