Trethowski Family History

You can see how Trethowski families moved over time by selecting different census years. The Trethowski family name was found in the USA in 1920. In 1920 there was 1 Trethowski family living in Illinois. This was 100% of all the recorded Trethowski's in USA. Illinois had the highest population of Trethowski families in 1920.

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