How to find an owners phone number?

[Robert Bacher]

I drive for dollars and when I find a place I'm interested in, I know how to find the owners name and address.  When I try looking for their phone numbers it's like running into a brick wall.  Does anyone have any suggestions on how I can get the phone numbers?  I have tried searching their name and location through google to no luck.  Also, what do you think about the idea of just knocking on their personal residence or leaving one of those door knob hangers letting them know I'm interested in their property?  

Thanks for reading.

Robert

wholesaling, BRRRR, direct marketing, Missouri, St. Louis, Jefferson County, Arnold, Hillsboro, Festus, Fenton,