You can see how Jahannsen families moved over time by selecting different census years. The Jahannsen family name was found in the USA in 1920. In 1920 there was 1 Jahannsen family living in Ohio. This was 100% of all the recorded Jahannsen's in USA. Ohio had the highest population of Jahannsen families in 1920.

Use census records and voter lists to see where families with the Jahannsen surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.