Maintained as a ‘hobby’ by Johan van der Heyden, this web site contains a prolific amount of demographic and socio-economic data for the world as well as statistics broken down by country and city. Browse through the site and you’ll get a feel for the enormous amount of data that is accessible. There’s even a ‘links’ section if you’re interested in directly accessing the data from various statistical agencies.
GeoHive, a site with geopolitical data, statistics on the human population, Earth and more. The main kind of data you can find here is population statistics of regions, countries, provinces and cities. Next to that there are some statistics on economic factors like wealth, infrastructure; statistics on natural phenomena.
Visit GeoHive: http://www.geohive.com/