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Where is the O'callahan family from?
You can see how O'callahan families moved over time by selecting different census years. The O'callahan family name was found in the USA between 1880 and 1920. The most O'callahan families were found in USA in 1880. In 1880 there were 49 O'callahan families living in New York. This was about 24% of all the recorded O'callahan's in USA. New York had the highest population of O'callahan families in 1880.
Use census records and voter lists to see where families with the O'callahan surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.