When Dietrich Anton Oltman was born on 4 February 1871, in San Jose, Logan, Illinois, United States, his father, Anton Oltmanns, was 28 and his mother, Catherine Rademacher, was 21. He married Anna Louisa Hobelman on 30 June 1892, in Clatonia, Gage, Nebraska, United States. They were the parents of at least 3 sons and 5 daughters. He lived in Clatonia Township, Gage, Nebraska, United States in 1900 and Highland Township, Gage, Nebraska, United States for about 10 years. He died on 24 October 1936, in Lincoln, Nebraska, United States, at the age of 65, and was buried in Lincoln, Lancaster, Nebraska, United States.