Identifying owner of abandoned property

[Ryan Leake]

Happy Friday everyone! 

This is for all those who real estate detectives that may have some advice for me on how to reach the owner of an abandoned property. 

Here's the situation:

I found a run down house in a nice neighborhood with all the tell-tale signs of an absentee owner (piles of unopened mail in mailbox, tall unmaintained grass, and even some cracked windows). 

I knocked on the door, no answer. I sent hand written letters to the subject property, as well as the house that I believe the true owner lives, no answer. My question is:

Is there anything else I can do to try to identify the owner of this asset? 

(p.s. I've thought about calling someone that works for the city, but I'm uncertain if 1) it's appropriate and 2) that person exists.)

Open to any and all advice! Thanks for taking the time to consider the situation and provide your insights.