Yachiyo, Chiba

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Yachiyo City Hall
Yachiyo City Hall
Flag of Yachiyo
Official logo of Yachiyo
Location of Yachiyo in Chiba Prefecture
Location of Yachiyo in Chiba Prefecture
Yachiyo is located in Japan
Coordinates: 35°43′20.7″N 140°05′59.6″E / 35.722417°N 140.099889°E / 35.722417; 140.099889Coordinates: 35°43′20.7″N 140°05′59.6″E / 35.722417°N 140.099889°E / 35.722417; 140.099889
 • MayorToshiro Toyoda (since December 2003)
 • Total51.39 km2 (19.84 sq mi)
 (November 30, 2020)
 • Total202,071
 • Density3,900/km2 (10,000/sq mi)
Time zoneUTC+9 (Japan Standard Time)
- FlowerRose
Phone number047-483-1151
Address312-5 Ōwadashinden, Yachiyo-shi, Chiba-ken 276-8501
WebsiteOfficial website
central Yachiyo
Keisei Rose Gardens

Yachiyo (八千代市, Yachiyo-shi) is a city located in Chiba Prefecture, Japan. As of 30 November 2020, the city had an estimated population of 202,071 in 91,092 households and a population density of 3900 persons per km².[1] The total area of the city is 51.39 square kilometres (19.84 sq mi).


Yachiyo is located inland in northwestern Chiba Prefecture on the Shimōsa Plateau,[2] about 13 kilometers from the prefectural capital at Chiba and 33 kilometers from central Tokyo. The Shin River, 10 kilometers (6.2 mi) in length, flows through Yachiyo and forms the upper part of the Inba Discharge Channel.[3] Pollution was once problematic along the river caused by phosphorus, potassium, and nitrogen draining from vegetable farms along the length of the river.[4] A 19 kilometers (12 mi) walking path was built by the city of Yachiyo, and features a pedestrian suspension bridge with an observation platform.[5]

Neighboring municipalities[edit]

Chiba Prefecture


Yachiyo has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Yachiyo is 14.9 °C. The average annual rainfall is 1394 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.5 °C, and lowest in January, at around 4.5 °C.[6]


Per Japanese census data,[7] the population of Yachiyo has grown rapidly over the past 70 years.

Historical population
1950 14,792—    
1960 21,709+46.8%
1970 66,995+208.6%
1980 134,479+100.7%
1990 148,615+10.5%
2000 168,848+13.6%
2010 189,781+12.4%
2020 199,489+5.1%


Early history[edit]

Yachiyo has been inhabited since the Japanese Paleolithic period, and archaeologists have found stone tools dating to over 30,000 years ago. The Chiba clan controlled the area of present-day Yachiyo from the late Heian period to the early Muromachi period.[2] In the Sengoku period, the area came under the control of the Murakami clan.

Edo period[edit]

During the Edo period the area was divided between tenryō territory under the direct control of the Tokugawa shogunate and areas controlled under the Sakura Domain.[2] It developed as a post town on the pilgrimage route to the temples at Narita.

Modern history[edit]

After the Meiji Restoration, the villages of Owada in Chiba District and Aso in Inba District, Chiba Prefecture were founded on April 1, 1889 with the creation if then modern municipalities system. However, much of the area of these villages was already under the control of the Imperial Japanese Army, who had established a training school in 1876 for infantry maneuvers. The school remained an active military installation until 1945. Yachiyo Town was created by the merger of Owada Town with Aso and Mutsu villages in 1954. Yachiyo was elevated to city status on January 1, 1967.


Yachiyo has a mayor-council form of government with a directly elected mayor and a unicameral city council of 28 members. Yachiyo contributes three members to the Chiba Prefectural Assembly. In terms of national politics, the city is part of Chiba 2nd district of the lower house of the Diet of Japan.


Yachiyo is a regional commercial center and a bedroom community for nearby Chiba and Tokyo.[8] The commuting rate to Tokyo is 26.6% (2010 census). There is some residual agriculture, with rice and nashi pears grown. Pearl Musical Instrument Company is located within Yachiyo.



Primary and secondary education[edit]

Isumi has 22 public elementary schools and 13 public middle schools operated by the city government, and six public high schools operated by the Chiba Prefectural Board of Education. The prefecture also operates one special education school for the handicapped.



Keisei Logo.svg Keisei Electric Railway - Keisei Main Line

Toyo Rapid Railway logo.svg Tōyō Rapid Railway Company - Tōyō Rapid Railway Line


Local attractions[edit]

Notable people from Yachiyo[edit]

Sister city relations[edit]


  1. ^ "Yachiyo city official statistics" (in Japanese). Japan.
  2. ^ a b c d "八千代市 (Yachiyo-shi)". Nihon Daihyakka Zensho (Nipponika) (日本大百科全書(ニッポニカ) (in Japanese). Tokyo: Shogakukan. 2012. Retrieved 2012-04-25.
  3. ^ "八千代市 (Yachiyo-shi)". Dijitaru daijisen (in Japanese). Tokyo: Shogakukan. 2012. Retrieved 2012-04-25.
  4. ^ 新川の歴史(in Japanese)
  5. ^ 新川遊歩道(in Japanese)
  6. ^ Yachiyo climate data
  7. ^ Yachiyo population statistics
  8. ^ "Yachiyo". Encyclopedia of Japan. Tokyo: Shogakukan. 2012. Retrieved 2012-04-25.
  9. ^ "International Exchange". List of Affiliation Partners within Prefectures. Council of Local Authorities for International Relations (CLAIR). Retrieved 21 November 2015.

External links[edit]