Postal Authorities
- Canada Post
- United Kingdom
- United States
- Australia
- New Zealand
- Guernsey
- Isle of Man
- Jersey
- Austria
- Belgium
- China
- Croatia
- Cyprus
- Czech Republic
- Denmark
- Faroe Islands
- Finland
- France
- Germany
- Gibraltar
- Greece
- Greenland
- Hungary
- Iceland
- India
- Ireland
- Italy
- Malta
- Netherlands
- Norway
- Poland
- Portugal
- Russia
- Singapore
- South Africa
- Spain
- Sweden
- Switzerland
- United Nations
- World Wildlife Fund