Marin County, CA Sign Regulations: Digital Billboards (2026)
Key Facts
- Billboards
- Prohibited outright, § 22.28.030(B)(2)
- Digital displays
- Prohibited if they can distract drivers
- Electronic message center signs
- One per property maximum
- Message hold time
- Minimum 4 seconds per change
- Night brightness limit
- 0.3 foot-candle difference, on vs off
- Penalty
- Up to $500 fine or 6 months jail
Summary
Unincorporated Marin County outlaws billboards and driver-distracting digital displays entirely under its Development Code sign standards. Marin County Code of Ordinances § 22.28.030(B) lists digital displays that can distract drivers and billboards among six prohibited sign categories countywide. A separate, far more limited sign type, the electronic message center sign, is allowed but capped at one per property with strict brightness and timing rules.
B.Prohibited signs. The following signs are prohibited:1.Digital displays that can distract drivers;2.Billboards;3.Signs advertising a use no longer in operation;4.Feather signs;5.Signs in storage or in the process of assemblage or repair, that are located outside of a premises other than that advertised on the sign, and are visible from a public right-of-way; and6.Stuffed or inflated animals or characters used as signs.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 2026 Update 1).
Full Breakdown
Marin County's Development Code sign chapter, adopted by Ord. No. 3666 in 2017 and amended by Ord. No. 3706 in 2019, flatly prohibits billboards anywhere in the unincorporated county. Section 22.28.030(B) lists six banned sign types, and 'billboards' sit at number two, right after 'digital displays that can distract drivers' at number one. Because a digital billboard is both a digital display and a billboard, it is doubly barred: no permit, variance, or design review can authorize one. The ban covers freeway-facing structures, off-site advertising panels, and any illuminated changeable-copy board erected primarily for outdoor advertising.
The Development Code does allow a narrower, on-premise alternative: the electronic message center sign, permitted under Section 22.28.030(H)(5) at a maximum of one per property. These signs may not flash, blink, flutter, chase, or display video, and each message must hold for at least four seconds before changing. Night-time brightness is capped so the difference between the sign powered off and displaying a solid white image cannot exceed 0.3 foot-candles measured perpendicular to the sign face, and the sign must carry a photocell or equivalent sensor that dims it automatically as ambient light drops.
Building an unpermitted digital billboard or off-site advertising sign triggers code enforcement by the Marin County Community Development Agency, which can order removal. Because the sign chapter sets no separate penalty schedule, a violation falls back to the countywide misdemeanor penalty in Marin County Code § 1.04.270: a fine of up to $500, imprisonment of up to six months, or both.
Violations & Fines
Erecting a billboard or a driver-distracting digital display anywhere in unincorporated Marin violates § 22.28.030(B) regardless of zoning district, size, or duration. The Community Development Agency can issue a stop-work or abatement order requiring removal at the owner's expense. Because Chapter 22.28 sets no separate fine schedule, prosecution proceeds under the countywide misdemeanor penalty, Marin County Code § 1.04.270: up to a $500 fine, six months in county jail, or both.
Frequently Asked Questions
Can I put up a digital billboard on my property in unincorporated Marin County?
What is the difference between a banned billboard and an allowed electronic message center sign?
What happens if someone installs an illegal digital billboard in unincorporated Marin County?
Sources & Official References
Other rules in Marin County
California rules heatmap·Compare Marin County to another location·View the California sign regulations overview
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