Where is El Sagrario formerly known as Santo Domingo located in Zacatecas, Mexico

Does anyone know what town El Sagrario is located in Zacatecas City, Zacatecas, Mexico? I am trying to pin down the town so that I can search my relatives that were baptized there. And does any one know where I can get a detailed map of Zacatecas showing the little towns, in particular, around Zacatecas City? Thank you in advance for your help. Anna