Please tell me Sri Lanka's Postal Code...?

As I know there isn't specific postal code to sri lanka.. for each city in sri lanka there is a post code.. like for an example For Kandy 20000.. here is a link with all the list of post codes in here a href="http://srilanka.tamu.edu/postcode.html.." rel="nofollow"http://srilanka.tamu.edu/postcode.html../a