Sri Lanka Postal Codes Postal Codes of Sri Lanka:Central ProvinceEastern ProvinceNorth Central ProvinceNorth Western ProvinceNorthern ProvinceProvince of UvaSabaragamuwa ProvinceSouthern ProvinceWestern Province About Sri Lanka Capital: Colombo Currency: Rupee (LKR Languages: Sinhala (official and national language) 74%, Tamil (national language) 18%, other 8% Population: 21,513,990 Area: 65,610 KM2