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Aikō District (愛甲郡,Aikō-gun) is adistrict located in centralKanagawa Prefecture,Japan. It currently consists of only one town,Aikawa, and one village,Kiyokawa. Thecity of Atsugi was formerly part ofAikō District.

• Aikawa
• Kiyokawa

Aikō District was one of the ancient subdivisions ofSagami Province, extending from central Sagami north to the border ofMusashi Province between theSagami River and theTanzawa Mountains. The district offices were located in what is now part of Atsugi. The area was part of a vastshōen controlled by theŌe clan, and their descendants, theMōri clan ofChōshū from theHeian period through theSengoku period. It later became a contested area between thelater Hōjō clan ofOdawara and theTakeda clan ofKai. In theEdo period, it was nominally part ofOdawara Domain, although large portions weretenryō territory controlled by theshōgun inEdo through varioushatamoto. From 1706, a branch of theŌkubo clan in Odawara was permitted to establish the Ogino-Yamanaka Domain on a portion of the district. Other portions of the district came under control ofKarasuyama Domain ofShimōsa Province.

With theMeiji Restoration of 1868, Ogino-Yamanaka Domain came under the control ofShizuoka Domain, while remaining territories became part of the new Kanagawa Prefecture. With the abolition of the han system in 1871, former Ogino-Yamanaka Domain became Ogino-Yamanaka Prefecture, and subsequently part of the short-lived Ashigaru Prefecture. It merged with Kanagawa Prefecture in 1876.

• The new Aikō andTsukui Districts were established in 1878.
• In 1889, Aikō District was administratively divided into the following municipalities:
  • one town (Atsugi)
  • 16 villages (Koayu, Tamagawa, Nanmori, Mita, Tanasawa, Shimokawairi, Tsumada, Oikawa, Hayashi, Echi, Ogino, Aikawa, Takamine, Nakatsu, Susugaya and Miyagase)
• In 1940, Aikawa Village was elevated to town status.
• In 1946, Mutsuai Village was created through the merger of six villages (Mita, Tanasawa, Shimokawairi, Tsumada, Oikawa and Hayashi).
• In 1955:
  • January 15 – The village of Takamine was absorbed into Aikawa.
  • February 1 – The village of Mutsuai merged with the town of Atsugi and three other villages (Koayu, Tamagawa and Nanmori) to form the city of Atsugi.
  • July 8 – The village of Echi was absorbed into Atsugi.
• In 1956:
  • September 30 – Kiyokawa Village was created through the merger of two villages (Susugaya and Miyagase).
  • September 30 – The village of Nakatsu was absorbed into Aikawa.
  • September 30 – The village of Ogino was absorbed into Atsugi.

35°29′59″N139°15′12″E / 35.49972°N 139.25333°E /35.49972; 139.25333

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