There are lots of places to look.
IT really depends on what information you are looking for and how accurate it needs to be.
Then knowing what resources you have access to is also important.
The most common source is the county property appraisers data base. Make certain you read the disclaimer that defines what the numbers REALLY mean. That number following JUST MARKET VALUE may be mean what you expect.
Attorneys and real estate professionals pay for access to other resources that will prove useful in gathering reliable and accurate data.
You would be well advised to understand, neighbors and aggregate websites are not the most reliable resources.
Best of success to you,
Annette Lawrence, Broker/Associate
Remax Realtec Group, Palm Harbor, Fl