A url ending with .mx tells you the site is located in which country?

.mx is the Internet country code top-level domain (ccTLD) for Mexico, which in 2009 was re-opened to new registrations by NIC México.

Mexico has approximately 81 million Internet users representing 70.1% of the population. The country ranks 10 in number of Internet users in the world. Mexico is the country with the most Internet users among Spanish speaking countries and is currently experiencing a huge surge in demand for broadband Internet services.