Before the Second World War , Lessogorski was called Jääski and belonged to Finland. In addition to the eponymous Kirchdorf of Jääski belonged to the district municipality Jääski also svetogorsk (then Enso ) and the villages Lossewo ( Järvenkylä ) and Vozrozhdeniye ( Kavantsaari ). When the border was drawn in 1940 after the Winter War and again in 1944 after the continuation of the war , 85% of the municipal area of Jääski, including the church village and the important industrial site Enso, came to the Soviet Union . The areas remaining on the Finnish side were divided up in 1948 between Joutseno , Ruokolahti and the newly founded market town of Imatra. In the same year Jääski was renamed Lessogorski.
↑ a b Itogi Vserossijskoj perepisi naselenija 2010 goda. Tom 1. Čislennostʹ i razmeščenie naselenija (Results of the All-Russian Census 2010. Volume 1. Number and distribution of the population). Tables 5 , pp. 12-209; 11 , pp. 312–979 (download from the website of the Federal Service for State Statistics of the Russian Federation)