You can go to Zillow.com to see what has sold in the area surrounding a particular address. I would be careful relying on the accuracy of the "Zestimate" This is based on assessment and compared to properties that have sold and does not take in consideration of the quality or esthetics of a property.
Otherwise I would go with the County Assessorâ€™s office is a great place to start.
http://www.whatcomcounty.us/assessor/index.jsp site as stated before.
Good luck...... more