Leśno, Wejherowo County  Leśno is a village in the administrative district of Gmina Szemud, within Wejherowo County, Pomeranian Voivodeship, in northern Poland. It lies approximately south-east of Szemud, south of Wejherowo, and west of the regional capital Gdańsk. For details of the history of the region, see "History of Pomerania". The village has a population of 478.