- July 29
- Italy issues first postage stamps for use in Oltre Guiba, using overprints of Italy. [1135] [1367.1560]
1926
- February
- The Kingdom of Hejaz-Nejd issues its first postage stamps. [1135]
- April 21
- Italy issues first non-overprint postage stamps for use in Oltre Giuba, depicting a map of the island. [1367.1560]
- June 1
- The Italian Colony of Cyrenaica issues its own first postage stamps. [707.705]
- Italy issues last postage stamps for use in Oltre Giuba. [1367.1560]
- (month unknown)
- Algeria issues its first postage stamps. [700.337]
- The Kingdom of Yemen issues its first postage stamps. [285.1074]
- Tannu Tuva issues its first postage stamps, depicting the Wheel of Truth. [285.414]
- France issues first non-overprint postage stamps for use in the Territory of Niger. [1367.1450]
- October
- Tuva issues its first postage stamps. [1135]
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1927
- January 1
- Saudi Arabia joins the Universal Postal Union. [1135]
- June 1
- The United Kingdom issues first non-overprinted postage stamps for use in Palestine under British administration. [278.58] [1135]
- (month unknown)
- First specific Transjordan postage stamps issued. [1367.120]
- First postage stamps of the Republic of Lebanon issued, as overprints on Grand Liban stamps. [1367.425]
- July 1
- Republic of Lebanon issues its first postage stamps under League of Nations mandate to France. [1135]
1928
- March 28
- The first postage stamps for Andorra under Spanish control are issued, using overprinted stamps of Spain. [700.371] [1135]
- April 1
- Afghanistan joins the Universal Postal Union. [1135]
- (month unknown)
- Canal Zone issues its own first postage stamps. [700.191]
- Upper Volta issues its first postage stamps. [700.1239]
- Spain issues first non-overprinted postage stamps for use in Spanish Morocco. [285.177]
1929
- April 22
- Iraq joins the Universal Postal Union. [1135]
- June 1
- Vatican City joins the Universal Postal Union. [1135]
- (month unknown)
- Last postage stamps are issued for Penrhyn Island (Stamps of Cook Islands are used 1932-1973). [278.175]
- August 1
- Vatican City issues its first postage stamps, denominated 5 centime through 10 lira, depicting crossed keys emblem and Pope Pius XI. [285.910] [1135]
- November 1
- Lundy Island, part of the British Isles, issues its own postage stamps to pay for private mail delivery for the island. [1] [962.909] [993.843] [1135]
- November 25
- Andorra (Spanish administration) issues its first postage stamps. [700.371] [1135]
1930
- January 1
- Yemen joins the Universal Postal Union. [1135]
- February 11
- The Republic of Lebanon issues its own first postage stamps. [1367.425]
- March 31
- In the United Kingdom, all postage stamps issued under King Edward VII cease to be valid for postage. [1154.938]
- (month unknown)
- The last postega stamps for the Alaouites are issued. [700.293]
1931
- March 5
- South West Africa issues its own first postage stamps. [1135]
- April 1
- Indian feudatory state of Morvi issues its first postage stamps. [1135]
- April 13
- France issues first non-overprinted postage stamps for use in Wallis and Futuna Islands. [285.1049]
- June 16
- The first postage stamps for Andorra under French control are issued, using overprinted stamps of France. [700.379] [1135]
- (month unknown)
- Upper Volta issues last postage stamps (until 1959). [700.1239]
- Chad issues its first postage stamps, and its last as a French colony. [707.185]
- Morvi State of India issues its first postage stamps. [1841.941]
- First non-overprint postage stamps are issued for use in South West Africa. [285.83]
- The United Kingdom issues last postage stamps for use in Tanganyika. [285.414]
- France issues last postage stamps for Ubangi-Chari. [285.759]
- First non-overprint postage stamps are issued for use in Ruanda-Urundi. [278.577]
- July
- Latakia issues its first postage stamps. [1135] [1367.411]
- November 12
- Last postage stamps issued for Rarotonga. [707.528]
1932
- March 16
- Resumption of Cook Islands postage stamps bearing that name, since 1919. [707.528] [1135]
- April 1
- Iraq issues its first postage stamps as an independent kingdom. [1135] [1841.1061]
- April 7
- First postage stamps are issued for use in Inini, overprints on French Guiana. [1135] [1841.933]
- June 16
- French administration of Andorra issues its own first postage stamps. [700.379] [1135]
- (month unknown)
- Castellorizo issues its last postage stamps. [707.130]
- Italy issues first non-overprint postage stamps for use in Italian Somalia. [285.17]
- July 11
