St. Clair County sets no annual night cap on short-term rentals. No county ordinance limits the number of rental nights per year. The 30-day threshold only matters for hotel-tax purposes; caps, if any, come from a city ordinance.
The county does not cap how many nights per year a home may be rented short-term. There is no St. Clair County STR ordinance imposing a maximum number of booked nights, and Illinois has no statewide night cap. The only night-related line that matters at the county/state level is the 30-day distinction: stays under 30 days are taxable transient 'hotel' rentals, while 30-plus-day tenancies are treated as permanent residency and are exempt from hotel tax. Some Illinois municipalities cap STR nights (for example on non-owner-occupied properties); hosts inside a city should check that ordinance.
No county night-cap penalty exists. Where a city caps rental nights, exceeding the limit can void the STR permit and trigger municipal fines.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how O'Fallon's night caps rules stack up against other locations.
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