If I already have the Zip+4, I think I can use the Geo-coding to put the address on the map, but no conversion to ZIP+4 from Address/Zip. Did I miss anything?
I've never tried it, but could you use street geocoding? Take a look at:
Recently I have done some Proc Geocode on street level, this paper will pretty much answer all of your questions:
https://support.sas.com/resources/papers/proceedings10/332-2010.pdf
Regards,
Haikuo
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