Calera is one of the 58 municipalities in the Mexican state of Zacatecas. It is located on the central part of the state of Zacatecas and it is bounded by the municipalities of General Enrique Estrada, Fresnillo, Villa de Cos, Pánuco, Morelos and Zacatecas. The municipality covers a total surface area of 389 square kilometers (150 sq mi).