National Route 3 is a national highway in South Korea connects Namhae to Chosan.

Due to the separation of Korean peninsula, it de facto ends in Cheorwon by now.

It was established on 31 August 1971.

[1] South Gyeongsang Province North Gyeongsang Province North Chungcheong Province Gyeonggi Province Seoul Gyeonggi Province Gangwon Province Kangwon Province Hwanghae Province South Pyongan Province North Pyongan Province IS: Intersection, IC: Interchange