422400。 According to the postal code database query, the postal code of Wugang City, Shaoyang City, Hunan Province is 422400. China postal code adopts four-level six-digit coding structure, 42 represents Hunan Province, the third number 2 represents Shaoyang City, the fourth number 4 represents Wugang Post Office, and the last two digits 00 represent postal delivery sub-offices.