Kasaoka

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title: "Kasaoka" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["cities-in-okayama-prefecture", "kasaoka,-okayama", "populated-coastal-places-in-japan"] topic_path: "geography" source: "https://en.wikipedia.org/wiki/Kasaoka" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::data[format=table title="Infobox settlement"]

FieldValue
nameKasaoka
native_name笠岡市
native_name_langja
settlement_typeCity
image_skyline笠岡古城山公園より撮影した笠岡市街地(笠岡駅方向) 2014-01-14 13-25.JPG
image_captionView of Kasaoka City
image_flagFlag of Kasaoka, Okayama.svg
image_sealEmblem of Kasaoka, Okayama.svg
seal_typeEmblem
mapframeyes
mapframe-zoom9
mapframe-pointnone
map_captionLocation of Kasaoka in Okayama Prefecture
pushpin_mapJapan
pushpin_map_captionLocation in Japan
coordinates
coordinates_footnotestags --
subdivision_typeCountry
subdivision_nameJapan
subdivision_type1Region
subdivision_name1Chūgoku (San'yō)
subdivision_type2Prefecture
subdivision_name2Okayama
subdivision_type3District
established_title
extinct_titleNow part of
seat_type
government_footnotestags --
leader_titleMayor
leader_nameNorimoto Mishima (current)
leader_title1Vice Mayor
total_type
unit_prefMetric
area_magnitude
area_footnotestags --
area_total_km2136.24
elevation_footnotestags --
population_footnotestags --
population_total45,404
population_as_ofMarch 1, 2023
population_density_km2auto
timezone1JST
utc_offset1+09:00
area_code_type
blank_name_sec1City hall address
blank_info_sec11-1 Chūō, Kasaoka-shi, Okayama-ken 714-8601
blank_name_sec2Climate
blank_info_sec2Cfa
module{{Infobox place symbols
treeGinkgo biloba
flowerChrysanthemum
::

| name = Kasaoka | official_name = | native_name = 笠岡市 | native_name_lang = ja | settlement_type = City | other_name = | image_skyline = 笠岡古城山公園より撮影した笠岡市街地(笠岡駅方向) 2014-01-14 13-25.JPG | imagesize = | image_caption = View of Kasaoka City | image_flag = Flag of Kasaoka, Okayama.svg | image_seal = Emblem of Kasaoka, Okayama.svg | seal_type = Emblem | mapframe = yes | mapframe-zoom = 9 | mapframe-point = none | map_alt = | map_caption = Location of Kasaoka in Okayama Prefecture | pushpin_map = Japan | pushpin_relief = | pushpin_map_caption = Location in Japan | coordinates = | coordinates_footnotes = tags -- | subdivision_type = Country | subdivision_name = Japan | subdivision_type1 = Region | subdivision_name1 = Chūgoku (San'yō) | subdivision_type2 = Prefecture | subdivision_name2 = Okayama | subdivision_type3 = District | subdivision_name3 = | established_title = | established_date = | extinct_title = Now part of | extinct_date = | founder = | named_for = | seat_type = | seat = | government_footnotes = tags -- | leader_party = | leader_title = Mayor | leader_name = Norimoto Mishima (current) | leader_title1 = Vice Mayor | leader_name1 = | total_type = | unit_pref = Metric | area_magnitude = | area_footnotes = tags -- | area_total_km2 = 136.24 | area_land_km2 = | area_water_km2 = | area_water_percent = | area_note = | elevation_footnotes = tags -- | elevation_m = | population_footnotes = tags -- | population_total = 45,404 | population_as_of = March 1, 2023 | population_density_km2 = auto | population_est = | pop_est_as_of = | timezone1 = JST | utc_offset1 = +09:00 | postal_code_type = | postal_code = | area_code_type = | area_code = | blank_name_sec1 = City hall address | blank_info_sec1 = 1-1 Chūō, Kasaoka-shi, Okayama-ken 714-8601 | blank_name_sec2 = Climate | blank_info_sec2 = Cfa | website = | footnotes = | module = {{Infobox place symbols| embedded=yes | tree = Ginkgo biloba | flower = Chrysanthemum | bird = | flowering_tree = | butterfly = | fish = | other_symbols = ::figure[src="https://upload.wikimedia.org/wikipedia/commons/f/fe/Kasaoka_city_hall.JPG" caption="Kasaoka City Hall"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/6/6f/Tsukanomaruyama01.JPG" caption="Kasaoka Islands"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/d/d3/Kasaoka_city_center_area_Aerial_photograph.2007.jpg" caption="Aerial view of Kasaoka city center"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/9/98/Kasaoka_City_Horseshoe_Crab_Museum_-_Apr_12,_2007.jpg" caption="Kasaoka City Horseshoe Crab Museum"] ::

Kasaoka is a city located in Okayama Prefecture, Japan. , the city had an estimated population of 45,404 in 21,987 households and a population density of 330 PD/km2. The total area of the city is 136.24 sqkm. The municipal district also includes 31 outlying islands including seven inhabited islands in the Kasaoka Islands archipelago in the Seto Inland Sea.

