1. Italy: Over 10 million immigrants
2. Russia: Over 2.5 million immigrants
3. Austria: Over 2 million immigrants
4. Germany: Over 1.5 million immigrants
5. United Kingdom: Over 1 million immigrants
6. Poland: Over 900,000 immigrants
7. Hungary: Over 800,000 immigrants
8. Czechoslovakia: Over 700,000 immigrants
9. Sweden: Over 600,000 immigrants
10. Romania: Over 500,000 immigrants
These figures represent the number of immigrants who arrived at Ellis Island and do not necessarily reflect their country of origin as some may have been in transit to other destinations in the Americas.