Index - U
| uganda | Country.Identifier |
| ukraine | Country.Identifier |
| unitedArabEmirates | Country.Identifier |
| unitedKingdomOfGreatBritainAndNorthernIreland | Country.Identifier |
| unitedStatesMinorOutlyingIslands | Country.Identifier |
| unitedStatesOfAmerica | Country.Identifier |
| uruguay | Country.Identifier |
| uzbekistan | Country.Identifier |