677600。 According to Yunnan Post Office, the postal code of Yongde County, lincang, Yunnan Province is 677600. Yongde County, which belongs to lincang, Yunnan Province, is located in the northwest of lincang, with an area of 71.5km from east to west and 75.8km from north to south, with a total area of 3,220km2, with mountainous area accounting for 95%.