Do ZIP codes always have 5 digits?

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Tags

1. #group
2. #block
3. #delivery
4. #identify
5. #identifier
6. #within
7. #individual
8. #digits
9. #receiver
10. #sorting
11. #basic
12. #apartments
13. #geographic
14. #additional
15. #could
16. #volume
17. #digit
18. #segment
19. #extra
20. #other
21. #efficient