How to determine whether an address falls within kml map boundaries

[Taylor_Felt2]

I am trying to use my kml map layer to determine whether an added address falls within or outside of the boundaries to determine if they qualify for a rebate.

I’m not able to find any documentation and since there is no table to reference, I am considering creating a table with zip codes that roughly correlate to determine whether they qualify or not. Any suggestions on the best way to accomplish this?