Is there any API so that all countries and the passing country receive all states / region and again pass the state / region, all cities in it

Question

I am creating a webpage in asp.net where I have to fill in all the countries in the drop down list. When choosing one country, I need to fill in all the states / region in this country with another drop-down list. finally, when choosing a state / region, it is necessary to fill in all the cities in this state / region in another drop-down menu. is there any api to achieve this. Can someone help me.

Answer 1

http://www.geonames.org/export/web-services.html

http://api.shopify.com/country.html

http://api.drupal.org/api/drupal/includes%21locale.inc/function/country_get_list/7

You may need several APIs for this. Hope this helps.