Tomsk (Russian: Томск; IPA: [tomsk]) is a city and the administrative center of Tomsk Oblast, Russia, located on the Tom River. One of the oldest towns in Siberia, Tomsk celebrated its 400th anniversary in 2004. Population: 522,940 (2010 Census preliminary results); 487,838 (2002 Census); 501,963 (1989 Census).