Hello,
Extension and Integration 3rd party APIs are my forte. I will certainly assist you to customize extension regarding Country dependent State/Province, District, Sub District list in your website.
Here I would apprise you that I have 7 years of experience in Magento (v1.9 & 2.0), PHP(v5.5 & 5.6), MySQL, HTML/HTML5, CSS/CSS3, Ajax, JQuery, Bootstrap v3, JavaScript etc. For more details, please review my profile.
I am readily available to commence this project. Please, do ping me to discuss further.
Regards,
Brijesh R, Magento Expert