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With a total length of 638.4 kilometers (396.7 mi), National Route 9 is the second longest national highway in Japan, being shorter than onlyNational Route 4.
^"一般国道の路線別、都道府県別道路現況" [Road statistics by General National Highway route and prefecture](PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved19 February 2020.
^一般国道9号 (in Japanese). Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism. Retrieved27 November 2010.
^一般国道9号 (in Japanese). Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism. Retrieved27 November 2010.