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Where is the O'neil family from?
You can see how O'neil families moved over time by selecting different census years. The O'neil family name was found in the USA, the UK, Canada, and Scotland between 1841 and 1920. The most O'neil families were found in USA in 1880. In 1880 there were 2,061 O'neil families living in New York. This was about 24% of all the recorded O'neil's in USA. New York had the highest population of O'neil families in 1880.
Use census records and voter lists to see where families with the O'neil surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.