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This varies depending on where the property is located. The smallest parcels may be 20,000 square feet (just shy of 1/2 acre). If you are looking at a property that is in the extreme outlying areas, Rock Island County may require a minimum of 40 acres for a building site. Your best bet is to email Greg Thorpe.
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The Rock Island County Zoning and Building Office is located at 1504 Third Avenue, Room 305, Rock Island IL, 61201. Office hours are 8 to 10 am and 3 to 4:30 pm, Monday through Friday excluding holidays. From 10 am to 3 pm, inspectors are in the field.
The Zoning Investigator's normal office hours are between 8 to 10 am and 3 to 4:30 pm. Questions and permits may be handled all day, but specific requests for these persons should be made during the hours shown, otherwise, inspectors are in the field daily
See the Codes section on the Building Safety page.