The postcode of Yibin City is 644000. According to the regulations of the State Post Bureau, the postal code generally consists of six digits, the first two digits represent provinces, autonomous regions or municipalities directly under the Central Government, the middle four digits represent county-level cities, districts, counties or subdistrict offices, and the last digit is usually 0, 64 in Sichuan Province and 40 in Yibin City.