For most sites, the ‘Visitors by Country’ estimates come from our global Alexa Traffic panel. For sites with Certified metrics, the site owner can choose to have the ‘Visitors by Country’ information based on directly measured data for the site. As sites’ traffic ranks grow farther away from 1, the amount and quality of the data lessens. Past 100,000, we have a very limited amount of data.
We display the site’s traffic rank in the country where the greatest proportion of its users are located (based on the Alexa Traffic panel or Certified Site Metrics). This might not be the same country in which the website is located.
If we do not display a country traffic rank for a site, it means that we do not have sufficient traffic panel metrics to do so. Keep in mind that the standard Alexa traffic rank is the GLOBAL traffic rank, not the country one. The country traffic rank is only displayed if there are enough panel metrics. You can always get your site’s metrics Certified to gain access to the directly measured country traffic rank for your site.