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Płońsk [pwɔɲsk] ( listen) (Yiddish: פּלאָנסק [Plonsk]) is a town in north-central Poland with 22,500 inhabitants (2010).
It is situated in the Masovian Voivodeship (since 1999); previously, in was in Ciechanów Voivodeship (1975–98). It is home to a yearly open theatre festival (held in the summer).
Płońsk gained city rights from the prince Siemowit IV of Masovia some time between 1399 and 1412.
The church and the old monastery of Calced Carmelites were founded before 1417 by the prince Siemowit IV of Masovia and his wife Aleksandra, Jogaila's sister.
The Memoriał Andrzeja Trochanowskiego one-day cycling race is based in Płońsk. The race takes place annually on May 1.
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Coordinates: 52°38′N 20°23′E / 52.633°N 20.383°E