 Both the municipality and city are commonly referred to as Nicolás Romero.Industrialization began here in the middle of the 19th century with factories like the “Molino Viejo” (now La Colmena), "Rio Grande" and "San Ildefonso" textile factories as well as the thread manufacturer Barrón, all of which are still in operation.This would continue through the 20th century with paper products and other types of production.