How to Find Owners of Abandoned Houses

[Deshon Smith]

I have a list of properties of abandoned houses and I researched them on the county website to find the name of the owners and the amount they owe in taxes, but what next.  I have the name of the owner, but how do I find them in order to contact them?  I searched on whitepages, but no luck.  Would it be worth my time to send a yellow letter to the abandoned house in hopes it would be forwarded or is there a better way to locate these people?  Thanks to all suggestions.