World Population Data Sheet
Provided by the Population Reference Bureau, the World Population Data Sheet (available in PDF) contains the latest population estimates, projections, and other key indicators for over 200 countries. A nice feature of the website is the "Datafinder" a search tool, accessible from the main menu at the top of the page. It can be used to find data by country, region, sub-region or worldwide. More reports and quick facts are also available at the site's home page. Resource also listed under Statistical Data Resources category.