Tax assessments rarely equate to market value, at least here in Maryland!
Agents like myself are generally willing to consult with you regarding market conditions and values; there is never any obligation. We are the local economists, and we often know what's going on "behind the scenes" - there is much more than meets the eye.
Due to current conditions, the "actives" need to be considered - not just solds. What has sold in the last 90 days? What failed to sell? An agent can explain this further.