You can see how Horthrop families moved over time by selecting different census years. The Horthrop family name was found in the USA, and Scotland between 1871 and 1920. The most Horthrop families were found in USA in 1920. In 1920 there was 1 Horthrop family living in California. This was about 25% of all the recorded Horthrop's in USA. California and 3 other states had the highest population of Horthrop families in 1920.

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