dropdownlist for country,state and city

[simons24]

i need open source for dropdownlist for country,state and city as same as in below link

http://www.genuinematrimony.com/register.php

[mindfullsilence]

here's what I found on a quick search:
http://www.noboxmedia.com/demos/AJAX_country_area_list/index.php
Don't know about the zip; but not likely something that would be hard to code; just time consuming.