When Jacob Rush Halladay was born on 1 April 1866, in Indiana, United States, his father, Vincent Grant Halladay, was 30 and his mother, Martha J Shellebarger, was 24. He married Margaret Baker on 3 June 1897. They were the parents of at least 3 sons and 2 daughters. He lived in Wabash Township, Darke, Ohio, United States in 1880 and Wabash, Mercer, Ohio, United States in 1910. He died on 27 September 1944, in Washington Township, Darke, Ohio, United States, at the age of 78, and was buried in Greenville Union Cemetery, Greenville, Darke, Ohio, United States.