Due to the subjective nature of tax assessments in Northern VA, we use these purely as a just one of our market valuation tools because if you neighborhood suffered from many distress sales, we have seen the assessed values are more negatively affected than others within the Great Falls zip code.
According to our MLS statistics, average sold prices in Great Falls has actually increased by 8.8% from sales reported in the month of October 2010 in comparison to sales reported in 2011. Please refer to this report:
And more more information you can visit the website referenced below.
I hope this information is beneficial.