Our in-person services have now reopened, on the street-level of the County Administration Building in Clayton. We will be available to serve you in-person Monday-Friday, 8:00am - 5:00pm.

For Business personal property, please call 314-615-5104 to determine if an in-person visit is required.

Our on-line, email and telephone services are also available for your convenience. You can access most requested information and services from the Assessor's Office by following the links below:

Assessor's Office Telephone: (314) 615-5124

Assessor's Office Email:

Business Personal Property: [email protected]

Business Personal Property Telephone: 314-615-5104

2020 Personal Property Declarations: A late filing fee will be applied to all accounts if the 2020 Declaration is filed after August 15, 2020. You can verify receipt by visiting the Personal Property information page.

2020 Board of Equalization Appeals: Please contact the Board at [email protected] or at (314) 615-7195.

Many answers to Assessment related questions can be found here.

We look forward to serving you!

County Assessor's Office


County Assessor Jake Zimmerman
The St. Louis County Assessor’s Office is responsible for accurately classifying and valuing all property in a uniform manner. We are committed to treating every property owner fairly, and to providing clear, accurate and timely information.


The Assessor, together with his team of professional appraisers, analysts, and managers, is required by Missouri law to calculate the market value of real property and business personal property. County-wide reassessments take place every two years (in odd numbered years). While property values listed on the assessment rolls are used to calculate annual property taxes, the Assessor does not set tax rates, calculate the amount of your taxes, or collect taxes.

The Assessor is also responsible for:

  • Maintaining current property ownership information for personal property (including vehicles and equipment) and for real estate;
  • Updating property characteristics (for real estate, both land and improvements); and
  • Analyzing real estate trends (such as rents, sale prices, and construction costs).


Our staff will be happy to assist you at our Office or by phone:



41 South Central Avenue, 3rd Floor
Clayton, MO 63105-1799
(314) 615-4981
8:30 a.m. - 4:30 p.m. (Monday - Friday)

We look forward to serving you.

Jake Zimmerman
County Assessor