Madarcos is a municipality of the Community of Madrid, Spain. It has an area of 8.46 km² with a population of 49 inhabitants and a density of 5.79 inhabitants / km² it is the people with fewer people in the Community of Madrid. It borders the municipalities of the Sierra Horcajo north and northwest; Horcajuelo of the Sierra and the Rincon Prádena east; Puentes Viejas south, and Gandullas Piñuécar- west.