Devereux and Company
“I won't do my taxes without him.”
Best CPAs near O'Fallon, MO
These firms serve O'Fallon from nearby bases in towns including Chesterfield, St. Peters and St. Charles.
13 firms listed · 2 open weekends · 10 rated 4.5+
Data verified October 16, 2026
Botz, Deal and Company
Alexander & Assoc Cpa's
“I feel fortunate to have found them to handle all my professional and personal tax needs.”
Varney & Associates
“I have tried many different accounting firms but this one is the best and I will never go anywhere else!!”
K&R Certified Public Accountants
“He took the time to get to know my business practices, always has insightful advice, and he helped me understand the tax liability side of running a business.”
Mila Samsonov CPA
“She gets things done in a timely professional manner 😊 …”
The 13 firms listed for O'Fallon, MO are accounting practices that serve businesses and organizations. What each states about its CPA license and assurance work comes from its own website; ratings and quotes come from public reviews.
Area overview: O'Fallon, MO
12 of the 13 firms on this page have a rating, from 4.0 to 5.0 across 37 reviews; 10 are rated 4.5 or higher. 2 are open on Saturdays. 3 have a BBB rating of A or A+. 11 have ten or more years of experience, the longest 43 years. 3 offer a free initial consultation and 1 is family- or locally-owned. We have a website on file for all 13 of the firms on this page; all 13 publish a contact page; 8 list a public email and 1 takes bookings online. We count these figures across the firms on this page; hours and prices change, so confirm the details with the firm before you book a consultation.
Which CPA firms listed for O'Fallon list their assurance services?
Website details are held for all 13 firms on this page. Most name the engagement types they perform and the industries they serve, which is the quickest way to see whether audit work is core business or an occasional job for them.
Rackers & Fernandez
“Very communicative and responsive to every question, no matter how ridiculous it may be.”
Parr & Jones Cpas
“His Quick Books lessons have been extremely helpful, his knowledge of business and personal taxes and accounting are outstanding.”
Bolk Tax Service CPA
“I had an appointment with Kyle and he filed my taxes very quickly and was extremely professional!”
Prosper Cpas
“They are extremely knowledgeable about nonprofit accounting, are fast, efficient and reliable.”
Fitzgerald & Fitzgerald
Tax Education
The Small Business Accounting Center
“Scott at The Small Business Accounting Center is an awesome help to us and our small business taxes and payroll.”
Why these companies made our list
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