Regions of Origin for Categorizing Immigrants
| 1. | Other North America |
| 2. | Central America |
| 3. | Caribbean |
| 4. | South America |
| 5. | Northern Europe |
| 6. | United Kingdom and Ireland |
| 7. | Western Europe |
| 8. | Southern Europe |
| 9. | Central / Eastern Europe |
| 10. | Baltic States |
| 11. | East Asia |
| 12. | Southeast Asia |
| 13. | India / Southwest Asia |
| 14. | Middle East/Asia Minor |
| 15. | Africa |
| 16. | Oceania (plus Antarctica and abroad unknown) |
Notes: Regions of immigrant origins in the U.S. Census. These are aggregations of country of birth given by the IPUMS variable BPL (birthplace). See Ruggles et al. (2010) for more information.