Nagai, Yamagata

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Nagai City Hall
Nagai City Hall
Flag of Nagai
Official seal of Nagai
Location of Nagai in Yamagata Prefecture
Location of Nagai in Yamagata Prefecture
Nagai is located in Japan
Coordinates: 38°6′27″N 140°2′25.9″E / 38.10750°N 140.040528°E / 38.10750; 140.040528Coordinates: 38°6′27″N 140°2′25.9″E / 38.10750°N 140.040528°E / 38.10750; 140.040528
 • Total214.67 km2 (82.88 sq mi)
 (February 2020)
 • Total26,466
 • Density120/km2 (320/sq mi)
Time zoneUTC+9 (Japan Standard Time)
- TreeAzalea
- FlowerIris
Phone number0238-84-2111
Address5-1 Mamanoue, Nagai-shi, Yamagata-ken 993-8601
WebsiteOfficial website
Sakura by the Mogami River

Nagai (長井市, Nagai-shi) is a city located in Yamagata Prefecture, Japan. As of 1 February 2020, the city had an estimated population of 26,466 in 9940 households,[1] and a population density of 120 persons per km². The total area of the city is 214.67 square kilometres (83 sq mi).


Nagai is located in mountainous southern Yamagata Prefecture. The Mogami River passes through eastern portion the city, and the northwest end of the city includes Mount Asahi.

Neighboring municipalities[edit]


Per Japanese census data,[2] the population of Nagai peaked around 1950, and has gradually been decreasing over the past 70 years.

Historical population
1920 26,797—    
1930 31,359+17.0%
1940 32,182+2.6%
1950 37,429+16.3%
1960 36,211−3.3%
1970 33,221−8.3%
1980 33,286+0.2%
1990 33,260−0.1%
2000 31,987−3.8%
2010 29,476−7.9%


Nagai has a Humid continental climate (Köppen climate classification Cfa) with large seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters. Precipitation is significant throughout the year, but is heaviest from August to October. The average annual temperature in Nagai is 11.2 °C. The average annual rainfall is 1688 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.0 °C, and lowest in January, at around -1.6 °C.[3]


The area of present-day Nagai was part of Dewa Province and was part of the holdings of Yonezawa Domain under the Edo period Tokugawa shogunate. The village of Nagai was created within Nishiokitama District, Yamagata with the establishment of the modern municipalities system on April 1, 1889. Nagai merged with the neighboring villages of Toyoda, Hirano, Nishine and Isazawa on November 15, 1954 to form the city of Nagai.


Nagai has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 16 members. The city contributes two members to the Yamagata Prefectural Assembly shared with Nishiokitama District. In terms of national politics, the city is part of Yamagata District 2 of the lower house of the Diet of Japan.


The economy of Nagai is based on agriculture and light manufacturing of electronic and robotic components and pharmaceuticals.


Nagai has six public elementary schools ad two public middle schools operated by the city government and two public high schools operated by the Yamagata Prefectural Board of Education.



JR logo (east).svg East Japan Railway Company - Yonesaka Line

Yamagata Railway logo.png Yamagata Railway Company - Flower Nagai Line


International relations[edit]

Twin towns — Sister cities[edit]

Notable people[edit]


  1. ^ Nagai City official statistics (in Japanese)
  2. ^ Nagai population statistics
  3. ^ nagai climate data
  4. ^ a b "International Exchange". List of Affiliation Partners within Prefectures. Council of Local Authorities for International Relations (CLAIR). Archived from the original on 4 March 2016. Retrieved 21 November 2015.

External links[edit]