Can you clarify a few things on your question for me...
Are you trying to map the locations that you geocoded and aggregate them / count them up based on the planning zones (44 zones) and subzones (434 subzones)?
Is the problem that you need to match up the latitude and longitude points that you have from the reverse geocoding with GoogleMaps to identify which zone and subzone each point lies in?
Do you have a spatial data file for both zones and subzone boundaries (e.g., shapefile or KML)?
If you just need to match up the points to the polygon that they fall into, you should be able to do this in QGIS (free GIS program) and then bring the resulting table into Tableau for visualization and analysis.
If I've mis-understood your questions, let me know. If you can provide a bit more detail on your desired workflow and the necessary outcome that would be great.