What is a valid postcode format?

Related questions

1. Is Zip 4 required?
2. How many 5 digit zip codes are there in the US?
3. Do ZIP codes always have 5 digits?
4. Is tap water safe in Moscow?
5. What is zip field?
6. What do the first 3 digits of a ZIP code mean?
7. How do postcodes work in UK?
8. Is it safe for tourists in Moscow?
9. How do I find the last 4 digits of my zip code?
10. Are ZIP codes mandatory?

Tags

1. #different
2. #consists
3. #which
4. #royal
5. #combination
6. #between
7. #define
8. #website
9. #postcodes
10. #located
11. #valid
12. #geographic
13. #seven
14. #royalmail
15. #letters
16. #postcode
17. #parts
18. #finder
19. #numbers
20. #levels