O'hollahan Family History

You can see how O'hollahan families moved over time by selecting different census years. The O'hollahan family name was found in the USA in 1880. In 1880 there were 8 O'hollahan families living in California. This was 100% of all the recorded O'hollahan's in USA. California had the highest population of O'hollahan families in 1880.

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