List of territories acquired by the Empire of Japan

This is a list of regions occupied or annexed by the Empire of Japan until 1945, the year of the end of World War II in Asia, after the surrender of Japan. Control over all territories except most of the Japanese mainland (Hokkaido, Honshu, Kyushu, Shikoku, and some 6,000 small surrounding islands) was renounced by Japan in the unconditional surrender after World War II and the Treaty of San Francisco. A number of territories occupied by the United States after 1945 were returned to Japan, but there are still a number of disputed territories between Japan and Russia (the Kuril Islands dispute), South Korea and North Korea (the Liancourt Rocks dispute), the People's Republic of China and Taiwan (the Senkaku Islands dispute).

Pre-1945

Colonies

Taiwan and the Penghu Islands – 1895–1945
Karafuto – 1905–1943
Kantō – 1905–1945
Chōsen – 1910–1945
Kiautschou Bay Leased Territory – 1914–1922
Nan’yō 1919–1945

Occupied territories

All ports and major towns in the Primorsky Krai and Siberia regions of Russia east of the city of Chita, from 1918 until gradually withdrawing in 1922.^[1]
North Sakhalin was occupied by Japan 1920–1925.

World War II

Territory	Japanese name	Date	Population est. (1943)	Notes
South Sakhalin	Karafuto Prefecture (樺太庁)	1905–1943	406,000	Elevated to naichi status in 1943.
Mainland China	Chūgoku tairiku (中国大陸)	1931–1945	200,000,000 (est)	Manchukuo 50 million (1940), Rehe, Kwantung Leased Territory, Jiangsu, Shanghai, Shandong, Hebei, Beijing, Tianjin, plus parts of : Guangdong, Guangxi, Hubei, Hunan, Fujian, Guizhou, Inner Mongolia
Japan proper	naichi (内地)	1868-1945	76,200,000	Present day Japan, South Sakhalin (after 1943), and Kuril Islands
Korea	Chōsen (朝鮮)	1910-1945	25,500,000
Taiwan	Taiwan (臺灣)	1895-1945	6,586,000
Hong Kong	Hon Kon (香港)	December 12, 1941 – August 15, 1945	1,400,000	Hong Kong (UK)
:: East Asia (subtotal)	Higashi Ajia (東アジア)	–	310,092,000
Vietnam	Annan (安南)	July 15, 1940 – August 29, 1945	22,122,000	As French Indochina (FR)
Cambodia	Kanbojia (カンボジア)	July 15, 1940 – August 29, 1945	3,100,000	As French Indochina, Japanese occupation of Cambodia
Laos	Raosu (ラオス)	July 15, 1940 – August 29, 1945	1,400,000	As French Indochina, Japanese occupation of Laos
Thailand	Tai (タイ)	December 8, 1941 – August 15, 1945	16,216,000	Independent State but Allied with Japan
Malaysia	Maraya (マラヤ), Kita Boruneo (北ボルネオ), Marai (マライ)	March 27, 1942 – September 6, 1945 (Malaya), March 29, 1942 – September 9, 1945 (Sarawak, Brunei, Labuan, North Borneo)	4,938,000 plus 39,000 (Brunei)	As Malaya (UK), British Borneo (UK), Brunei (UK)
Philippines	Firipin (フィリピン)	May 8, 1942 – July 5, 1945	17,419,000	Philippines (US)
Dutch East Indies	Higashi Indo (東印度)	January 18, 1942 – October 21, 1945	72,146,000	Dutch East Indies (NL)
Singapore	Syōnan-tō (昭南島)	February 15, 1942 – September 9, 1945	795,000	Singapore (UK)
Burma (Myanmar)	Biruma (ビルマ)	1942–1945	16,800,000	Burma (UK)
East Timor	Higashi Chimōru (東チモール)	February 19, 1942 – September 2, 1945	450,000	Portuguese Timor (PT)
:: Southeast Asia (subtotal)	Tōnan Ajia (東南アジア)	–	155,452,000
New Guinea	Nyū Ginia (ニューギニア)	December 27, 1941 – September 15, 1945	1,400,000	As Papua and New Guinea (AU)
Guam	Ōmiya-tō (大宮島)	January 6, 1942 – October 24, 1945		from Guam (US)
South Seas Mandate	Nan'yō Guntō (南洋群島)	1919–1945	129,000	from German Empire
Nauru	Nauru (ナウル)	August 26, 1942 – September 13, 1945	3,000	Occupied from the United Kingdom, Australia and New Zealand
Wake Island, US	Ōtori-shima, -jima (大鳥島)	December 27, 1941 – September 4, 1945	nil	US
Kiribati	Kiribasu (キリバス)	December 1941 – January 22, 1944	28,000	from Gilbert Islands (UK)
:: Pacific Islands (subtotal)	–	–	1,433,000
:: Total Population	–	–	465,544,000

Disclaimer: Not all areas were considered part of Imperial Japan but rather part of puppet states & sphere of influence, allies, included separately for demographic purposes. Sources: POPULSTAT Asia^[2] Oceania^[3]

Other occupied islands during World War II:

Andaman Islands (India) – March 29, 1942 – September 9, 1945
Christmas Island (Australia) – March 1942 – October 1945
Attu and Kiska (Alaska, United States) – June 3, 1942 – August 15, 1943

Areas attacked but not conquered

Kohima and Manipur (India)
Dornod (Khalkhin Gol, Mongolia)
Midway Atoll (United States)

Raided without immediate intent of occupation

Air raids
- Pearl Harbor (Hawaii, United States)
- Colombo and Trincomalee (Sri Lanka)
- Calcutta (India)
- Chittagong (Bangladesh)
- Air raids on Australia, including:
  - Broome (Western Australia, Australia)
  - Darwin (Northern Territory, Australia)
  - Townsville (Queensland, Australia)
- Dutch Harbor (Alaska, United States)
- Lookout Air Raids (Oregon, United States)
Naval bombardment by submarine
- British Columbia (Canada)
- Ellwood (Santa Barbara, California, United States)
- Fort Stevens (Oregon, United States)
- Newcastle (New South Wales, Australia)
- Gregory (Western Australia, Australia)
Midget sub attack
- Sydney (New South Wales, Australia)
- Diego Suarez (Madagascar)

References

^ Leonard A. Humphreys (1995). 'The Way of the Heavenly Sword: The Japanese Army in the 1920s. Stanford University Press. p. 26.
^ http://www.populstat.info/Asia/asia.html Archived 2020-02-23 at the Wayback Machine Populstat ASIA
^ http://www.populstat.info/Oceania/oceania.html Archived 2020-02-25 at the Wayback Machine Populstat OCEANIA

[1] Leonard A. Humphreys (1995). 'The Way of the Heavenly Sword: The Japanese Army in the 1920s. Stanford University Press. p. 26.

[populasia-2] ttp://www.populstat.info/Asia/asia.html Archived 2020-02-23 at the Wayback Machine Populstat ASIA

[populocean-3] ttp://www.populstat.info/Oceania/oceania.html Archived 2020-02-25 at the Wayback Machine Populstat OCEANIA

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