County Assessor

County Assessor, Jake Zimmerman, photo.

The Saint Louis County Assessor's Office discovers, identifies, classifies and assesses all real and personal property within Saint Louis County. Functionally, the Office is comprised of:

  • Abstract (Title Recording)
  • Appraisal Support
  • Assessment Systems
  • Personal Property
  • Real Property

The County Assessor is required by Missouri State Statute 137.115 to establish the fair market value of all real property as of January 1 of every odd year (like 2011 and 2013). The assessed value is applied to the tax rates established by the taxing districts to determine the amount of tax levied against a property.

The reassessment process involves establishing the value of about 389,000 parcels of real property, providing owners the opportunity to appeal, then finalizing, certifying and communicating the values to the individual taxing districts.

Throughout the process, the staff of the Assessor’s Office makes every effort to treat our customers fairly and to provide information in a clear and accessible manner.

Jake Zimmerman

Holiday Hours
The Assessor’s Department will be closed on Monday, January 2nd for the New Year's holiday. Our office will reopen on Tuesday, January 3rd.
Personal Property Declarations
Personal Property Declarations have been mailed to registered St. Louis County businesses and individuals who own tangible personal property.  Declarations must be returned to the Assessor’s Department by March 1st, 2012 to avoid a statutory penalty.

Click on the following links to learn more about Business/Manufacturing Declarations, print a copy of the Business/Manufacturing Equipment Personal Property Declaration, or print a copy of the New Resident Personal Property Declaration.

Please contact our Personal Property Division, at 314-615-1500 or, if you have questions regarding your declaration.
Tornado Damage
St. Louis County property owners whose property sustained damage by the April 2011 tornado may request a review of their property to insure an accurate and fair value for 2011 reassessment purposes. The form to request such a review can be found hereAdobe PDF Document
To consider a value adjustment, the Assessor is requesting additional detailed information about the damage you incurred during the April 2011 tornado. Complete the questionnaire below for either residential or commercial property and return to the Assessor’s office.
Was your property severely damaged in the April 10 tornado?
Look Up Your Preliminary Assessed Value Now
Address: Saint Louis County Assessor
41 South Central Avenue
Clayton, MO 63105-1799

The Assessor's Office is located on the second and third floors of the Lawrence K. Roos County Government Building.
Phone Numbers:
Personal Property
(314) 615-1500
  Real Estate
(314) 615-2555

All Other Inquiries
(314) 615-5500
visit the Contact Us page.
Office Hours:   Monday - Friday
8:00 am to 5:00 pm