If you know a realtor who has MLS access and the home was in the MLS system, this is the first way I would check. 2nd would be tax assessor's records. However, as a realtor, I have found that the records on the assessor's website can be VERY wrong - so I don't take those numbers as gospel. And mind you, in some areas, unless you are the homeowner in question, you cannot check the info - it's private. The last option would be to check out the recorded deed. In some areas it may actually be downloadable as a pdf on the county website. In less high-tech areas, you would have to go to the county recorder's office (typically at the courthouse) and look there.. I wouldn't bother with sites like zillow.com and such. The numbers on there are usually very wrong - either too high or too low.