Finding and contacting absentee owners

[Tyler Brown-Lewis]

For my ppl on BP what is the best way you've found to get the actual information of an absentee owner or potential seller (their actual mailing address, phone number or even email)? I've checked county auditors list and found owners but the road is stopping there after solving the obvious which is personal or company name listed and basic info the auditor provides which is usually the same address that's vacant. Aside from leaving a letter in the mailbox, are there any good public information websites you can refer or other strategies to get in contact with people? Any help is greatly appreciated.