Madero, formally Ciudad Madero, is a city and its coextensive municipality in the state of Tamaulipas, Mexico. The city is located at 22.27°N, 97.83°W in the extreme southeastern part of the state, on the Gulf of Mexico, just north and east of Tampico but still on the banks of the Río Pánuco, and forms part of the conurbation that includes the municipalities of Tampico and Altamira in Tamaulipas, as well as Pánuco and Pueblo Viejo in the state of Veracruz, across the river to the south. Ciudad Madero is named after Mexican president and hero Francisco I. Madero. According to the 2005 INEGI census, the population of Ciudad Madero was 193,045, and its area was 46.6 km² (17.99 sq mi). It is the sixth-largest city in the state in population.