- Italy issues first postage stamps for use in all of its colonies, overprinted Italian stamps. [1841.1164]
- July 26
- Manchukuo issues its first postage stamps. [1135] [1367.824]
- December 12
- Bechuanaland Protectorate issues its first postage stamps. [700.796]
1933
- January 2
- The United Kingdom resumes issuing postage stamps for use in Swaziland, depicting King George V. [285.255] [1135]
- (month unknown)
- Last postage stamps are issued for Latakia. [1367.411]
- France issues last postage stamps labelled for use in the colony of Middle Congo. [1367.985]
- August 10
- First stamps of Bahrain are issued, using stamps of India overprinted "BAHRAIN". [700.739] [1135]
- December 1
- Basutoland issues its first postage stamps. [700.793] [1135]
1934
- January 1
- The Kingdom of Saudi Arabia issues its first postage stamps. [278.1022] [1135]
- February 10
- Byrd souvenir sheet issued, New York City; first unperforated ungummed US stamp. [1]
- June 5
- Italy issues last postage stamps for use in all of its colonies. [1841.1165]
- (month unknown)
- Last stamps of the Federated Malay States are issued. [1367.693]
- Tibet issues its last postage stamps. [285.501]
- August 2
- The Republic of Syria issues its first postage stamps. [285.356] [1135]
- October
- Italy issues last postage stamps for use in Italian Somalia. [285.17]
- October 16
- Italy issues first non-overprinted postage stamps for use in Tripolitania. [285.597]
- November 1
- Last postage stamps are issued for use in the Saar under administration of the League of Nations. [278.767]
- November 5
- Italy issues last postage stamps for use in Tripolitania. [285.598]
1935
- February 15
- The Philippines issues its last set of postage stamps as a United States territory. [797.22]
- February 21
- Last postage stamps are issued using the name Persia. [1841.1002]
- March 1
- Saar issues its last stamps, as it joins Germany. [1135]
- May 1
- First joint stamp issue for Kenya, Tanganyike, and Uganda. [1135]
- May
- First postage stamps inscribed "Kenya Uganda Tanganyika" are issued. [1367.166]
- (month unknown)
- Bijawar State of India issues its first postage stamps. [1841.929]
- July 1
- Indian feudatory state of Bijawar issues its first postage stamps. [1135]
- August 7
- The USA issues first postage stamps for use in Western Samoa. [278.968] [1135]
- December 1
- Austria has world's first Day of Postage Stamp. [1]
1936
- March 16
- France issues first postage stamps for use in French Equatorial Africa, using overprints of Gabon. [1135] [1843.1293]
1937
- February 28
- Postage stamps of Latakia are withdrawn, as area begins use of stamps of Syria. [1135]
- April 1
- First postage stamps for Burma are issued, using stamps of India overprinted "BURMA". [700.1266] [1135]
- Aden becomes British crown colony, and issues its first postage stamps. [1] [700.248] [1135] [1377.1]
- April 15
- France issues first non-overprint postage stamps for use in French Equatorial Africa. [1135] [1843.1293]
- May 14
- Australia issues last postage stamps for the Territory of Papua. [278.94]
- May 18
- Australia issues last postage stamps for use in New Guinea. [1367.1349]
- (month unknown)
- Austria issues its last postage stamps (until 1945). [700.636]
- Bijawar State of India issues its last postage stamps. [1841.930]
1938
- February 7
- Italy issues first postage stamps for use in Italian East Africa. [1135] [1841.1165]
- April 14
- First postage stamps for Alexandretta under French control are issued, using overprinted stamps of Syria. [700.337]
- (month unknown)
- Burma issues its first postage stamps. [700.1267]
- Barwani State of India issues its last postage stamps. [1841.927]
- October 31
- Last day of validity of Austrian stamps. [1135]
- November 1
- First stamps are issued for Greenland, depicting Danish King Christian X. [1841.455]
- November 10
- The last postage stamps for Alexandretta are issued. [700.337]
- November 15
- Burma issues its own first postage stamps. [1135]
- December 1
- Greenland Post Office becomes a member of the Universal Postal Union. [1226.105]
- Greenland issues its first non-parcel postage stamps. [1135]
- Year
- About 2550-2600 different postage stamps were produced worldwide during the year. [500.XX6]
1939
- January 18
- Slovakia issues its first postage stamps, using overprinted stamps of Czechoslovakia. [278.1164] [1135]
- February 21
- Indian feudatory state of Idar issues its first postage stamps. [1135]
- March 15
- Carpatho-Ukraine issues its first and only postage stamps. [1135]
- April 23
- Czechoslovakia issues its last postage stamps (until 1945). [1843.695]
- April 29
