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The update dates for the map is on the disclaimer page. But in general, the mapping data is updated once a month and the assessment data, as identified through the map, is updated weekly
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Guests can freely access the map and a limited amount of parcel data. For example, subscribers may search and view owner name but guests cannot. View the Comparison document (PDF) for a summary of differences.
Try retyping the password, especially if your browser is set to remember it. Try clearing the browser cache and log in again. Call the GIS department at 309-937-3404, the Assessment Office at 309-937-3570 or email.
The document may have been recorded during a time when property line changes are on hold until finalization of taxes. Property line changes recorded after September are reflected in the following year.
If there is a question about the boundaries of a parcel contact the GIS Office at 309-937-3404. If there is a question about the assessment information or you need to make a change of address contact the Assessment Office at 309-937-3570.