San'yō-Onoda
山陽小野田市
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San'yō-Onoda city hall
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Location of San'yō-Onoda in Yamaguchi Prefecture
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  San'yō-Onoda Location in Japan | |
| Coordinates: 34°00′11″N 131°10′55″E / 34.00306°N 131.18194°E / 34.00306; 131.18194 | |
| Country | Japan |
| Region | Chūgoku (San'yō) |
| Prefecture | Yamaguchi |
| Government | |
| • Mayor | Hirofumi Shirai |
| Area | |
| • Total | 133.09 km2 (51.39 sq mi) |
| Population
(May 31, 2023)
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| • Total | 59,867 |
| • Density | 450/km2 (1,200/sq mi) |
| Time zone | UTC+09:00 (JST) |
| City hall address | 1-1-1 Hinode, Sanyo-Onoda-shi, Yamaguchi-ken 756-8601 |
| Website | Official website |
| Symbols | |
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| Flower | Azalea |
| Tree | Round Leaf Holly |
San'yō-Onoda (山陽小野田市, San'yō-Onoda-shi) is a city located in Yamaguchi Prefecture, Japan.[1] As of 31 May 2023[update], the city had an estimated population of 59,867 in 29122 households and a population density of 530 persons per km2.[2] The total area of the city is 133.09 square kilometres (51.39 sq mi).
San'yō-Onoda is located in the southwestern part of Yamaguchi Prefecture. It is long in the north-south direction and has a fan shape that opens to the Seto Inland Sea. The Asa River flows from the north to the central area, and the Ariho River flows from the northeast to the east, flowing south into the Seto Inland Sea. The city hall is located on the west bank of the Ariho River mouth.
Yamaguchi Prefecture
San'yō-Onoda has a humid subtropical climate (Köppen climate classification Cfa) with very warm summers and cool winters. The average annual temperature in Hikari is 16.3 °C. The average annual rainfall is 1732 mm with September as the wettest month. The temperatures are highest on average in July, at around 27.1 °C, and lowest in January, at around 6.4 °C.[3]
Per Japanese census data, the population of San'yō-Onoda peaked in the 1960s, and has remained relatively steady since the 1970s
| Year | Pop. | ±% |
|---|---|---|
| 1940 | 66,014 | — |
| 1950 | 79,240 | +20.0% |
| 1960 | 82,498 | +4.1% |
| 1970 | 64,536 | −21.8% |
| 1980 | 68,312 | +5.9% |
| 1990 | 69,481 | +1.7% |
| 2000 | 67,429 | −3.0% |
| 2010 | 64,566 | −4.2% |
| Hikari population statistics[4] | ||
The area of San'yō-Onoda was part of an ancient Nagato Province. During the Edo Period, the area was part of the holdings of Chōshū Domain. Following the Meiji restoration, the villages of Asai, Sue, and Takachiho were established within Asa District, Yamaguchi with the creation of the modern municipalities system on April 1, 1889. Asai became the town of Asa on October 1, 1918 and Sue was elevated to town status on April 3, 1920 and renamed Onoda. Takachiho was elevated to town status on April 1, 1938 and merged with Onoda on November 3, 1940 to become the city of Onoda. Asa merged with the town of Habu to form the town of San'yō on September 30, 1956. Onoda and San'yo merged to form the city of San'yō-Onoda on March 22, 2005.
San'yō-Onoda has a mayor-council form of government with a directly elected mayor and a unicameral city council of 22 members. San'yō-Onoda contributes three members to the Yamaguchi Prefectural Assembly. In terms of national politics, the city is part of the Yamaguchi 3rd district of the lower house of the Diet of Japan.
San'yō-Onoda is an industrial city centered on the chemical industry based on cement and oil refining. Along with neighboring Ube, it is part of the Setouchi industrial area.
San'yō-Onoda has 13 public elementary school and six public junior high schools operated by the city government, and three public high schools operated by the Yamaguchi Prefectural Board of Education. There are also one private high school. The city operated San'yō-Onoda City University (formerly the Tokyo University of Science, Yamaguchi) is located in San'yō-Onoda
JR West (JR West) - San'yō Shinkansen
JR West (JR West) - San'yō Main Line
JR West (JR West) - Onoda Line (Main line)
JR West (JR West) - Onoda Line (Motoyama branch line)
Chichibu, Saitama, Japan since May 20, 1996
Moreton Bay, Australia since August 18, 1992
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