Europa World: Covers political and economic information in over 250 countries and territories, from Afghanistan to Zimbabwe. Updated regularly!
Country Profiles (Business Source Complete): Search country profiles in Business Source Complete. Shorter, monthly updates supplement the yearly country reports. This link limits results to only country profiles, so all you need to do is search for your country's name.
UN Statistical Yearbook: Find demographic, economic, environmental (and more) by region or country
UN Data : Search for indicators by member country
Food and Agriculture Organization of the United Nations Country Profiles: Find statistical profiles and more on topics ranging from pasture land to hunger.
World Bank: Data by Country: Find statistics on development indicators, economic data, and more.
OECD iLibrary (Organisation for Economic Co-operation and Development) : Contains extensive statistical data which can be downloaded into spreadsheets. The database is especially rich in annual economic surveys of member countries, industry reports, and statistical reports.