This packet provides guidelines for the preliminary design and platting of subdivisions within 1.5 miles of the City of O'Fallon. If rezoning is done through the City, a subdivision must simultaneously proceed through the Planned Use Process. Both must receive approval through City Council. A link of the Subdivision Development Control Ordinance is available here
These are "pdf" type files. You will need Adobe Acrobat Reader to open these files (available for free from www.adobe.com)