Ichihara 市原市 | |||||||||
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 Flag  Seal | |||||||||
 Location of Ichihara in Chiba Prefecture | |||||||||
  Ichihara | |||||||||
| Coordinates:35°29′53″N140°06′55.6″E / 35.49806°N 140.115444°E /35.49806; 140.115444 | |||||||||
| Country | Japan | ||||||||
| Region | Kantō | ||||||||
| Prefecture | Chiba | ||||||||
| First official recorded | mid 3rd century (official) | ||||||||
| Goi town settled | May 20, 1891[citation needed] | ||||||||
| Ichihara town settled | March 31, 1955 | ||||||||
| Both town merged and city settled | May 1, 1963 | ||||||||
| Government | |||||||||
| • Mayor | Joji Koide (since June 2015) | ||||||||
| Area | |||||||||
• Total | 368.17 km2 (142.15 sq mi) | ||||||||
| Population (December 1, 2020) | |||||||||
• Total | 274,117 | ||||||||
| • Density | 744.54/km2 (1,928.3/sq mi) | ||||||||
| Time zone | UTC+9 (Japan Standard Time) | ||||||||
| Phone number | 0436-22-1111 | ||||||||
| Address | 1-1-1 Kokubunjidai Chūō, Ichihara-shi, Chiba-ken 290-8501 | ||||||||
| Climate | Cfa | ||||||||
| Website | Official website | ||||||||
| Symbols | |||||||||
| Bird | Japanese bush-warbler | ||||||||
| Flower | Cosmos | ||||||||
| Tree | Ginkgo biloba | ||||||||
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Ichihara (市原市,Ichihara-shi) is acity, located inChiba Prefecture,Japan. As of 1 December 2020[update], the city had an estimatedpopulation of 274,117 in 128,316 households and apopulation density of 240 persons per km2.[1] The total area of the city is 368.20 square kilometres (142.16 sq mi). The city is home, together with the city ofChiba, to theJEF United football club. The whole city is also parts ofGreater Tokyo Area.
Ichihara is located in the western part of theBōsō Peninsula, and geographically is the largest of Chiba Prefecture's cities and towns. The south is a mountainous area connected to the Boso hills. The highly industrialized northern part of the city facesTokyo Bay. Ichihara, dense in housing developments, serves as asatellite town of Tokyo and Chiba City.
Chiba Prefecture
Ichihara has ahumid subtropical climate (KöppenCfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Ichihara is 15.1 °C (59.2 °F). The average annual rainfall is 1,673.1 mm (65.87 in) with October as the wettest month. The temperatures are highest on average in August, at around 26.5 °C (79.7 °F), and lowest in January, at around 4.1 °C (39.4 °F).[2]
| Climate data for Ichihara (1991−2020 normals, extremes 1978−present) | |||||||||||||
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| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 21.1 (70.0) | 24.6 (76.3) | 27.5 (81.5) | 30.0 (86.0) | 35.7 (96.3) | 36.5 (97.7) | 40.2 (104.4) | 39.2 (102.6) | 37.5 (99.5) | 33.8 (92.8) | 26.4 (79.5) | 24.3 (75.7) | 40.2 (104.4) |
| Mean daily maximum °C (°F) | 10.5 (50.9) | 11.3 (52.3) | 14.4 (57.9) | 19.5 (67.1) | 23.7 (74.7) | 26.1 (79.0) | 30.3 (86.5) | 31.8 (89.2) | 27.7 (81.9) | 22.4 (72.3) | 17.6 (63.7) | 12.9 (55.2) | 20.7 (69.2) |
