Note that there are actually currently TWO countries called Congo - the Democratic Republic of Congo (the DRC), called Congo Kinshasa, and the Republic of Congo, called Congo Brazzaville.
World Factbook (CIA) The CIA's handbook of basic geographical and statistical information on the nations of the world. Includes map.
Country Background Notes.(U.S. Department of State) Background Notes are updated/revised by the Office of Electronic Information and Publications of the Bureau of Public Affairs as they are received from regional bureaus.
Country and Regional Information from the International Monetary FundIMF reports arranged by country and region
World Data Analyst from Britannica - Create tables and charts comparing countries across multiple statistical categories, or focus on statistics for a single country. Choose from current or historical data.
World Health Organization - Health related statistics for 194 member states.
UN Member States