Wow, thank you to everyone who responded. This is hugely helpful. I've been using direct mail market campaigns for land, but it makes sense that houses requires a lot more detail when looking where to send mail.
Reading through the above comments, I think I'm going to start applying some of the filters you guys talked to include absentee owners, owned house for x amount of years, and also have over x amount of equity in the house itself and then search at the zip code level first and see if I need to narrow or widen my search from there.
What do you guys recommend widening or narrowing first? location or criteria? For example should I go to zip-code to city or like years owning a house from 20 years to 10 years. I'll also probably start with just single family houses and then probably experiment with other types later.
I've never tried listsource, but I can definitely give them a look. I'm currently getting my lists through prycd.com, which uses DataTree as their source for real cheap, but they currently only specialize in land, so I'll be in need of a list source for houses in the meantime until they have that implemented.
I appreciate all of the responses again!
Justin W