I'm not aware of any service that provides a mailing list for owners. I always use the tax records for the locale I am targeting. Typically you can pull up a list of properties on a given street or in a particular zoning code. The owner name is usually shown on the tax records, but in some cases the tenant pays the taxes and may actually show up as the owner on the tax records. Not a failsafe method, but I don't know of any other source.
Dec 23, 2008