Sign Regulations in St. Charles County, MO (2026)
5 rules for unincorporated St. Charles County, Missouri.
Verified from official government sources
Political Signs
Political yard signs in unincorporated St. Charles County need no permit but are capped by size. Code § 405.480(C)(6) limits each sign to four square feet, with total political-sign area on a lot held to sixteen square feet in single-family residential districts and thirty-two square feet everywhere else, enforced by the Division of Planning and Zoning under the Unified Development Ordinance.
St. Charles County Political Sign Size Caps
Some RestrictionsSt. Charles County Code § 405.480(C)(6)
6. Political signs not to exceed four (4) square feet per sign and a total sign area of sixteen (16) square feet in single-family residential districts and thirty-two (32) square feet in districts other than single-family residential.
Garage Sale Signs
St. Charles County limits garage sale signs to one 4-square-foot sign per residence, posted no more than a day early and removed within 24 hours after the sale ends.
St. Charles County Garage Sale Sign Rules
Some RestrictionsSection 405.480(C)(3)
On-premise signs advertising general sales of personal property operated by private individuals: a. No sign shall be exhibited for more than one (1) day prior to the day such sale is to commence. Signs must be removed within twenty-four (24) hours of the close of such sale. The person(s) responsible for conducting such sale shall be responsible for removing such signs. b. One (1) sign not more ...
Holiday Displays
St. Charles County's exterior lighting standards regulate glare and light spillover from residential and commercial properties, but temporary outdoor lighting used during customary holiday seasons is fully exempt from those requirements.
St. Charles County Exempts Holiday Lights From Lighting Code
Few RestrictionsSection 405.421(B)(1)
The requirements of this Section apply to all private exterior lighting in conjunction with any institutional development, commercial development, industrial development or a residential development with a parking area for five (5) or more vehicles... However, this Section shall not apply to: 1. The use of temporary outdoor lighting used during customary holiday seasons; and 2. The use of tempo...
Digital Billboards
Electronic off-premise billboards are legal only on designated highways and must hold static images for at least 10 seconds with no motion or flashing.
St. Charles County Digital Billboard Rules
Significant RestrictionsSt. Charles County Code § 405.475(B)(11)
Electronic display techniques are permitted as off-premise signs when meeting criteria found herein... The full off-premise sign image or any portion thereof must have a minimum duration of ten (10) seconds and must be a static display. No portion of the image may flash, scroll, twirl, change color or in any matter imitate movement... The sign must not exceed a maximum illumination of 5,000 nit...
Window Signs
St. Charles County caps on-premise window, sidewalk and business sale signs and banners at 32 square feet in Commercial and Industrial Districts, and limits businesses to two temporary runs a year, no more than 15 days each. A sign permit from the Division of Planning and Zoning is required first, and the sign must come down the same business day the sale ends.
St. Charles County Window & Temporary Sale Sign Rule
Some RestrictionsSt. Charles County Code § 405.475(A)(2)(h)(1)
h. Temporary signs are permitted. (The sign can either be an on-premise ground sign or attached to a structure.) (1) On-premise window, sidewalk, and business sale signs or banners not exceeding thirty-two (32) square feet. Maximum usage—two (2) per calendar year for no more than fifteen (15) days per time. Such signs or banners must be removed after the close of the business day in which the s...
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