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Where is the O'halloran family from?
You can see how O'halloran families moved over time by selecting different census years. The O'halloran family name was found in the USA, Canada, and Scotland between 1871 and 1920. The most O'halloran families were found in USA in 1880. In 1880 there were 48 O'halloran families living in New York. This was about 22% of all the recorded O'halloran's in USA. New York had the highest population of O'halloran families in 1880.
Use census records and voter lists to see where families with the O'halloran surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.