Polk County, IA Sign Regulations: Digital Billboards (2026)
Key Facts
- Digital billboards
- Allowed, subject to Iowa DOT Ch. 117
- On-site electronic signs
- Government/school property only
- Movement rule
- No scrolling, flashing or undulating text
- Underlying billboard limits
- 50 ft height, 1,000 ft spacing still apply
- Permit
- Sign Permit required, Art. 11 Div. 1
Summary
Polk County allows LED electronic displays on off-site billboards, but only under the standards of Iowa Administrative Code Chapter 117 Outdoor Advertising. On-site electronic message signs, by contrast, are limited to government and school property.
Section 4. Electronic Message Signs (A) Electronic Message signs shall only be allowed on site for use by governmental entities including federal, state, county, city and school owned property, as well as indoor institutional uses... (1) The sign and/or sign text shall not scroll, flash, undulate or otherwise move in any manner... (D) Off-site signs (Billboards) shall be permitted light-emitting diode (LED) displays as permitted by Iowa Administrative Code, Transportation Department [761], Chapter 117 Outdoor Advertising.
Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.
Full Breakdown
Article 11, Division 4, Section 4 of the Polk County Zoning Ordinance addresses electronic message signs, and it treats billboard-mounted LED displays differently from every other electronic sign in the county. Subsection (D) states that off-site signs, meaning billboards, shall be permitted light-emitting diode displays as permitted by the Iowa Administrative Code, Transportation Department [761], Chapter 117 Outdoor Advertising. That state chapter, not a separate county numeric standard, is what actually governs brightness, dwell time and other technical limits for a digital billboard face in the unincorporated county.
The rest of Section 4 shows how narrow the county's own electronic-sign allowance otherwise is: subsection (A) restricts electronic message signs generally to on-site use by governmental entities (federal, state, county, city, school) and indoor institutional uses, bars scrolling, flashing or undulating text, and limits content to the entity's own activities or services. Subsections (B) and (C) carve out narrow exceptions for time-and-temperature or fuel-price displays and a two-square-foot 'OPEN' sign for a business. A digital billboard still has to satisfy every Division 4, Section 2 off-site sign standard: the 50-foot height cap, the 100-foot residential/institutional setback, 1,000-foot spacing from other billboards, and the 300 or 975 square-foot area cap depending on the district, plus a Sign Permit under Article 11, Division 1.
Violations & Fines
A digital billboard installed without meeting Iowa DOT Chapter 117 standards, or one that exceeds the underlying off-site sign height, setback, spacing or area limits, is treated as an unlawful sign use under Article 23. The Zoning Administrator can issue a Notice of Violation, escalate to a citation if uncorrected, and pursue civil penalties assessed per day the noncompliant display remains in place.
Frequently Asked Questions
Are digital billboards legal in unincorporated Polk County?
Can a business put up a scrolling LED sign on its own property?
Do digital billboards still have to meet the regular billboard rules?
Sources & Official References
Other rules in Polk County
Compare Polk County to another location·View the Iowa sign regulations overview
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