County Assessor

County Assessor Jake Zimmerman

The Saint Louis County Assessor's Office classifies and assesses all real and personal property within St. Louis County. The Office is comprised of:

  • Title Recording
  • Appraisals
  • Assessments
  • Personal Property
  • Real Property


The Assessor is required by Missouri law to establish the fair market value of all parcels of real property in St. Louis County as of January 1 of each odd-numbered year.

According to Missouri law, the deadline for filing an appeal of your assessed value was the second Monday in July — this year July 8, 2019 (Section 137.275, Revised Statutes of Missouri).

The Board of Equalization is responsible for assessment appeals. If you filed an appeal and did not waive your right to appear at the hearing, the Board of Equalization will send you a Notice of the location, date and time of your hearing. You can find more information at:

or by calling the Board of Equalization at 314 615-1795.

We are committed to treating every property owner fairly, and to providing clear, accurate and timely information.

Jake Zimmerman
County Assessor

Office Information - Assessor

Address: St. Louis County Assessor 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

Email: Contact Us
Office Hours: 8:00 a.m. - 5:00 p.m.