What is the oldest ZIP code?

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Tags

1. #voted
2. #lowest
3. #01001
4. #puerto
5. #zoning
6. #adjuntas
7. #00601
8. #states
9. #massachusetts
10. #first
11. #since
12. #number
13. #implemented
14. #agawam
15. #currently
16. #would
17. #answer
18. #which