Platte County Assessor's Office

Real Property

The Assessor is responsible for assessing the county’s real property and supplying parcel based land information and mapping to both land professionals and the general public. Real property is reassessed every two years and is calculated as a percentage of market value.

Real Property % of Market Value
Residential 19%
Commercial 32%
Agricultural 12%

Real property includes land, improvements to the land (e.g., house, garage) and all rights inherent in ownership.

Quickly and easily access geographic and property record information for individual parcels of property in Platte County. The maps and data are for illustration purposes and may not be suitable for site-specific decision making.

Property Search 

What is Real Property?

Real property includes land, improvements to the land and all rights inherent in ownership. When you receive an assessment notice or tax bill for your house, you will notice that land and improvements are listed separately. Improvements consist of any buildings located on that land (e.g. your house). This has nothing to do with improvements (e.g. rehabilitation, renovation or repairs) you have or have not made to your property.

What is Assessment and Reassessment?

Assessment is the process of placing a value on property for the purpose of property taxation. Real property is reassessed every odd year to ensure that the taxpayer is being taxed fairly, and is taxed the same as other comparable property.

When and how is real estate valued?

Missouri Revised Statute 137.115 requires that the Assessor reassess all real property every two years on January 1, in the odd numbered year. Real property is assessed into three categories with separate rates and is calculated as a percentage of market value. Assessed values are carried forward to the even numbered years except for new construction and property improvements.

Real Property % of Market Value
Residential 19%
Commercial 32%
Agricultural 12%

As an example, a residence with a market value of $50,000 would be assessed at 19% which would place its assessed value at $9,500.

What is market value?

Market value is the price a willing buyer will pay a willing seller for property in its present condition. This process is continual due to ever-changing market conditions.

Will property values change due to reassessment?

All values are likely to change, but not all will change to the same extent. Market values increase more in some neighborhoods than in others. A major purpose of reassessment is to make sure that the new values reflect all changes that have occurred.

If no improvements have been made to my property, why should the assessed value increase?

Over time market value often changes even if no improvements are made to the property. Many people sell their homes for much more than they paid for them years earlier with no more than basic maintenance on the property. Missouri Statutes require that property be periodically reassessed to maintain realistic market values and treat all taxpayers fairly.

Will I be notified of an increase in my assessment?

If the Assessor proposes to increase the assessment of real property, the assessor shall, on or before the fifteenth day of June, provide a notice of the projected increase to the person owning the affected property. The notice will be sent by US Postal Service mail to the last known address of the property owner.

How does reassessment affect my taxes?

The assessed value of your property is used to determine your portion of real estate taxes paid to support local school and government services. It is important to you and to our office that your assessed valuation is accurate.

The amount of real estate taxes paid in Platte County is determined by tax levies set by local taxing authorities such as school, fire, library, hospital, and road districts, along with city and county taxing authorities. This is why it is important to be aware of any proposed changes in spending by your local schools or governments.

What is a tax levy?

A tax levy is a number determined by a taxing authority such as a school district used in calculating, from the assessed value, the amount owed to that taxing authority for that tax year. As government services and costs increase, levies and taxes have to be raised to pay for these services.

Does the Assessor's Office set the levy rates?

No, the assessor only values property.

What if I disagree with the assessed value on my property?

If you disagree with your property's valuation during any tax year, you may appeal by following these steps:

1. Informal Hearings: call or meet with an Appraiser prior to June 1. Please be prepared with documentation as evidence of the value you believe to be accurate, including information such as pictures, a recent sale of your property, or an appraisal of your property.

2. Board of Equalization: if you disagree with the Appraiser, you can appeal to the Platte County Board of Equalization (BOE). Appeal forms are available at the Assessor's Office and must be completed and returned to the Assessor's Office BEFORE the third Monday in June. The BOE will hear your evidence of property value during a scheduled hearing in July.

3. State Tax Commission: You have the right to appeal to the State Tax Commission by September 30 or within 30 days after the Board of Equalization makes a final decision on your appeal, whichever date is later.

When will I get my real property tax bill?

The Platte County Collector mails tax bills each November. Real estate property tax must be paid by December 31 to avoid late payment fees. If you have questions about your property tax bill, please contact the Platte County Collector's Office at (816) 858-3356.

Can I get a copy of county maps or map GIS data?

Current tax year Maps and ArcGIS data of Platte County can be purchased through the Assessor's office in Platte City, or accessed online through the GIS Portal.