Iowa City does not impose a specific numeric cap on garage sales per year in its Zoning Code, but Title 14 limits garage sales to occasional accessory uses on residentially zoned property. Sales that recur frequently enough to function as ongoing retail can be cited as Title 14 zoning violations and may lose the Iowa state sales-tax isolated-sale exemption under Iowa Code Section 423.2. Sign rules apply to every sale: signs must remain on the seller's own property and are removed from public right-of-way by Iowa City Public Works.
Iowa City's garage-sale framework relies on the occasional/accessory-use limit in Title 14 (Zoning Code / Unified Development Code) at https://codelibrary.amlegal.com/codes/iowacityia/latest/iowacity_ia/0-0-0-1 rather than a hard numeric cap such as 'three sales per year.' Garage sales are a permitted accessory use on residentially zoned property when conducted occasionally; sales that operate weekly, monthly, or on an ongoing basis cross the line from accessory garage sale to retail use that is not allowed in residential districts. Iowa City Neighborhood and Development Services has discretion to cite recurring or commercial-volume sales as zoning violations and refer them for sales-tax review. At the state level, Iowa Code Section 423.2 (https://www.legis.iowa.gov/docs/code/423.pdf) and Iowa Administrative Code 701 Chapter 211 exempt occasional household sales from sales tax under the isolated/casual-sale rule but do not exempt frequent or commercial-volume sales — sellers who operate recurring sales typically lose the state sales-tax exemption and must register with the Iowa Department of Revenue. Title 14 sign rules apply to every sale within the year: signs must remain on the seller's own property and may not be posted on utility poles, traffic signals, light poles, planting strips, or other public right-of-way. Confirm an Iowa City address with the Johnson County Assessor before relying on the City rule; adjacent Coralville, North Liberty, and University Heights have separate regulations and University Heights in particular is a distinct municipal jurisdiction within Iowa City's footprint.
Operating recurring or commercial-volume garage sales in Iowa City is a Title 14 zoning violation enforceable by Iowa City Neighborhood and Development Services as a municipal infraction with fines plus cease-and-desist orders. Continuing to operate after a cease-and-desist can trigger daily continuing-violation penalties. The Iowa Department of Revenue can independently assess back sales tax and penalties for sellers who lose the isolated-sale exemption by operating frequently. Sign-placement violations under Title 14 carry separate fines plus sign removal by Iowa City Public Works.
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