Wyszków county is one of county of Masovian Voivodship with capital in Wyszkow, area 876 km² and population 71,400 (2003). Wyszkow county consist six communes: Branszczyk, Dlugosiodlo, Rzasnik, Somianka, Wyszkow and Zabrodzie.

First time county was created in 1956 as one of county of Warsaw Voivodship and operated to 1975. After new administrative division of Poland in 1999 Wyszkow county was renewed.