The present "Iwaki City" started as the merger of 14 municipalities on October 1, 1966. The city was the third hiragana city, following Chino, Nagano and Mutsu, Aomori. The area was the largest in Japan at the time. The city works as an industrial hub of Tōhoku region, and is rich in sightseeing resources. About 7.6 millions sightseers visit the city a year (H.17).
The Iwaki(いわき)'s origin dates back to the Yamato period. Yamato government constructed a barrier in Iwaki for invasion of Emishi, who were Japanese northern dwellers.
When the Taika Reform(A.C.645) was enforced, the central government placed "Iwaki district (磐城郡)" in the northern part of the present city and "Kikuta district (菊多郡)" in the southern part.
In 653, the Iwaki district incorporated with a part of Taga Province and became Iwaki district(岩城評).
In 718, Iwaki Province (岩城国) was placed, which was composed of five districts with Mutsu Province: Iwaki (岩城), Shineha, Namekata, Uta, Watari and Kikuta which was given from Hitachi Province. Shineha was the present Naraha. Namekata and Uta were the present Soma. Watari was the present Watari, Miyagi. The area of the present Iwaki City was composed of Kikuta and Iwaki (岩城 or 磐城).
In the late 11th century, Iwaki clan (岩城氏) of Hitachi Province invaded Iwaki district (磐城郡) and divided it into four districts of Yoshima, Iwasaki, Iwaki, Naraha. The clan settled Iwaki district.
In 1189, Minamoto no Yoritomo appointed Iwaki Taro Kiyotaka (岩城太郎清隆) to jito of Yoshima.
In 1532, the Battle of Kidogawa
In 1590, Toyotomi Hideyoshi came in Tohoku region and demanded sword hunt and kenchi.
In 1600, Iwaki Sdataka (岩城貞隆) didn't fight in Ieyasu's corner on the Battle of Sekigahara. As a result, Iwaki clan was ousted, newly Torii Tadamasa was appointed as the load of Iwakitaira han (磐城平藩, old Iwaki Province) by Tokugawa Ieyasu. Ieyasu put Tadamasa of his Fudai in fear of Date Masamune of Sendai han. The han has about 100 thousand goku.
In 1603 Edo period, Torii Tadamasa started to construct Iwakidaira Castle in Taira.
Izumi han (1634) and Yunagaya (1670) hans were placed, following Kubota(1622) and Tanagura (1634) hans.
In 1684, Kubota han's territory was confiscated.
In 1860, Ando Nobumasa of Iwakitaira han was appointed as a Roju of Tokugawa shogunate. In 1862, he was wounded near the sakashitamon-gate in Edo Castle.
In the Boshin War, the hans in Iwaki lost and were controlled by the new government (新政府). In 1871, Abolition of the han system was practiced and the hans in Iwaki became ken(means old prefectures): Iwakitaira ken, Yunagaya ken and Izumi ken. These hans were incorporated to Iwamae(Iwasaki) Prefecture (磐前県) and to the current Fukushima Prefecture (1876).
In 1896, Iwaki Bank and Taira Bank were established.
In 1897, Nihon Tetsudo filled in the inner moat of Iwakidaira Castle and made Taira Station. Jōban coalfield, which was the biggest coalfield in Honshū and the nearest from Japanese capital Tokyo, was started to exploit it under the Fukoku kyōhei policy. Then Iwaki had developed as an industrial city for exploitation of the coalfield. Jōban Line was made for the baulage of the coal. Its fishery, forestry and agriculture also developed.
After WWII, the Jōban coalfield was closed, but it made good use of its left vast hot water under exploitation and constructed the Spa Resort Hawaiians, which is a hot spring resort.
The present city (いわき市) was incorporated on October 1, 1966, with the merger of 14 municipalities (5 cities, 4 towns and 5 villages). The cities were Taira (平), Uchigō (内郷), Iwaki (磐城), Nakoso (勿来), and Jōban (常磐); the towns, Yotsukura, (四倉) Tōno (遠野), Ogawa (小川) and Hisanohama (久之浜); and the five villages were Yoshima (好間), Miwa (三和), Tabito (田人), Kawamae (川前) and Ōhisa (大久). Taira was chosen as the location for City Hall and other administrative offices and continues to function as the centre of Iwaki. This stem from that Torii clan's castle town was Taira.
In April 1979, "Iwaki Number" as automobile numbr plate was set.
