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We figured out the best companies to work for in OFallon, IL, using data on salaries, company financial health, and employee diversity. You can also search for the best companies to work for in Illinois or any other state or city.

Zippia score 3.6
Zippia score 3.6
Zippia score 3.4
In the Metropolitan St. Louis area, O'Fallon is known as one of the fastest growing communities and it has earned a reputation as a great place to visit and an even greater place to call home. Located just twenty minutes from anywhere, O'Fallon is the...
Zippia score 4.6
Donate plasma with CSL Plasma and get rewarded!. Find out how you can make up to $1,000 in your first month with a visit to one of our plasma donation centers.
Zippia score 4.2
CARD is a provider of autism behavioral health services for children and adults affected by autism spectrum disorder. CARD treats individuals of all ages who are diagnosed with autism spectrum disorder (ASD) at treatment centers around the globe. CARD was founded in 1990 by leading autism expert, licensed psychologist, and behavior analyst Doreen Granpeesheh, PhD, BCBA-D. CARD treats individuals with ASD using the principles of applied behavior analysis (ABA), which is empirically proven to be the most effective method for treating individuals with ASD and recommended by the American Academy of Pediatrics and the US Surgeon General.
| Rank | Company | Zippia score |
|---|---|---|
| 1 | Metova Cybercents | |
| 2 | Phoenix Funding | |
| 3 | City of O'Fallon |
You can learn how the Zippia score and company rankings are calculated here.