2 county-level rules, plus city-specific rules for 1 city in Polk County, Iowa.
Verified from official government sources
Temporary political signs are allowed in unincorporated Polk County without a sign permit, but may not be erected earlier than 70 days before the election and must comply with Iowa Code 68A.406.
Polk County Zoning Ordinance, Art. 11, Div. 1, Sec. (Exceptions to Sign Permit)(7)
Political Signs. Temporary signs advertising political parties, candidates for election or issues on the ballot, may be erected or displayed and maintained provided they meet the requirements of State Code 68A.406 and are not erected or displayed earlier than seventy (70) days prior to the election to which they pertain.
The Zoning Ordinance has no garage-sale-sign-specific rule. Small temporary/portable signs are treated as portable signs (a temporary sign permit, 14-day validity, 32 sq ft max) and may not be placed in the public road right-of-way.
Polk County Zoning Ordinance, Art. 11, Div. 4, Sec. 6 (Temporary Signs)
Portable signs and signs for special events and promotions shall require a temporary sign permit issued by the Planning Administrator or a designee... A temporary permit for a portable sign shall be valid for fourteen (14) days... Portable signs shall not exceed thirty-two (32) square feet of area.
1 cities in Polk County have their own sign regulations rules. Each link goes to that city's dedicated page with code citations.
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