How is my real estate value determined?

Jefferson County, as with most counties in Missouri, primarily values real estate for tax purposes using mass appraisal methodology. This method first determines the current replacement cost of all improvements, less any depreciation of those improvements. The depreciated value of the improvements is added to the value of the land to determine the fair market value of the property. The mass appraisal method is recognized as being one of the most efficient and fair methods of valuing many properties over a wide area.

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1. My address has changed; how do I notify the Assessor?
2. How is my real estate value determined?
3. When is my property reassessed?
4. What is market value?
5. What is assessed value?
6. Why would my assessment or taxes increase?
7. Is there an appeal process if I don't agree with the assessment increase?
8. My property has been destroyed; what are my options?
9. Is there tax relief for senior or disabled citizens?