Sońsk is a village in Ciechanów County, Masovian Voivodeship, in north-central Poland. It is the seat of the gmina (administrative district) called Gmina Sońsk.
History During the German occupation in World War II, in 1941, the occupiers established a forced labour camp for Poles, Jews and Russians in the village. Some prisoners were executed. In 1944, the camp was dissolved and surviving prisoners were deported to Germany.
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