342500。 The postal code of Ruijin is 342500, "34" stands for Jiangxi Province, "2" stands for Ganzhou Postal District, "5" stands for Ruijin Post Office, and "00" stands for the specific delivery office (room) under Ruijin City. Ruijin is located in the southeast border of Jiangxi Province, and it is named after "Nuggets, Lucky Gold". Ruijin Prison was established in the first year of Tang Tianyou (904), and was promoted to county prison in the eleventh year of Nantang Baoda (953), with a history of 1000 years.