Koga, Ibaraki


Koga city hall



Location of Koga in Ibaraki Prefecture


Coordinates: 36°10′41.7″N 139°45′19.6″E / 36.178250°N 139.755444°E / 36.178250; 139.755444Coordinates: 36°10′41.7″N 139°45′19.6″E / 36.178250°N 139.755444°E / 36.178250; 139.755444
Country Japan
Region Kantō
Prefecture Ibaraki Prefecture
  Mayor Kenichiro Sugaya (since December 2012)
  Total 123.58 km2 (47.71 sq mi)
Population (September 2015)
  Total 140,770
  Density 1,140/km2 (3,000/sq mi)
Time zone Japan Standard Time (UTC+9)
- Tree Zelkova serrata
- Flower Prunus persica
Phone number 0280-92-3111
Address 2248 Shimoōno, Koga-shi, Ibaraki-ken 306-0291
Website Official website

Koga (古河市 Koga-shi) is a city located in Ibaraki Prefecture, in the northern Kantō region of Japan. As of September 2015, the city had an estimated population of 140,770 and a population density of 1140 persons per km². Its total area was 123.58 square kilometres (47.71 sq mi).


Koga is located in the extreme southwestern corner of Ibaraki Prefecture

Surrounding municipalities


Koga developed in the Muromachi period as the Koga kubō, a secondary government created by the Ashikaga shogunate to rule eastern Japan. However, the site has been inhabited since the Jomon period and was one of the largest centers for iron production in eastern Japan in the Heian period. In the Sengoku period, it developed into a castle town and became the seat of the daimyo of Koga Domain under the Edo period Tokugawa shogunate. The town of Koga was established on April 1, 1889 with the creation of the municipalities system. The modern city was founded on August 1, 1950. On September 12, 2005, Koga absorbed the towns of Sanwa and Sōwa (both from Sashima District) to create the new and expanded city of Koga. The new city hall is now located at the former town of Sōwa.


Koga was known in the Meiji period through early Showa period as a center for sericulture. At present, the economy is highly industrialized, with the number of factories as second within Ibaraki Prefecture, after Hitachi city.


Koga has 23 elementary schools, nine middle schools, and six high schools.




Sister city relations

Local attractions

Notable people from Koga

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