World Stamp Catalogue/U
U
edit- Uganda
- Ukraine
- Umm Al Qiwain
- United Arab Emirates
- United Kingdom, Great Britain
- United Kingdom, Great Britain Offices Abroad
- United Kingdom, Guernsey
- United Kingdom, Isle of Man
- United Kingdom, Jersey
- United Kingdom, Lundy
- United Nations
- United States of America
- Upper Senegal & Niger
- Upper Silesia
- Upper Volta
- Upper Volta
- Uruguay
- US Post Abroad
- USSR
- Uzbekistan