City Cemetery #7 was located on the city's eastside bounded by Nevada, New Braunfels, & St. Anthony streets. It was sold in 1944 and the burials were relocated to San Jose cemetery. The gounds where city cemetery #7 once rested are now St. Gerard's Catholic School.
San Antonio Public Library has a small map of the area. San Antonio Genealogical Society has an index of the people who were once buried there.
Good luck in your research.