From the Wikipedia page 
Mława County (Polish: powiat mławski) is a unit of territorial administration and local government (powiat) in Masovian Voivodeship, east-central Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and only town is Mława, which lies 109 kilometres (68 mi) north-west of Warsaw.
Mława County is bordered by Nidzica County to the north, Przasnysz County to the east, Ciechanów County and Płońsk County to the south, Żuromin County to the west, and Działdowo County to the north-west.