Onahan Family History

You can see how Onahan families moved over time by selecting different census years. The Onahan family name was found in the USA between 1880 and 1920. The most Onahan families were found in USA in 1880. In 1880 there were 3 Onahan families living in Illinois. This was 100% of all the recorded Onahan's in USA. Illinois had the highest population of Onahan families in 1880.

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