Yes, Alexa publishes a list of the top 500 sites at http://www.alexa.com/topsites and the top 500 sites in several countries at http://www.alexa.com/topsites/countries. You can view the top 50 sites for free and the top 500 sites with one of our Alexa Pro subscriptions.
More extensive lists of top sites by country or globally are available programmatically through the Alexa Top Sites service at http://aws.amazon.com/alexatopsites/.
The number of sites available from the API service depends on how much data we have in each country. For example, the lists might contain the top 300,000 or so sites in the U.S., the top 15,000 or so sites in Brazil and the top 10,000 sites in Sweden.