Hey @Rob Grove
The thing that is great about investing in real estate is it teaches you to be resourceful. If you don't know the answer you have two options: 1.) find the answer or 2.) quit looking for the answer.
I will share some Gold nuggets that I have come across for researching properties, addresses and owners of properties. I can usually always find the owner, their address, and a phone number of a typical homeowner. (investors on the other hand are a little more savvy if they do not want their information any where on the property)
Zillow.com: ( I am sure you know) is Awesome. However, people do not seem to know about the trick I am about to share with you. Click on the "more" tab under discription the description. There will be a link to the county website. Then once at the county website (they're all similar but different) do a property search. It will ask for the parcel number. The parcel number is listed on Zillow. This trick will give you the owner's name and most cases address too.
Once you have the owners name, Google it, facebook it, whitepage it. Any thing you can think of. Type it in to all search engines. Often time you can find out everything about the owner, including a phone number, business and known associates and family. There are a lot of paid websites that will find people for you and everything about them for a monthly fee. (instantcheckmate.com) It is kind of scary, how easy all of this information is to get.
If you found this information useful let me know.