[Google Maps API v2] Using Geolocation to determine a custom territory

Currently, I have an application that lets the user click on an
address and a new browser window opens showing the address on a map.
We use this to determine territory codes for our business model. For
example, Harris County Texas is divided into 5 territories. User
clicks on an address in Harris County and a map opens showing the
entire county and a red pin for the address, from this they can tell
what the territory code is and they type the code into a textbox.

I would like to automate that so the territory code can be determined
by the application. I know how to get the geolocation from an address
and vice-versa, but I don't know how to map out our custom territory
areas.

Any pointers on where to start?

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