Countries Beginning with “U”
- U.N. Temporary Excutive Authority, West New Guinea
- Uganda
- Ugandy
- Ukraine
- Umm Al Qiwain
- Umm Al Qwain
- United Arab Emirates
- United Arab Emirates Dubai
- United Nations
- United Nations Geneva
- United Nations Vienna
- United States
- United States - Essay
- United States - Guam
- United States - Hunting Permit Stamps
- United States Postal Agency - Shanghai, China
- United States Postal History -- 20th Century
- United States Postal History -- 19th Century
- United States Postal History -- 20th Century
- United States Postal History -- 20th Century Army Postal Service (A.P.O.)
- United States Postal History -- 20th Century Auxiliary Markings
- United States Postal History -- 20th Century Pre-Cancel
- United States Postal History -- Exposition / World's Fair
- United States Postal History -- First Day Covers (pre-1951) 1931-1940
- United States Postal History -- First Flight / Air Mail Related / Balloons
- United States Postal History -- Flag / Machine Cancels
- United States Postal History -- Flag Cancels
- United States Postal History -- Polar Related
- United States Postal History -- Railroad RPO Cancels
- United States Postal History -- Ship / Paquebot
- United States Postal History -- Ships, USS
- United States Postal History -- Stamped Envelopes and Wrappers
- United States Postal History -- Texas
- United States Postal History -- Texas
- Untied States
- Upper Silesia
- Uraguay
- Uruguay
- Uruguay Postal History
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