Geography

Kasaoka is in the far southwestern corner of Okayama Prefecture, bordered by the Seto Inland Sea to the south and Hiroshima Prefecture to the west. It is mostly hilly and mountainous in the north, and consists of flat reclaimed land in the south. Urbanization is very diffuse, with the main urban concentration at the former port town of Kasaoka, with numerous hamlets scattered widely in narrow valley-shaped plains mostly in the central and northern areas. The tidal flats in the south are noted for endangered horseshoe crabs and the sea area between Kōnoshima and Nishi-Oshima has been designated as a national Natural Monument.

Adjoining municipalities

Hiroshima Prefecture

Climate

Kasaoka has a humid subtropical climate (Köppen climate classification Cfa). The average annual temperature in Kasaoka is 15.7 C. The average annual rainfall is 1055.1 mm with July as the wettest month. The temperatures are highest on average in August, at around 28.0 C, and lowest in January, at around 4.5 C. The highest temperature ever recorded in Kasaoka was 38.0 C on 5 August 2021; the coldest temperature ever recorded was -7.3 C on 27 February 1981.

|width = auto |collapsed = Y |single line = Y |metric first = Y |location = Kasaoka (1991−2020 normals, extremes 1979−present) |Jan record high C = 16.5 |Feb record high C = 21.7 |Mar record high C = 25.0 |Apr record high C = 28.5 |May record high C = 32.2 |Jun record high C = 34.7 |Jul record high C = 38.0 |Aug record high C = 38.0 |Sep record high C = 37.6 |Oct record high C = 31.9 |Nov record high C = 26.7 |Dec record high C = 20.0 |Jan record low C = -6.7 |Feb record low C = -7.3 |Mar record low C = -4.2 |Apr record low C = -1.7 |May record low C = 3.6 |Jun record low C = 10.4 |Jul record low C = 15.8 |Aug record low C = 16.7 |Sep record low C = 9.1 |Oct record low C = 2.5 |Nov record low C = -1.3 |Dec record low C = -4.3 |Jan high C = 9.4 |Feb high C = 10.2 |Mar high C = 13.5 |Apr high C = 19.0 |May high C = 23.9 |Jun high C = 27.1 |Jul high C = 31.1 |Aug high C = 32.8 |Sep high C = 28.7 |Oct high C = 23.1 |Nov high C = 17.2 |Dec high C = 11.8 |Jan mean C = 4.5 |Feb mean C = 5.1 |Mar mean C = 8.3 |Apr mean C = 13.6 |May mean C = 18.6 |Jun mean C = 22.6 |Jul mean C = 26.7 |Aug mean C = 28.0 |Sep mean C = 24.1 |Oct mean C = 18.0 |Nov mean C = 12.0 |Dec mean C = 6.7 |Jan low C = 0.0 |Feb low C = 0.3 |Mar low C = 3.1 |Apr low C = 8.2 |May low C = 13.5 |Jun low C = 18.7 |Jul low C = 23.2 |Aug low C = 24.2 |Sep low C = 20.1 |Oct low C = 13.5 |Nov low C = 7.3 |Dec low C = 2.2 |precipitation colour = green |Jan precipitation mm = 33.0 |Feb precipitation mm = 41.6 |Mar precipitation mm = 76.6 |Apr precipitation mm = 81.2 |May precipitation mm = 102.7 |Jun precipitation mm = 160.7 |Jul precipitation mm = 172.9 |Aug precipitation mm = 80.0 |Sep precipitation mm = 129.2 |Oct precipitation mm = 87.5 |Nov precipitation mm = 50.2 |Dec precipitation mm = 39.6 |year precipitation mm = 1055.1 |unit precipitation days = 1.0 mm |Jan precipitation days = 4.7 |Feb precipitation days = 6.5 |Mar precipitation days = 8.7 |Apr precipitation days = 8.5 |May precipitation days = 8.7 |Jun precipitation days = 10.5 |Jul precipitation days = 9.4 |Aug precipitation days = 6.9 |Sep precipitation days = 8.3 |Oct precipitation days = 6.9 |Nov precipitation days = 5.8 |Dec precipitation days = 5.6 |Jan sun = 150.1 |Feb sun = 146.3 |Mar sun = 181.8 |Apr sun = 196.9 |May sun = 212.0 |Jun sun = 162.3 |Jul sun = 194.1 |Aug sun = 224.5 |Sep sun = 167.8 |Oct sun = 172.1 |Nov sun = 152.5 |Dec sun = 150.1 |year sun = 2110.5 |source 1 = Japan Meteorological Agency{{cite web | url = https://www.data.jma.go.jp/obd/stats/etrn/view/rank_a.php?prec_no=66&block_no=0919&year=&month=&day=&view=h0 |script-title=ja:観測史上1～10位の値（年間を通じての値） | publisher = JMA | access-date = May 2, 2022}}{{cite web | url = https://www.data.jma.go.jp/obd/stats/etrn/view/nml_amd_ym.php?prec_no=66&block_no=0919&year=&month=&day=&view=h0 |script-title=ja:気象庁 / 平年値（年・月ごとの値） | publisher = JMA | access-date = May 2, 2022}}}}

