Kawasaki, Kanagawa

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Lore & Background

Kawasaki's history stretches back to the Japanese Paleolithic and Jōmon period, with archaeological evidence found only in the northwest Tama Hills. During the Nara period, the area came under Musashi Province, and by the Heian period, the Inage clan expanded here. The Heiken-ji Buddhist temple, better known as Kawasaki-Daishi, was founded in 1128, and a monzen-machi soon emerged. In 1611, Koizumi Jidayū had the Nikaryō Yōsui canal system built for irrigation. The Kawasaki station on the Tōkaidō was recognized in 1623 as the last of the 53 Tōkaidō stations. The Bakufu let bridges over the Tama collapse, forcing ferry connections to Edo, which laid the foundation for the city's development.

Reader's Guide

Kawasaki's rapid urbanization began in the Meiji and Taishō eras. In 1872, Kawasaki Station was established on the Tōkaidō Main Line, Japan's first railway line. On July 1, 1924, the independent city of Kawasaki with 48,394 inhabitants was formed through a merger with the city of Daishi and the village of Miyuki. During World War II, the city was bombed three times by the USAAF between April and July 1945. The most serious attack was an area bombing with Napalm bombs on April 15, 1945, destroying around 35% of the urban area and claiming 1,520 dead and 8,759 injured. Since the 1950s, residential areas for commuters have been created in the northeastern part of the city. On April 1, 1972, Kawasaki became a decree-designated city with 5 districts. In 1973 the population exceeded the million mark. In June 2008, Kawasaki became the second Japanese government-designated city after Hiroshima to allow foreigners to participate in municipal referendums.

Did You Know?

• Kawasaki is the only city in Japan with more than one million inhabitants that is not a prefectural capital.
• The Heiken-ji Buddhist temple, better known as Kawasaki-Daishi, was founded in 1128.
• On April 15, 1945, a Napalm bombing destroyed around 35% of Kawasaki's urban area, killing 1,520 people.
• In June 2008, Kawasaki became the second Japanese government-designated city after Hiroshima to allow foreigners to participate in municipal referendums.
• The oldest Okinawans Association in Japan was founded in Kawasaki in 1924.

Geographic Identity and the Industrial-Residential Divide

Kawasaki occupies a distinctive position in Japan's urban landscape. Stretching as a narrow band between Tokyo in the northeast and Yokohama in the southwest, the city lies on the right bank of the Tama River, which flows into Tokyo Bay. Its total area spans 142.70 km2, with a population density of 10,000 persons per km2. The city's geography creates a clear internal divide: the eastern area along the coast of Tokyo Bay is a densely populated industrial zone, part of the Keihin Industrial Zone, while the western districts in the Tama Hills consist largely of residential areas for commuters. Kawasaki borders Tokyo's Ōta and Setagaya wards to the northeast, several Tokyo Prefecture cities to the northwest, and four Yokohama districts to the southwest. The completion of the Tokyo Bay Aqua-Line in December 1997 added Kisarazu in Chiba Prefecture as a neighbor across the bay. The climate is classified as humid subtropical (Cfa) under the Köppen system.

From Ancient Hills to Edo-Era Crossroads

The human story of Kawasaki stretches back to the Paleolithic and Jōmon periods, with archaeological traces preserved only in the northwest Tama Hills. Much of the urban land is geologically young due to shifting river courses and coastline changes. In the seventh century, the Ritsuryō legal system placed the area within Musashi Province. A pivotal moment came in 1128 with the founding of Heiken-ji temple (Kawasaki-Daishi), around which a bustling pilgrim-supply district grew. During the Edo period, the 1611 construction of the Nikaryō Yōsui canal for irrigation and the establishment of Kawasaki-juku on the Tōkaidō road elevated the area's strategic importance. The Bakufu deliberately let Tama River bridges collapse, forcing ferry connections to Edo that stimulated local commerce. The modern era accelerated with the 1872 opening of Kawasaki Station on Japan's first railway line, the Tōkaidō Main Line, and the 1924 merger that created the independent city of Kawasaki with a population of 48,394.

War Destruction and the Postwar Rebuilding

Kawasaki bore a heavy burden during World War II. As early as 1942, the city became the target of the first mainland bombing by the U.S. military, a consequence of its heavy and chemical industrial complex supplying Japan's war efforts across Asia and the Pacific. Between April and July 1945, the U.S. Army Air Forces struck the city three times. The most devastating raid on April 15, 1945, employed Napalm in an area bombing that obliterated roughly 35 percent of the urban area, destroyed 9.3 km2 of land, killed 1,520 people, and injured 8,759 more. The devastation concentrated around the train station and the industrial area at the port. In the decades that followed, the city rebuilt and transformed. From the 1950s onward, new railway lines linked northeastern residential districts directly to Tokyo's centers. By 1973, the population had surpassed one million. In recent years, deindustrialization has seen former factory zones converted into multi-family residential areas, driving further population density increases.

A Million-Strong City Without a Capital Title

Kawasaki holds a singular distinction in Japanese urban geography: it is the only city in the country with a population exceeding one million that does not serve as a prefectural capital. As of October 2017, its estimated population stood at 1,503,690 across 716,470 households, making it the second most populous city in Kanagawa Prefecture after Yokohama and the eighth most populated in all of Japan. The city's administrative structure evolved significantly over time. In 1889, the town of Kawasaki was formally created under the new municipal system. The 1912 establishment of the Tama River as the boundary between Kanagawa and Tokyo prefectures shaped its modern borders. On April 1, 1972, Kawasaki was elevated to decree-designated city status with five districts, and in 1982, Miyamae and Asao were carved out of Takatsu and Tama to bring the total to seven wards. The city also hosts notable minority communities; Korean peninsula residents contributed to railway construction and post-bombing road repairs, while in 1924 the oldest Okinawans Association in Japan was founded here.