When Karl William Farnsworth was born in January 1886, in Oregon, United States, his father, Orrin Edward Farnsworth Jr, was 39 and his mother, Catherine Margaret Pray, was 35. He married Charlotte Cora Wilson on 10 September 1911, in Monument, Grant, Oregon, United States. They were the parents of at least 1 son and 2 daughters. He lived in Gilliam, Oregon, United States in 1920 and Enterprise, Wallowa, Oregon, United States in 1930. He died on 7 September 1961, in The Dalles, Wasco, Oregon, United States, at the age of 75, and was buried in The Dalles, Wasco, Oregon, United States.