| Daily mean °C (°F) | 4.1 (39.4) | 5.2 (41.4) | 8.6 (47.5) | 13.7 (56.7) | 18.2 (64.8) | 21.3 (70.3) | 25.4 (77.7) | 26.5 (79.7) | 22.9 (73.2) | 17.3 (63.1) | 11.8 (53.2) | 6.6 (43.9) | 15.1 (59.2) |
| Mean daily minimum °C (°F) | −1.5 (29.3) | −0.6 (30.9) | 2.9 (37.2) | 8.0 (46.4) | 13.1 (55.6) | 17.3 (63.1) | 21.5 (70.7) | 22.5 (72.5) | 19.0 (66.2) | 13.0 (55.4) | 6.6 (43.9) | 1.1 (34.0) | 10.2 (50.4) |
| Record low °C (°F) | −8.0 (17.6) | −9.2 (15.4) | −5.7 (21.7) | −2.4 (27.7) | 3.3 (37.9) | 8.0 (46.4) | 11.7 (53.1) | 14.3 (57.7) | 7.7 (45.9) | 1.8 (35.2) | −3.1 (26.4) | −7.0 (19.4) | −9.2 (15.4) |
| Averageprecipitation mm (inches) | 82.4 (3.24) | 74.0 (2.91) | 138.0 (5.43) | 132.5 (5.22) | 130.4 (5.13) | 170.6 (6.72) | 151.8 (5.98) | 114.8 (4.52) | 237.1 (9.33) | 256.8 (10.11) | 113.9 (4.48) | 70.9 (2.79) | 1,673.1 (65.87) |
| Average precipitation days(≥ 1.0 mm) | 6.3 | 6.9 | 11.2 | 10.5 | 10.4 | 11.9 | 10.0 | 7.3 | 11.8 | 12.0 | 9.0 | 6.5 | 113.8 |
| Mean monthlysunshine hours | 182.0 | 158.4 | 160.8 | 172.1 | 170.1 | 117.3 | 159.2 | 192.0 | 135.7 | 126.4 | 142.2 | 162.9 | 1,879.2 |
| Source:Japan Meteorological Agency[3][2] | |||||||||||||
The area of modern Ichihara is the center of ancientKazusa province. The ruins of theNara periodKazusa Kokubun-jiprovincial temple have been found within the borders of Ichihara, although the exact location of the Nara-periodprovincial capital remains uncertain. During theSengoku period, the area was contested between theChiba clan to the north, and theSatomi clan to the south. During theEdo period, the area was divided betweenGoi Domain,Tsurumaki Domain and large areas oftenryō territory controlled directly by theTokugawa shogunate and administered by varioushatamoto.
Ichihara has amayor-council form of government with a directly elected mayor and aunicameral city council of 32 members. Ichihara contributes four members to the Chiba Prefectural Assembly. In terms of national politics, the city is part ofChiba 3rd district of thelower house of theDiet of Japan.
Per Japanese census data,[6] the population of Ichihara has recently plateaued after several decades of strong growth.
| Year | Pop. | ±% |
|---|---|---|
| 1920 | 68,825 | — |
| 1930 | 71,287 | +3.6% |
| 1940 | 75,069 | +5.3% |
| 1950 | 98,375 | +31.0% |
| 1960 | 94,309 | −4.1% |
| 1970 | 155,852 | +65.3% |
| 1980 | 216,394 | +38.8% |
| 1990 | 257,716 | +19.1% |
| 2000 | 278,218 | +8.0% |
| 2010 | 280,416 | +0.8% |
| 2020 | 269,524 | −3.9% |
The city's economy is fueled by a large industrial complex overlooking Tokyo Bay. It contains the largest number ofoil refineries in Japan, as well as power, petrochemical and shipbuilding companies.[7]
Keisei Electric Railway –Keisei Chihara Line
Kominato Railway –Kominato Line
Mobile, Alabama, United States, since November 10, 1993TheSoai-kaiyakuza syndicate is headquartered in Ichihara.[8] Adesignated yakuza group, the Soai-kai is one of the three dominating yakuza syndicates in Chiba Prefecture, along with theSumiyoshi-kai and theInagawa-kai.[9]
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