What are the first three digits of a ZIP code called?

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Tags

1. #within
2. #groups
3. #large
4. #these
5. #digit
6. #united
7. #northeast
8. #states
9. #second
10. #third
11. #identified
12. #average
13. #divided
14. #divides
15. #geographical
16. #first
17. #areas
18. #state
19. #smaller
20. #numbered
21. #digits