901 selected
- Kosovo
- Kouang-Tcheou
- Kuwait
- Kyrgyzstan
- Kyrgyzstan - Illegal Stamps
- La Agüera
- Labuan
- Lagos
- Laos
- Laos - Pathet Lao
- Lattakia
- Latvia
- Lebanon
- Leeward Islands
- Lesotho
- Levant [Austro-Hungarian post offices in Turkey]
- Levant [British postoffices in Turkey]
- Levant [French post offices in Turkey]
- Levant [German post offices in Turkey]
- Levant [Italian post offices]
- Levant [Polish post office in Turkey]
- Levant [Rumanian post offices in Turkey]
- Levant [Russian post offices]
- Liberia
- Libya
- Libya - Italian post office Benghazi
- Liechtenstein
- Lithuania
- Lombardy–Venetia
- Lourenço Marques
- Lübeck
- Luxembourg
- Macau
- Madagascar
- Madagascar (British post)
- Madagascar - Illegal Stamps
- Madeira
- Mahra
- Malawi
- Malawi - Illegal Stamps
- Malaysia
- Malaysia - Federal territory
- Malaysia - Johore
- Malaysia - Kedah
- Malaysia - Kelantan
- Malaysia - Malacca
- Malaysia - Negeri Sembilan
- Malaysia - Occupation by Japan
- Malaysia - Pahang
- Malaysia - Penang
- Malaysia - Perak
- Malaysia - Perlis
- Malaysia - Sabah
- Malaysia - Sarawak
- Malaysia - Selangor
- Malaysia - Sungei Ujong
- Malaysia - Trengganu
- Malaysia [1900-1963] - Federation Malaya
- Maldives
- Mali
- Mali - Illegal Stamps
- Malta
- Maluku Selatan (South Maluku - Cinderella)
- Man
- Man - Calf of Man - Cinderella
- Manchukuo
- Marienwerder
- Marshall Islands
- Martinique
- Mauritania
- Mauritius
- Mayotte
- Mecklenburg-Schwerin
- Mecklenburg-Strelitz
- Memel
- Mexico
- Micronesia
- Middle Congo
- Mohéli
- Moldova
- Moldova - Gagauzia - Illegal Stamps
- Monaco
- Mongolia
- Montenegro
- Montenegro - Cinderella
- Montserrat
- Morocco
- Morocco - British post offices
- Morocco - French post offices
- Morocco - German post offices
- Morocco - Spanish post offices
- Morocco [1956-1957] - North Zone
- Mozambique
- Mozambique - Companhia de Moçambique
- Mozambique - Illegal Stamps
- Myanmar (Burma)
- Nagorno-Karabakh
- Namibia
- Natal
- Nauru
- Nepal
- Netherlands
- Netherlands Antilles
- Netherlands East Indies - Occupation by Japan
- Netherlands New Guinea
- Nevis
- New Brunswick
- New Caledonia
- New Guinea
- New Hebrides
- New South Wales
- New Zealand
- Newfoundland
- Niassa
- Nicaragua
- Niger
- Niger Coast
- Nigeria
- Niuafo'ou
- Niue
- Norfolk
- North Borneo
- North German Postal Area
- North Ingria
- North Korea
- North Macedonia
- North Rhodesia
- Northern Cyprus - Turkish Republic
- Northern Nigeria
- Norway
- Norway - Jul stamps
- Nosy Be
- Nova Scotia
- Obock
- Oldenburg
- Oman
- Oman - Dhofar - Illegal Stamps
- Oman [State of] - Illegal Stamps
- Orange Free State
- Oubangui-Chari
- Pakistan
- Palau
- Palestine
- Palestine - Illegal Stamps
- Panama
- Panama Canal Zone
- Papua New Guinea
- Paraguay
- Penrhyn
- People's Democratic Republic of Yemen - PDR (South Yemen [1967-1990])
- Persia (Iran)
- Peru
- Philippines
- Philippines - Occupation by Japan
- Pitcairn
- Poland
- Poland [1915-1923] - Local postal areas
- Poland [1946] - Occupation of Italy
- Ponta Delgada
- Port Lagos
- Port-Said
- Portugal
- Portuguese Africa
- Portuguese Congo
- Portuguese Guinea
- Portuguese India
- Prince Edward Island
- Prussia
- Puerto Rico
- Qatar
- Qu'aiti State in Hadhramaut
- Queensland
- Quelimane
- Rarotonga
- Ras al-Khaimah
- Réunion
- Rhineland-Palatinate - French Zone
- Rhodesia
- Rhodesia and Nyasaland
- Rio de Oro
- Rio Muni
- Romania
- Romania - Cinderella
- Romania - Occupation of Hungary Cluj
- Romania - Occupation of Hungary Debreczen
- Romania - Occupation of Hungary Oradea
- Romania - Occupation of Ukraine
- Ross Dependency
- Ross Dependency - King Edward VII Land
- Rouad
- Ruanda-Urundi
- Rumania - Occupation of Temesvár
- Russia [1857-1917]
- Russia [1866-1919] - Zemstvo
- Russia [1918-1923]
- Russia [1918-1923] - Civil war zones
- Russia [1920-1922] - Far Eastern Republic
- Russian Federation
- Russian Federation - Altai - Illegal Stamps
- Russian Federation - Amur Oblast - Illegal Stamps
- Russian Federation - Bashkortostan - Illegal Stamps
- Russian Federation - Buryatia - Illegal Stamps
- Russian Federation - Chechnya - Illegal Stamps
- Russian Federation - Chuvashia - Illegal Stamps
- Russian Federation - Dagestan - Illegal Stamps
- Russian Federation - Ingushetia - Illegal Stamps
- Russian Federation - Jewish Autonomous Oblast - Cinderella
- Russian Federation - Kalmykia - Illegal Stamps
- Russian Federation - Kamchatka - Illegal Stamps
- Russian Federation - Karelia - Illegal Stamps
- Russian Federation - Komi - Illegal Stamps
- Russian Federation - Mordovia - Illegal Stamps
- Russian Federation - North Ossetia–Alania - Illegal Stamps
- Russian Federation - Sakha - Illegal Stamps
- Russian Federation - South Ossetia - Illegal Stamps
- Russian Federation - Tatarstan - Illegal Stamps
- Russian Federation - Udmurtia - Illegal Stamps
- Rwanda
- Rwanda - Illegal Stamps
- Ryukyu Islands
- S.C.A.D.T.A
- Saar (1920-1935)
- Saarland
- Saint Christopher-Nevis-Anguilla
- Saint Helena
- Saint Kitts
- Saint Lucia
- Saint Martin
- Saint Vincent and the Grenadines
- Saint-Pierre and Miquelon
- Sainte-Marie de Madagascar
- Samoa
- Samos
- San Marino
- Sao Tome and Principe
- Saudi Arabia
- Saxony
- Schleswig-Holstein
- Sealand - Cinderella
- Senegal
- Senegambia and Niger
- Serbia
- Serbia - Occupation of Banat-Backa
- Serbia - Occupation of Baranya
- Serbia - Occupation of Temesvar
- Serbia and Montenegro
- Seychelles
- Seychelles - Zil Eloigne Sesel
- Shanghai
- Sharjah
- Not filled in