In the 2015 South Korean census, 37,423 individuals identified themselves as part of the Heungdeok Jang clan, and 21,973 individuals identified themselves as members of the Heungseong Jang clan, with a combined total of 59,396 members.
[1] The progenitor of the clan is considered to be Chang Yu (장유; 張儒)[b].
Chang Yu would rise the position of gwangpyeong sirang.
His son, Chang Yŏn-u, would serve the Goryeo government from the reign of King Seongjong to King Hyeonjong.
He served as deputy minister of war and fought the Khitans at Tongju.