 As of 2016 its total population is 38,515, out of which the population of Żuromin is 8,987, that of Bieżuń is 1,910, and the rural population is 28,987.Żuromin County is bordered by Działdowo County to the north-east, Mława County to the east, Płońsk County to the south-east, Sierpc County to the south-west, and Rypin County and Brodnica County to the west.The county is subdivided into six gminas (three urban-rural and three rural).