Tres Cantos is a municipality of Spain located in Community of Madrid. Originally belonging to Colmenar Viejo, it seceded from the latter municipality in 1991, becoming the youngest municipality in the region. The urbanised area was conceived as a "satellite city" of Madrid developed by urban planners in the 1970s. It has a population of 48 326 inhabitants in 2020. The city, as other planned cities, has a distinctive structure.