Japan National Route 21

National Route 21 (国道21号) is a national highway connecting Mizunami, Gifu Prefecture and Maibara, Shiga Prefecture in Japan.

Route data

 * Length: 101.4 km
 * Origin: Mizunami (originates at junction with Route 19)
 * Terminus: Maibara (ends at Junction with Route 8)
 * Major cities: Minokamo, Kakamigahara, Gifu, Ōgaki

History

 * 4 December 1952 - Designation as First Class National Highway 21 (from Mizunami to Maibara)
 * 1 April 1965 - Designation as General National Highway 21 (from Mizunami to Maibara)

Intersects with

 * Gifu Prefecture
 * Route 19
 * Route 248
 * Route 41
 * Routes 22 and 156
 * Route 157
 * Routes 258 and 417
 * Route 365
 * Shiga Prefecture
 * Route 8