This is a link to a map of the Districts in Poway. District 3 is the yellow section in the middle of the city.
Or, go the Election Districts portion of Poway's GIS viewer and enter your address by clicking on the upper right button that looks like a house with Corinthian columns.
Here is a generic link to Poway's GIS viewer. This is a powerful tool that give you detailed information about land use in the city. I'd recommend spending some time with the multitude of map overlays to explore the various aspects of things like City zoning, flood and fire areas, housing overlays, etc.