Demographic features of the population of the Soviet Union include vital statistics, ethnicity, religious affiliations, education level, health of the populace, and other aspects of the population.
During its existence from 1922 until 1991, the Soviet Union had one of the largest populations in the world. When the last census was taken in 1989, the USSR had the third largest in the world with over 285 million citizens, behind China and India. The former nation was a federal union of national republics, home to hundreds of different ethnicities. By the time the Soviet Union dissolved, Russians were the largest ethnic group by making up nearly 51% of the country. The remaining 49% of Soviet citizens identified with a variety of groups, including Ukrainians, Belarusians, Uzbeks, Kazakhs, Georgians, Jews, etc.