Thonahan Family History

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

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