Tianjiazhai is a town located in the Huangzhong District of Xining, within the Qinghai province of China. It serves as a local administrative division within this region.
According to 2010 census data, the town had a total population of 38,229 residents. This demographic was composed of 20,272 males and 17,957 females, with age distributions including 8,042 individuals under the age of 14, 27,540 people between the ages of 15 and 65, and 2,647 residents over the age of 65.