O'hallahan Family History

You can see how O'hallahan families moved over time by selecting different census years. The O'hallahan family name was found in the USA in 1880. In 1880 there was 1 O'hallahan family living in Illinois. This was about 33% of all the recorded O'hallahan's in USA. Illinois and 2 other states had the highest population of O'hallahan families in 1880.

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