Zhangjiazhuang Township () is a rural township located in Dingxing County, under the administration of Baoding, in the central part of Hebei Province, China. According to the 2010 census, the township had a population of 16,330 people and covered a total area of 24.00 square kilometers, yielding a population density of approximately 680 inhabitants per square kilometer.
According to census data from 2010, the township's population was made up of 48.7% males (7,945) and 51.3% females (8,385). The age distribution consisted of 17.9% (2,919) aged 0âÂÂ14 years, 72.2% (11,793) aged 15âÂÂ64 years, and 9.9% (1,618) aged 65 years and over.