was a district

Districts of Japan

The was most recently used as an administrative unit in Japan between 1878 and 1921 and is roughly equivalent to the county of the United States, ranking at the level below prefecture and above city, town or village. As of 2008, cities belong directly to prefectures and are independent from...

 located in Ehime Prefecture. Due to the mergers — The district dissolved on January 1, 2005.

The district had an estimated population

Population

A population is all the organisms that both belong to the same group or species and live in the same geographical area. The area that is used to define a sexual population is such that inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals...

 of 40,690 and the total area was 248.73 km² (combined calculations of the former towns of Shigenobu, Kawachi, and Nakajima).

History

This district was located in what is currently the center of Matsuyama

Matsuyama, Ehime

is the capital city of Ehime Prefecture on the Shikoku island of Japan. It is located on the northeastern portion of the Dōgo Plain. Its name means "pine mountain." The city was founded on December 15, 1889....

. It was once known as the , where yu means "hot water."

The district was named after the Dōgo Onsen

Dogo Onsen

is a hot spring in the city of Matsuyama, Ehime Prefecture on the island of Shikoku, Japan.-History:Dōgo Onsen is one of the oldest onsen hot springs in Japan, with a history stretching back over 1,000 years. The springs are mentioned in the Man'yōshū is a hot spring in the city of Matsuyama,...

.

• Due to the 1878 Land Reforms, Kasahaya, Wake
  Wake District, Iyo
  was a district located in central Iyo Province. Due to the 1878 Land Reforms, the district merged with Onsen District and the district dissolved.-See also:*List of dissolved districts of Japan*Wake District...
  
  , and Kume
  Kume District, Iyo
  was a district located in central Iyo Province until 1878. In the seventh century, under the system, Kume District was established. In 701, under the system, Kume District is supposed to have been established...
  
   Districts merged with the Onsen District.
• December 15, 1889 — Due to the city status enforcement, The city of Matsuyama was formed.
• Around 1897 — Several villages from the Kamiukena District
  Kamiukena District, Ehime
  The is a district located in Ehime Prefecture, Japan. As of 2004 — The estimated population is 11,222 with a total area of 583.66 km².It consists of one town.*Kumakōgen-History:...
  
   were reassigned to the Onsen District: Ukena, Ebara, Sakamoto, Minamiyoshii, Haishi, and Miuchi.
• During 1897 — The village of Habu from Iyo District
  Iyo District, Ehime
  The is a district located in Ehime Prefecture, Japan. As of 2004 the estimated population is 52,832 with a total area is 121.89 km².The district contains two towns*Masaki*Tobe-History:...
  
   was reassigned to Onsen District.
• During 1897 — The village of Yodo in Iyo District was reassigned to Onsen District. (2 towns, 40 towns)
• November 28, 1898 — The village of Hōjō gained town status. (3 towns, 39 villages)
• October 1, 1914 — Parts of the village of Tateiwa merged into the village of Asanami.
• April 1, 1923 — The village of Dōgo split and merged into the city of Matsuyama and the town of Dōgoyuno. (3 towns, 38 villages)
• May 10, 1925 — The village of Furumitsu merged into the town of Mitsuhama. (3 towns, 37 villages)
• February 11, 1926 — The villages of Soga, Yūgun, Asami, and Miyuki merged into the city of Matsuyama. (3 towns, 33 villages)
• February 1, 1932, parts of the town of Dōgoyuno (former village of Dōgo areas) merged into the city of Matsuyama.
• June 1, 1937 — The village of Shinhama merged into the town of Mitsuhama. (3 towns, 32 villages)
• August 1, 1940 — The villages of Mibu, Kuwabara, Wake, Horie, Shiomi, Hisaeda, and the town of Mitsuhama merged into the city of Matsuyama. (2 towns, 26 villages)
• April 1, 1944 — The villages of Habu, Shōseki, and the town of Dōgoyuno merged into the city of Matsuyama. (1 town, 24 villages)
• April 1, 1951 — The town of Hōjō, and the villages of Nanba and Masaoka merged to form the town of Hōjō. (1 town, 22 villages)
• August 1, 1952 — The village of Higashinakajima gained town status. (2 towns, 21 villages)
• February 1, 1954 — The village of Gogoshima merged into the city of Matsuyama. (2 towns, 20 villages)
• October 1, 1954 — The village of Yodo merged into the city of Matsuyama. (2 towns, 19 villages)
• March 31, 1955 — The town of Hōjō, and the villages of Asanami, Tateiwa, Kōno, and Awai merged to form the town of Hōjō. (2 towns, 15 villages)
• April 25, 1955 — The villages of Kawakami and Miuchi merged to form the village of Kawauchi. (2 towns, 14 villages)
• May 1, 1955 — The villages of Idai, Kume, Gomyō, and Yuyama merged into the city of Matsuyama. (2 towns, 12 villages)
• September 1, 1956 — The village of Kitayoshii, Minamiyoshii, and Haishi merged to form the town of Shigenobu. (3 towns, 9 villages)
• September 1, 1956 — The village of Kawauchi
  Kawauchi, Ehime
  was a town located in Onsen District, Ehime, Japan.On September 21, 2004 Kawauchi was merged with the town of Shigenobu, also from Onsen District, to form the new city of Tōon and no longer exists as an independent municipality....
  
