What is zip field?

Related questions

1. Are ZIP codes mandatory?
2. Do ZIP codes always have 5 digits?
3. What's my country code?
4. Is Zip 4 required?
5. Why is zip code called ZIP code?
6. How do postcodes work in UK?
7. How do I find the last 4 digits of my zip code?
8. Is ZIP code one word or two?
9. Is it safe for tourists in Moscow?
10. How many 5 digit zip codes are there in the US?

Tags

1. #established
2. #location
3. #which
4. #routing
5. #postal
6. #detailed
7. #identifying
8. #digits
9. #expanded
10. #identification
11. #originally
12. #purposes
13. #states
14. #service
15. #united