Angarsk, city, Irkutsk oblast (province), southeast central Russia, on the Trans-Siberian Railroad. Founded in 1948, Angarsk grew rapidly as a major centre of oil refining and petrochemicals. The city’s industrial products include such goods as synthetic fibres, artificial fertilizers, plastics, boilers, and cement; there are also electro-engineering works and brewing facilities. Petroleum is piped from West Siberian fields to Angarsk’s refinery and petrochemical complex. Pop. (2006 est.) 245,699.