On April 1, 1999, the city was designated a "core city"
The city is located at the southern end of Tōhoku Region and close to Ibaraki Prefecture, (). The city covers a total area of 1,231.34 km², making it the largest city in Fukushima Prefecture and the tenth largest in Japan. Until April 2003, the area is no.1 in Japan. The city occupies around 8.9 percent of the total area of Fukushima Prefecture.
The eastern part of the city is made up of 60 kilometres of coastline which faces the Pacific Ocean and the western part goes through the Abukuma highlands and joins up with the centralpart of Fukushima Prefecture. The western part is a range of mountains and forests, occupies about 70 percent of the city. The rivers which flow to the east from the mountains have riverbeds with steep inclines which form the deep valleys of the Natsuigawa Gorge and the Shidokigawa Gorge. The scenery can be enjoyed throughout the seasons, especially the autumn colors of the gorges are beautiful. The eastern part of the city is terraces or plain and people concentrate there. The industrial zones spread around the downstream areas of the rivers which has a lot of nature untouched. There are seven beaches on the coastline, many sea bathers visit there. Off the coast of Iwaki Kuroshio Current(hot) and Oyashio Current(cold) meet there, is a very abundant fishing ground -Onahama Port. And the wind from the ocean is warm and wet.
Iwaki is situated in a temperate climate zone and has a moderate climate. The city's average temperature is 13.1°C (55.6°F) and its average annual precipitation is 1,383.0 mm. The highest recorded temperature in the city is 37.7°C (99.9°F), and the lowest recorded temperature is -10.7°C (12.7°F). The average year has 14.4 days with a high temperature over 25°C and only 3.1 days with a low temperature below 0°C, which is smaller compared to other Japanese cities. The city is rarely hit by typhoons, and experiences only 0.7 days with more than 10 cm of snowfall in the average year. The duration of bright sunshine is 2058.1 hours in average year.
Yumoto is a town that have developed as a stage town. Iwaki Yumoto onsen is one of the oldest onsens in Japan. There are many ryokans, Japanese traditional hotels, and Spa resort Hawaiians near the station.
Onahama is a port town many factories stand, and the gateway to Iwaki. There are an aquarium, some beaches or seaside restaurants.
Izumi is a residential town section. The other towns are Ueda, Nakoso, Uchigō, Yotsukura and so on.
There are thirteen zones in the city.
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Iwaki City has 130,814 households as of 2007. The average household has approximately 2.67 members. The number of males is 169,932 and the number of females is 180,187. The city has many people in their 50s and in their 40s compared to other age groups. The average age in Iwaki is 44.31. Now Japan has seriously dwindling birthrate and a aging society, and Iwaki is also no exception.
| zone | population | households | area | density |
|---|---|---|---|---|
| Taira | 99,901 | 38,685 | 109.88km² | 909.18/km² |
| Onahama | 77,857 | 29,182 | 87.64km² | 888.37/km² |
| Nakoso | 51,783 | 18,651 | 104.74km² | 494.39/km² |
| Jōban | 35,904 | 13,550 | 48.23km² | 744.43/km² |
| Uchigō | 28,214 | 11,462 | 31.62km² | 892.28/km² |
| Yotsukura | 15,686 | 5,284 | 63.73km² | 246.13/km² |
| Tōno | 6,404 | 1,913 | 104.53km² | 61.26/km² |
| Ogawa | 7,567 | 2,481 | 112.49km² | 67.26/km² |
| Yoshima | 13,597 | 5,319 | 26.69km² | 509.44/km² |
| Miwa | 3,676 | 1,107 | 214.90km² | 17.10/km² |
| Tabito | 2,117 | 713 | 158.07km² | 13.39/km² |
| Kawamae | 1,448 | 509 | 116.44km² | 12.43/km² |
| Hisanohama, Ōhisa | 5,965 | 1,958 | 52.38km² | 113.87/km² |
| total | 350,119 | 130,814 | 1231.34km² | 284.33/km² |
Statistics(2006)
Principal head offices in Iwaki
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Principal companies which have factories in Iwaki
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¤ *-mark indicates unofficial name.
Supermarkets and Big-box stores
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Jōban Line runs north and south in the city. The central station is Iwaki station (old Taira station). There are banks, business hotels and shops in front of the station. Many trains stop at the station in mid course between Sendai and Tokyo. East Ban'etsu Line links to Koriyama, but the users are few because highway buses are more convenient and cheaper than railway.
Highway buses
From Iwaki
Taira
Nakoso
Uchigō
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Onahama
Jōban(Yumoto)
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The others
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, hot spring and leisure park. Refer to Hula Girls







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Private
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International friendship and sister cities