|Length||249.6 km (155.1 mi)|
|North end||National Route 13 in Yonezawa, Yamagata|
|South end||National Route 123 in Mashiko, Tochigi|
|National highways of Japan|
Expressways of Japan
- "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. Retrieved 19 February 2020.
- Media related to Category:Route 121 (Japan) at Wikimedia Commons
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