Major cities and villages it passes through include: Kashiwa, Toride, Tsuchiura, Ishioka, Mito, Hitachi, Iwaki, Tomioka, Ōkuma, Sōma, Watari, Iwanuma
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Tōkaimura (the first nuclear power plant of Japan), Ōkuma (center of the Fukushima Daiichi nuclear disaster) and Naraha (location of the Fukushima Daini Nuclear Power Plant) are located on adjacent of Route 6.
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During the Ritsuryō period, roads from Kinai to the Tagajō were divided into two: the Tōkaidō eastern sea road (via Nagoya, Hamamatsu, Tokyo and Mito) and the Tōsandō eastern mountain road (via Gifu, Shiojiri, Takasaki and Utsunomiya).
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