Call the agent whose telephone number appears on the sign in the front yard.
No sign in the front yard?
Knock on the door and say, "I wanna buy your home."
The person answering the door will respond with one of the following:
"how much you offering?" and "Show me your MONEY!"
"Abner, come to the door, we've caught another one!"
or, may favorite...
"Call my REALTOR."
There are other options, but I think you know you can type on that keyboard and access the tax records. You must have discovered the owner does not WANT to be revealed.
So, tell us, why do you REALLY want to know?
Are you one of those asset recover folks?