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General contractors in O Fallon, MO

23 general contractors listed in O Fallon, Missouri. 22 with a phone number and 18 with a website.

O Fallon accounts for 0.5% of the general contractors listed in Missouri.

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Quick answer

O Fallon, MO has 23 general contractors listed on USA Business Search. 22 list a phone number and 18 list a website. The most listings are in ZIP codes 63366, 63368, 63367.

Updated October 2026
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How to choose a contractor in O Fallon

  • Get two or three written bids with the same scope.
  • Ask for proof of liability insurance and workers' comp.
  • Tie payments to finished stages of the work, never all up front.

Check the business: confirm a company's registration with the state in our Missouri business lookup guide, and licensed trades in the contractor license lookup guide.

Common questions

How many general contractors are listed in O Fallon, Missouri?

USA Business Search shows 23 general contractors in O Fallon. 22 list a phone number and 18 list a website.

Which ZIP codes do these listings cover?

They include ZIP codes 63366, 63368, 63367.

How do I choose a contractor in O Fallon?

Get two or three written bids with the same scope. Ask for proof of liability insurance and workers' comp. Tie payments to finished stages of the work, never all up front. Check the license or registration through the Missouri business lookup guide.

How do I add or fix a listing?

Listings are free. Use Add your business, or the Claim or fix link on any listing.

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