On Thursday, February 21, City of Fairfax government offices will open on time. Liberal leave is in effect for city employees.

To report weather-related issues, including road conditions or downed limbs in the public right-of-way, call Police Dispatch at 703-385-7924.


  • For information on Parks and Recreation classes and activities, click here:
  • For information about Fairfax Museum and Visitor Center hours, please call 703-385-8414.
  • For information about Historic Blenheim hour, call 703-591-0560.

In case of emergency, call 911.

Click here for more winter weather-related information

Assessment Sales Ratio

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The chart below summarizes the results of the 2016 real estate assessment/sales ratio study conducted by the Virginia Department of Taxation, for jurisdictions in the Northern Virginia area. The study estimates the existing assessment/sales ratio (ASR) for each locality by comparing assessed values to the selling prices of bona fide sales of real property.

The study also evaluates the level of uniformity in the assessment of real property within and among jurisdictions throughout the Commonwealth as reflected by a standard statistical measure known as the coefficient of dispersion (COD).

The coefficient of dispersion measures how closely the individual ratios are arrayed around the median ratio. The smaller the measure of dispersion, the greater the uniformity of the ratios. The more closely the ratios are grouped around the median, the more equitable was the property assessment, since properties were assessed at similar rates. As market activity decreases or as the complexity of properties increases, the coefficient of dispersion often rises, even though appraisal procedures may be valid. According to the International Association of Assessing Officers “…a coefficient of 10% or less indicates a good distribution of assessments for residential properties. Similarly, a coefficient of 15% or less indicates a good distribution for more diverse classes (of property)…”

This study serves as a component in the basic school aid distribution formula and as an element in the determination of assessment levels of Public Service Corporation property.

The overall median assessment/sales ratios and coefficients taken from the 2016 assessment/sales ratio study for the City of Fairfax and surrounding jurisdictions are as follows:

City of Fairfax
City of Falls Church
City of Manassas 



City of Alexandria

Loudoun County
Arlington County
Fairfax County


Prince Wm. County 











*Source: Median Assessment/Sales Ratios for Virginia Localities, published May 2018, Virginia Dept. of Taxation.

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