Do you ever wonder why or how your property value fluctuates? Are you bewildered by terms like: Maximum Assessed Value, Real Market Value, and Assessed Value? This video, created by the Oregon Association of County Tax Collector, might provide some clarity on Oregon's tax system. Watch and learn more. In Multnomah County, Oregon, the average Assessed Value for single-family homes in 2018 is 49-percent of Real Market Value depending on the property and area. Learn more about Multnomah County property taxes by visiting: multco.us/assessment-taxation