Santiago de la Monclova, more commonly known as Monclova, is a city and seat of the surrounding municipality of the same name in the northern Mexican state of Coahuila. According to the 2010 INEGI census there were 198,819 inhabitants in the city and 216,206 in the municipality. Its metropolitan area (Monclova, Frontera, Castaños) had 294,191 inhabitants and has a population density of 29.88 inhabitants per square kilometers. Monclova is the third largest city in Coahuila (after Saltillo and Torreón).