Demographics

Per Japanese census data, the population of Kasaoka in 2020 is 46,088 people. Kasaoka has been conducting censuses since 1950. | 1950 | 75372 | 1955 | 73552 | 1960 | 68987 | 1965 | 63778 | 1970 | 62405 | 1975 | 63413 | 1980 | 61917 | 1985 | 60598 | 1990 | 59619 | 1995 | 60478 | 2000 | 59300 | 2005 | 57272 | 2010 | 54256 | 2015 | 50568 | 2020 | 46088 |align = none |footnote = Kasaoka population statistics

History

The Kasaoka area is part of ancient Bitchū Province and numerous shell middens from the Jōmon period confirm that the area has been inhabited since prehistoric times. The place name 'Kasaoka' is said to have been derived from the area of influence of the 'Kasaomi clan' of the ancient Kingdom of Kibi. Kasaoka Castle, was built by Murakami Takashige at the end of the Muromachi period and was controlled by the Mōri clan during the Sengoku period. Under the Edo Period Tokugawa shogunate, the area became part of the territory of the Mizuno clan of Fukuyama Domain. The Mizuno invested vast sums of money in civil engineering projects to promote the development of new rice fields in Kasaoka, which originally had little flat land. However, the domain fell to attainder in the middle of the Edo period, and the Kasaoka area was ruled as tenryō territory about 170 years until the end of the Edo period.

Following the Meiji restoration, the village of Kasaoka was established within Oda District, Okayama with the creation of the modern municipalities system on June 1, 1889. It was raised to town status on October 23, 1891 and to city status on April 1, 1952. Due to its strong historical, cultural and economic ties with Fukuyama, proposals have been made for a merger between the two municipalities.

Government

Kasaoka has a mayor-council form of government with a directly elected mayor and a unicameral city council of 17 members. Kasaoka contributes two members to the Okayama Prefectural Assembly. In terms of national politics, the city is part of the Okayama 3rd district of the lower house of the Diet of Japan.

Economy

Kasaoka is located in the Seto Inland Sea Industrial Belt and together with neighboring Fukuyama was designated in 1964 as the "Bingo District Special Industrial Development Area". The city has a high concentration of heavy industry, notably related to JFE Steel, a major producer of crude steel in Japan. Agriculture, food processing are also major contributors to the local economy, although the traditional industries stone quarrying and production of pyrethrum are in decline due to competition from foreign sources. The city is also increasing a commuter town for neighboring Fukuyama and Kurashiki.

Education

Kasaoka has 18 public elementary schools and nine public junior high schools operated by the city government and one private junior high school. The city has four public high schools operated by the Okayama prefectural Board of Education. The prefecture also operates one special education school for the disabled.

Transportation

Railway

::figure[src="https://upload.wikimedia.org/wikipedia/commons/b/bd/JR_logo_(west).svg" caption="JR West]] (JR West) - [[San'yō Main Line"] ::

Highways

Sister cities

Kasaoka is twinned with:

Landmarks and local cultural facilities

  • Kasaoka is the location of a protected horseshoe crab breeding habitat and the city features a Horseshoe Crab Museum.
  • Chikkyo Art Museum
  • Tsukumo Shell Mound, National Historic Site
  • In culinary terms, Kasaoka city is known for its abundance of sea food and a local specialty of chicken based ramen.

Crime and safety

The Asano-gumi yakuza syndicate is based in Kasaoka. The Asano-gumi is the only designated yakuza group based in Okayama Prefecture.

References

References

  1. "Kasaoka city official statistics".
  2. [https://www.citypopulation.de/en/japan/okayama/ Kasaoka population statistics]
  3. (2022-11-28). "公職選挙法の一部を改正する法律". [[House of Representatives (Japan).
  4. "友好握手都市＜コタバル市（マレーシア）／モービィロンガコミューン（スウェーデン）＞". Kasaoka City Official Website.
  5. "Kasaoka Municipal Horseshoe Crab Museum".
  6. [http://www.npa.go.jp/hakusyo/h22/honbun/pdf/22p02000.pdf "2010 Police White Paper Chapter 2 : Furtherance of Organized Crime Countermeasures"], 2010, ''[[National Police Agency (Japan). National Police Agency]]'' {{in lang. ja

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cities-in-okayama-prefecturekasaoka,-okayamapopulated-coastal-places-in-japan