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Ciudad Madero is a coastal city located on the Gulf of Mexico in the southeast of the Mexican state of Tamaulipas. It is the seventh most populous city in the state, with a census-estimated 2015 population of 209,175 within an area of 18.0 square miles (46.6 km²) the city is the third-largest in the Tampico metropolitan area. It is also an important center for oil refining.