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100 North Main Street
O'Fallon, MO 63366
Phone: 636-379-5532
Email: [email protected]

©2018-2021 City of O'Fallon, Missouri
 

Largest Employers

The most populous city in St. Charles County, O'Fallon is also home to some of the area's largest employers. Listed below are the 25 largest private sector employers in O'Fallon, Missouri.
BusinessProduct or ServiceEmployees
1MastercardGlobal technology headquarters3450
2True ManufacturingFreezers and commercial coolers manufacturerN/A
3CitiFinancial services1858
4CarShield (NRRM)Marketing & sales of service contracts650
5SAK ConstructionPipe rehabilitation and tunneling contractor502
6Progress West HospitalMedical services424
7MEMCSilicon wafer manufacturer345
8AldiWarehouse and distribution278
9Cosmos CorporationPet care products manufacturer270
10Allianz Global Corporate & SpecialtyCorporate and specialty insurance company250
11Air Evac LifeteamCorporate headquarters for medical air transportation246
12Bausch+Lomb SynergeticsSurgical instruments and supplies200
13Nortek Global HVACHeating and cooling components190
14O'Fallon CastingNon-ferrous investment casting foundry184
15Dynaflex (Ortho Solutions)Dental, orthodontic160
16VSM AbrasivesSandpaper manufacturer154
17The Phoenix GroupPOS equipment technology150
18River City DrywallResidential/Commercial-Drywall Installation, Taping, Painting130
19Mid America PeterbiltPeterbilt heavy duty truck dealership112
20McKesson CorporationPharmaceutical wholesaler111
21Schneider ElectricComputer hardware and software103
22Boeing Distribution ServicesAerospace fasteners supplier97
23Drug PackageDrug labels, forms, bags & product manufacturer87
24Phoenix Textile CorporationDistributor of textiles, linens, draperies, furniture85

Source:  City of O’Fallon Economic Development Department, 2023

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True Manufacturing HQ

Headquarters & Operations

Headquarters & Operations

International firm building in O'Fallon

International Firms

International Firms

O'Fallon Casting machinist

Manufacturing Firms

Manufacturing Firms