| City of O'Fallon |
| Phone: 618-624-4500. Website: http://www.ofallon.org/ City information, links to all the city departments, organizations, Code Red Emergency Database, Hospital and School Links. |
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| County Offices |
| Website: http://www.countyoffice.org/ Website for county government offices. |
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| O'Fallon Chamber of Commerce |
| Phone: 618-632-3377 Website: http://www.ofallonchamber.com/ Links to most O'Fallon business, information on local events, links to local churches and schools. |