O'calahan Family History

You can see how O'calahan families moved over time by selecting different census years. The O'calahan family name was found in the USA in 1880. In 1880 there was 1 O'calahan family living in California. This was about 50% of all the recorded O'calahan's in USA. California and 1 other state had the highest population of O'calahan families in 1880.

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