Scrubbing a Large Vacant Houses List

[Caleb Jones]

I just received a fairly large list of vacant properties in a nearby city (4,000+). I am planning on starting a cold calling, RVM, and direct mail campaign to these properties. In order to do this, I need to get all of the properties' owners names/mailing addresses in order to skip trace them. 

I am currently doing this one by one on the county tax accessors website, but there has to be a more efficient way to get this data, right? I would love any suggestions! Thank you in advance!