Birobidzhan is a town and the administrative center of the Jewish Autonomous Oblast, Russia, located on the Trans-Siberian Railway, near the China-Russia border. As of the 2010 Census, its population is 75,413, and the national language is Yiddish. In 1939 the Jewish population made up less than twenty percent of the overall population. Shortly after World War II, the Jewish population in the region reached its peak of about 30,000. As of the mid-2010s, only about 2,000 Jews remain in the region, making up about one half of a percent of the population.