Freiburg in Breisgau , usually called simply Freiburg, is an independent city in the state of Baden-Württemberg in Germany. With a population of about 231,848 (as of 2021), it is the fourth-largest city in that state after Stuttgart, Mannheim and Karlsruhe. Its built-up area has a population of about 355,000 (2021) while the greater Freiburg metropolitan area ("Einzugsgebiet") has about 660,000 (2018).