The first two digits 03 represent Shaanxi Province, the third digit 1 represents Linfen Postal District, the fourth digit 6 represents Hongtong County, and the last two digits 00 represent specific delivery areas. Hong Tong is one of the cradles of ancient civilization in China, and is called "the hometown of China people". Hongtong County, with beautiful mountains and rivers and graceful figures, was called "the state of propriety and righteousness" and "the holy state" in ancient times, and is one of the birthplaces of Chinese civilization for 5,000 years.