Do they live in your town/county? or across the country? I find when trying to do reverse lookups, and what not there is a multitude of resources, but you have to know what to look for.
If you know what county they live in (aside from yours), see if that country has an organized country government website, my county you can find property owners EASY. Ummm, if that doesn't work, there's also the library, well, if they live in your area, go to the public library, and there's a multitude of reverse lookup resources that come in extremely handy. And, no, I don't stalk people... not anymore
