Płońsk County (Polish: powiat płoński) is a unit of territorial administration and local government (powiat) in Masovian Voivodeship, east-central Poland. It came into being on 1 January 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Płońsk, which lies 63 kilometres (39 mi) north-west of Warsaw. The only other town in the county is Raciąż, lying 25 km (16 mi) north-west of Płońsk.
The county covers an area of 1,383.67 square kilometres (534.2 sq mi). As of 2019, its total population is 87,183, out of which the population of Płońsk is 22,130, that of Raciąż is 4,384, and the rural population is 60,669.[1]