Kōka (甲賀市, Kōka-shi) is a city in southern Shiga Prefecture, Japan. (The word 'Kōka' is often rendered as 'Koga' in English, especially when referring to the "Koga Ninja".) As of 30 September 2021^[update], the city had an estimated population of 89,619 in 36708 households and a population density of 190 persons per km².^[1] The total area of the city is 481.62 square kilometres (185.95 sq mi).

Quick Facts 甲賀市, Country ...

Kōka 甲賀市
City
Kōka City Hall
Flag Emblem
Location of Kōka in Shiga Prefecture
Kōka Location in Japan
Coordinates: 34°58′N 136°10′E
Country	Japan
Region	Kansai
Prefecture	Shiga
Government
• Mayor	Hiroki Iwanaga
Area
• Total	481.62 km2 (185.95 sq mi)
Population  (September 30, 2021)
• Total	89,619
• Density	190/km2 (480/sq mi)
Time zone	UTC+09:00 (JST)
City hall address	6053, Minakuchi, Minakuchichō, Kōka-shi, Shiga-ken 528-8502
Website	Official website
Symbols
Bird	Common kingfisher
Flower	Sasayuri (Lilium japonicum)
Tree	Cryptomeria

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Kōka occupies the entire southern end of Shiga Prefecture, and is thus long east-to-west. At the eastern end of Kōka, the southern ridge of the Suzuka Mountains with one elevation of 1000 meters runs from northeast to southwest, forming the boundary with Mie Prefecture. The highest altitude point in Kōka is Mount Amagoi in this range.

Per Japanese census data,^[3] the population of Kōka has recently plateaued after several decades of growth.

Kōka is part of ancient Ōmi Province. During the Sengoku period, the area was an ikki and effectively self-governed by local ninja families. In the Edo period it became a center for the Kōga-ryū school of ninjutsu, in rivalry with Iga-ryū.^[4] The area was on the route of the Tōkaidō highway connecting Kyoto with Edo and the eastern provinces of Japan. Minakuchi-juku was both a post station and also a castle town for Minakuchi Domain, which ruled over parts of the area of Kōka during the Edo period. The village of Minakuchi was established on April 1, 1889 within Kōka District, Shiga with the creation of the modern municipalities system. It was raised to town status on August 18, 1894. On October 1, 2004, Minakuchi merged with the towns of Kōka, Kōnan, Shigaraki and Tsuchiyama (all from Kōka District) to form the city of Kōka.

Kōka has a mayor-council form of government with a directly elected mayor and a unicameral city council of 24 members. Kōka contributes three members to the Shiga Prefectural Assembly. In terms of national politics, the city is part of Shiga 4th district of the lower house of the Diet of Japan.

Kōka is traditionally known for its production of ceramics, most notably Shigaraki ware, as well as agriculture and forestry. Light manufacturing is concentrated to pharmaceuticals.

Kōka has 21 public elementary schools and six public middle schools operated by the city government and one middle school operated by the Shiga Prefectural Department of Education. The prefecture also operates four public high schools.

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• Miho Museum
• Minakuchi Castle
• Minakuchi-juku
• Tsuchiyama-juku
• site of Shigaraki Palace, National Historic Site
• Tarumi Saiō Tongū Site, National Historic Site
• Minakuchi Okayama Castle ruins

• Mineichi Iwanaga, politician
• Kaoruko Himeno, author