St. Charles County, MissouriProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- November 2026; official county materials identify the November 2026 tax bill but do not publish a specific mailing day.
- Payment deadline
- December 31, 2026; the Collector's official guidance accepts December USPS postmark for timely mailed payment.
- Assessment appeal
- July 13, 2026 by 5:00 p.m.; St. Charles County Board of Equalization forms are due the second Monday in July.
Exemptions & appeals
Senior relief
St. Charles County Seniors Real Estate Property Tax Relief: applicants must be 62+ as of January 1, 2026, occupy and be liable for the primary residence; the 2026 application/renewal period ran March 1–July 6, 2026 after a county-approved extension. The credit limits future tax-bill increases but excludes state Blind Pension and bonded-indebtedness portions.
Valuation limits
No general local annual valuation cap was verified. Missouri real property is generally reassessed in odd-numbered years, with statutory assessment ratios of 19% residential, 12% agricultural, and 32% commercial; any local senior credit limits tax liability rather than market or assessed value.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →