Ishioka, Ibaraki

Ishioka (石岡市, Ishioka-shi) is a city located in Ibaraki Prefecture, Japan. As of 1 July 2020, the city had an estimated population of 72,351 in 28,291 households and a population density of 336 persons per km². The percentage of the population aged over 65 was 33.5%.[1] The total area of the city is 215.53 square kilometres (83.22 sq mi).


Upper: Lake Kasumigaura, Mt Tsukuba Middle: Ishioka festival, Mt Kabasan, lower: Ishioka street scene
Upper: Lake Kasumigaura, Mt Tsukuba
Middle: Ishioka festival, Mt Kabasan, lower: Ishioka street scene
Flag of Ishioka
Official seal of Ishioka
Location of Ishioka in Ibaraki Prefecture
Location of Ishioka in Ibaraki Prefecture
Ishioka is located in Japan
Coordinates: 36°11′27″N 140°17′14″E / 36.19083°N 140.28722°E / 36.19083; 140.28722Coordinates: 36°11′27″N 140°17′14″E / 36.19083°N 140.28722°E / 36.19083; 140.28722
 • Total215.53 km2 (83.22 sq mi)
 (October 2020)
 • Total72,351
 • Density340/km2 (870/sq mi)
Time zoneUTC+9 (Japan Standard Time)
- TreeCastanopsis
- FlowerLilium
- BirdEurasian skylark
Phone number0299-23-1111
Address1-1-1 Ishioka, Ishioka-shi, Ibakaki-ken 315-8640
WebsiteOfficial website
Ishioka City Hall


Ishioka is located in central Ibaraki Prefecture, approximately 70 kilometers north of central Tokyo. It is bordered by Lake Kasumigaura to the south and by mountains on all other sides. The urban area of the city is in the east.

Surrounding municipalitiesEdit

Ibaraki Prefecture


Ishioka has a Humid continental climate (Köppen Cfa) characterized by warm summers and cool winters with light snowfall. The average annual temperature in Ishioka is 13.8 °C. The average annual rainfall is 1331 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.8 °C, and lowest in January, at around 2.8 °C.[2]


Per Japanese census data,[3] the population of Ishioka has remained relatively stable over the past 40 years.

Historical population
1920 46,587—    
1930 51,907+11.4%
1940 54,093+4.2%
1950 68,962+27.5%
1960 65,428−5.1%
1970 66,941+2.3%
1980 76,137+13.7%
1990 80,035+5.1%
2000 83,119+3.9%
2010 79,713−4.1%


During the Nara period, the provincial capital of Hitachi Province was located in what is now part of the city of Ishioka. The area was known as Hitachi-Fuchū (常陸府中), or simply as “Fuchū” for most of history and developed as a castle town during the Edo period for Hitachi-Fuchū Domain. The domain was renamed “Ishioka Domain” in 1869. With the establishment of the modern municipalities system on April 1, 1889 after the Meiji restoration, the town of Ishioka was created. Much of the town was destroyed in a fire of March 14, 1929.

Ishioka was raised to city status on February 11, 1954. The new city annexed the neighboring villages of Mi and Sekigawa on December 1, 1954. On October 1, 2005, the town of Yasato (from Niihari District) was merged into Ishioka.


Ishioka has a mayor-council form of government with a directly elected mayor and a unicameral city council of 22 members. Ishioka contributes two members to the Ibaraki Prefectural Assembly. In terms of national politics, the city is part of Ibaraki 1st district of the lower house of the Diet of Japan.


Ishioka has a diverse economy. Agriculture includes lotus roots, which are cultivated around Lake Kasumigaura, tobacco, and horticulture such as persimmons, mandarin oranges, and strawberries cultivated at the foot of Mount Tsukuba. In addition, the countryside is one of the leading rice areas in Ibaraki prefecture. Pig farming and chicken farming and dairy farming are also major agricultural contributors. The city has an industrial park, with factories owned by Panasonic and Toyo Seikan, among others. Sake brewing is a traditional local industry, as is the manufacturing of incense sticks.


Ishioka has 19 public elementary schools and eight public middle schools operated by the city government, and three public high schools operated by the Ibaraki Prefectural Board of Education. There is also one private middle school and one private high school.



  JR EastJōban Line


Local attractionsEdit

National Historic MonumentsEdit

Notable people from IshiokaEdit


  1. ^ "Ibaraki prefectural official statistics" (in Japanese). Japan.
  2. ^ Ishioka climate data
  3. ^ Ishioka population statistics

External linksEdit

  Media related to Ishioka, Ibaraki at Wikimedia Commons