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Ōamishirasato City Hall
Ōamishirasato City Hall
Flag of Ōamishirasato
Official seal of Ōamishirasato
Location of Ōamishirasato in Chiba Prefecture
Location of Ōamishirasato in Chiba Prefecture
Ōamishirasato is located in Japan
Coordinates: 35°31′N 140°19′E / 35.517°N 140.317°E / 35.517; 140.317Coordinates: 35°31′N 140°19′E / 35.517°N 140.317°E / 35.517; 140.317
 • Total58.06 km2 (22.42 sq mi)
 (November 2020)
 • Total49,019
 • Density840/km2 (2,200/sq mi)
Time zoneUTC+9 (Japan Standard Time)
- TreeOsmanthus
- FlowerCosmos (plant)
Phone number0475-70-0300
Address115-2 Ōami, Ōamishirasato-shi, Chiba-ken 299-3292
WebsiteOfficial website
Area around Ōami Station

Ōamishirasato (大網白里市, Ōamishirasato-shi) is a city located in Chiba Prefecture, Japan. As of 1 November 2020, the city had an estimated population of 49,019 in 21,860 households and a population density of 840 persons per km².[1] The total area of the city is 58.06 square kilometres (22.42 sq mi).


Ōamishirasato is located in central Chiba prefecture, approximately 50 to 60 kilometers from the center of Tokyo. The city area is long and narrow from east to west. In the west is the hilly "Oami district", in the center is the agricultural "Masuho district" and in the east, facing the Pacific Ocean is the "Shirasato district". The city is in the southwestern part of Kujukuri Plain and is part of the Kujūkuri beach region.

Surrounding Municipalities[edit]

Chiba Prefecture


Ōamishirasato has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Ōamishirasato is 15.2 °C. The average annual rainfall is 1581 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.2 °C, and lowest in January, at around 5.3 °C.[2]


Per Japanese census data,[3] the population of Ōamishirasato has been steadily increasing.

Historical population
1970 22,789—    
1980 25,478+11.8%
1990 32,742+28.5%
2000 48,051+46.8%
2010 50,720+5.6%


Ōami Town and Shirasato Village were created during the organization of Sanbu District within Chiba Prefecture with the establishment of the modern municipalities system on April 1, 1889. Shirasato was elevated to town status on August 10, 1935. Ōami Town expanded through the annexation of neighboring villages of Yamane and Mizuho on April 1, 1951. Ōami and Shirasato Towns and Masuho Village were merged to create Ōamishirasato Town on December 1, 1954. The town annexed a portion of Honnō Town in a boundary adjustment of November 1, 1957. Ōamishirasato was elevated to city status on January 1, 2013.[4][5][6]


Ōamishirasato has a mayor-council form of government with a directly elected mayor and a unicameral city council of 18 members. Ōamishirasato contributes one member to the Chiba Prefectural Assembly. In terms of national politics, the city is part of Chiba 11th district of the lower house of the Diet of Japan.


Ōamishirasato is a regional commercial center, and a bedroom community for the nearby metropolis of Chiba. Per the fiscal 2010 census, the commuting rate is 18.8% for Chiba and 11.7% for Tokyo.


Ōamishirasato has seven public elementary schools and three public middle schools operated by the city government, and one public high school operated by the Chiba Prefectural Board of Education.



JR logo (east).svg JR EastSotobō Line

JR logo (east).svg JR EastTōgane Line


Sister city relations[edit]

Noted people from Ōamishirasato[edit]


  1. ^ "Ōamishirasato city official statistics" (in Japanese). Japan.
  2. ^ Ōamishirasato climate data
  3. ^ Ōamishirasato population statistics
  4. ^ Ishii, Sōseki, ed. (May 2012). 平成25年1月1日 大網白里市誕生に向けて [Toward the formation of the city of Ōamishirasato on Jan. 1, 2013] (PDF). Hōkoku Ōamishirasato (in Japanese). Ōamishirasato-machi, Chiba Prefecture, Japan: Ōamishirasato-machi, Hissho Kōhōka, Kōhō Tōkeihan (541): 2. Retrieved May 10, 2012.
  5. ^ Yoshimura, Kenji (March 2, 2012). "Indiana University Libraries, Bloomington Serials Holdings, 1985" 大網白里町:名称「大網白里市」に来年1月 [Town of Ōamishirasato will be named "City of Ōamishirasato" in January 2013]. Mainichi Shinbun (in Japanese). Tokyo: Mainichi Newspapers. OCLC 10684368. Retrieved May 10, 2012.
  6. ^ 新市へ58年の歴史に幕 大網白里町で閉町式 [After 58 Years, a New City: a Ceremony for the Closing of the Town of Ōamishirasato]. Chiba Nippo (in Japanese). Chiba, Chiba Prefecture, Japan: Chiba Nippo Co., Ltd. 2012-12-29. Retrieved 2012-12-31.

External links[edit]

Media related to Ōamishirasato, Chiba at Wikimedia Commons