   and parts of the village of Nakagawa in the Shūsō District
  Shuso District, Ehime
  was a district located in Ehime Prefecture, Japan. Due to the mergers, the district dissolved on November 1, 2004.-History:* April, 1897 — Shūfu District and Kuwamura District merged to become the Shūsō District....
  
   merged to form the town of Kawauchi. (4 towns, 8 villages)
• September 30, 1956 — The villages of Ebara and Sakamoto merged to form the village of Kutani. (4 towns, 7 villages)
• November 1, 1958 — The town of Hōjō gained city status, thus leaving the district. (3 towns, 7 villages)
• March 31, 1959 — The village of Jinwa and the town of Nakajima merged to form the town of Nakajima. (3 towns, 6 villages)
• April 10, 1959 — The village of Ukena merged into the city of Matsuyama. (3 towns, 5 villages)
• March 31, 1960 — The village of Mutsuno merged into the town of Nakajima. (3 towns, 4 villages)
• December 15, 1961 — The village of Ono merged into the city of Matsuyama. (3 towns, 3 villages)
• April 1, 1962 — The village of Ishii merged into the city of Matsuyama. (3 towns, 2 villages)
• March 31, 1963 — The village of Nishinakajima merged into the town of Nakajima. (3 towns, 1 village)
• October 25, 1968 — The village of Kutani merged into the city of Matsuyama. (3 towns)
• September 21, 2004 — The towns of Kawauchi
  Kawauchi, Ehime
  was a town located in Onsen District, Ehime, Japan.On September 21, 2004 Kawauchi was merged with the town of Shigenobu, also from Onsen District, to form the new city of Tōon and no longer exists as an independent municipality....
  
   and Shigenobu
  Shigenobu, Ehime
  was a town located in Onsen District, Ehime, Japan.On September 21, 2004 Shigenobu was merged with the town of Kawauchi, also from Onsen District, to form the new city of Tōon and no longer exists as an independent municipality....
  
   merged to form the new city of Tōon
  Toon, Ehime
  is a city located in Ehime, Japan.As of November 1, 2004, the city had an estimated population of 34,597 and a density of 163 persons per km². The total land area is 211.45 km²....
  
  . (1 town)
• January 1, 2005 — The town of Nakajima
  Nakajima, Ehime
  was a town located in Onsen District, Ehime, Japan.On January 1, 2005 Nakajima, along with the old city of Hōjō, was merged into the expanded city of Matsuyama and no longer exists as an independent municipality....
  
   merged into the city of Matsuyama
  Matsuyama, Ehime
  is the capital city of Ehime Prefecture on the Shikoku island of Japan. It is located on the northeastern portion of the Dōgo Plain. Its name means "pine mountain." The city was founded on December 15, 1889....
  
  . Thus the Onsen District was dissolved.