Advice on resources to accurate predict property taxes when evaluating a property?

[Daniel Grabowski]

I understand you can look at Zillow and leverage public county tax databases to find semi-accurate property tax numbers with comparables. I might be looking for the easy button here, but is there an accurate single-source resource for determining property taxes quickly when evaluating properties? I have found something like this site, but it seems to be fairly inaccurate.. just trying to automate my evaluation process and make it faster - finding the right property is a numbers and right markets game, and I need to evaluate at scale...