Finding Owners for vacant houses

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So i been driving for dollars lately and i've been sending out letters to the absentee owners for those vacant properties but theres a couple of houses i been trying to figure out where the owners are. I searched in Property Appraisers, property shark, and any source of information where i can find the owners current address or any type of contact info but all i get is that address where the house is vacant but obviously no one lives there, kinda strange but i would like to hear from experts on how you find property owners because im new to this and been trying to get my first deal under agreement to wholesale. Any advice would be great and much appreciated. Thank you for your time.