Finding owner contact

[Caleb Jordan]

I've started looking for vacant houses in my city in Tarrant county texas. I've found a home that is clearly vacant. I found the owners, (two people with same last name) address on the county website, But the address listed is the vacant property, so it seems pointless to mail a letter to a house with nobody in it. 

I can't find any  phone numbers or anything either. What would some recommended next steps be?