Tecámac is a municipality in State of Mexico in Mexico. The municipality covers an area of 157.34 km². The municipal seat lies in the town of Tecámac de Felipe Villanueva. Its largest town, Ojo de Agua, with a population of 242,283 inhabitants, is the largest locality in Mexico that is not a municipal seat.
As of the 2010 census, the municipality had a total population of 364,579 inhabitants.