- Danzig issues its last postage stamps. [1843.779]
- May 10
- France issues last postage stamps for use in Niger (until 1959). [1367.1450]
- Last postage stamps are issued for use in Inini. [1841.933]
- July 15
- Germany issues first postage stamps for the Protectorate of Bohemia and Moravia, overprints of Czechoslovakia stamps. [1135] [1843.760]
- August 1
- Poland issues its last postage stamps (until 1944). [278.315]
1940
- February 8
- Niger issues its first postage stamps. [1135]
- May 13
- Thailand issues its first postage stamps with its new country name. [1419.4]
- (month unknown)
- Latvia issues its last postage stamps as it is incorporated into the USSR (until independence in 1991). [1367.413]
- Lithuania issues its last postage stamps as it is incorporated into the USSR (until independence in 1990). [1367.566]
- Orchha State of India issues its last postage stamps. [1841.942]
- July 30
- Estonia issues its last postage stamps (until 1991). [1843.1042]
- August 1
- Responsibility for Estonia postal services is transferred to Moscow. [1132.288]
- August 7
- Largest amount paid for a postage stamp (US$45,000 for 1-cent 1856 British Guiana). [1]
- August 15
- Estonia issues its last postage stamps as independent country. [1135]
- September 29
- The Kingdom of Yugoslavia issues its last postage stamps. [285.1097]
- October 15
- The United Kingdom issues first postage stamps for use in the Pitcairn Islands. [278.302] [1135]
- December 10
- First postage stamps for Northern Epirus using Greek stamps overprinted (in Greek) "Greek Administration". [984.249]
1941
- January 31
- Estonia postage stamps are demonetized. [1132.288] [1135]
- March 1
- Last postage stamps for Northern Epirus using Greek stamps overprinted (in Greek) "Greek Administration". [984.250]
- April 12
- Croatia issues its first postage stamps. [707.575] [1135]
- June 19
- Italy issues last postage stamps for use in Italian East Africa. [1841.1165]
- (month unknown)
- Finnish military administration issues postage stamps for use in occupied Eastern Karelia. [1367.145]
- Spain issues first postage stamps for use in Ifni, overprints of Spanish stamps. [1841.849]
- France issues its last postage stamps for use in Mauritania. [1367.849]
1942
- March 23
- Ethiopia resumes issuing its own postage stamps. [1168.213]
- (month unknown)
- The Kathiri State of Seigun of Aden issues its first postage stamps. [700.248]
- The Quaiti State of Shihrand and Mukalla of Aden issues its first postage stamps. [700.249]
- Jasdan State of India issues its only postage stamps. [1841.939]
- The United Kingdom issues last postage stamps for use in Palestine under British administration. [278.58]
- July
- The Kathiri State of Seiyun issues its first postage stamps. [1135]
- The Qu'aiti State of Shihr and Mukalla issues its first postage stamps. [1135]
- September 18
- Lebanon issues its first postage stamps as an independent state. [1135]
- October 19
- Last postage stamps are issued for use in French Sudan. [1843.1356]
1943
-
- Last postage stamps for use in Jind State of India are issued. [1841.923]
- Spain issues first non-overprint postage stamps for use in Ifni. [1841.849]
- Charkhari State of India issues its last postage stamps. [1841.931]
- Tannu Tuva issues its last postage stamps. [285.414]
- France issues first postage stamps for use in French West Africa, using overprints of Senegal. [1843.1356]
- December 20
- Italian Socialist Republic issues its first postage stamps, using Italian stamps overprinted "GNR". [1135]
1944
- February 12
- First and only postage stamps are issued for use in Graham Land, a dependency of the Falkland Islands. [1135] [1843.1089]
- February
- First and only postage stamps are issued for use in South Shetlands, a dependency of the Falkland Islands. [1135] [1843.1089]
- February 21
- First and only postage stamps are issued for use in South Orkneys, a dependency of the Falkland Islands. [1135] [1843.1089]
- April 3
- First and only postage stamps are issued for use in South Georgia, a dependency of the Falkland Islands. [1135] [1843.1090]
- (month unknown)
- Last Transjordan (under British mandate) postage stamps issued. [1367.121]
- Idar State of India issues its last postage stamps. [1841.936]
- September 7
- The Polish Peoples Republic issues its first postage stamps. [278.315]
- November 20
- Muscat issues its first postage stamps, using overprinted stamps of India. [1135] [1367.1561]
- December
- The Federal Republic of Yugoslavia issues its first postage stamps, overprints of Serbia. [285.1097]
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