Population of Bonn in 2025 was 323 336, making it one of the largest cities in North Rhine-Westphalia and the 18-19th-largest city in Germany. The population of Bonn has been slowly growing, from 292 234 in 1991 to 323 336. Bonn was the capital of West Germany from 1949 to 1990 and to this day still retains significant presence of the federal government.
Bonn metropolitan area
Bonn, together with Cologne and adjacent suburbs, forms a larger region of Cologne/Bonn which has more than 3 million inhabitants. Bonn is also part of the larger Rhine-Ruhr metropolitan region that has over 11 million inhabitants and is the most populous metropolitan region in Germany.