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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 headquarters3811
2CitiFinancial services2400
3True ManufacturingFreezers and commercial coolers manufacturerN/A
4SAK ConstructionPipe rehabilitation and tunneling contractor502
5Progress West HospitalMedical services424
6MEMCSilicon wafer manufacturer354
7AldiWarehouse and distribution314
8CarShield (NRRM)Marketing & sales of service contracts300
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
14River City DrywallResidential/Commercial-Drywall Installation, Taping, Painting175
15O'Fallon CastingNon-ferrous investment casting foundry170
16DyanflexDental, orthodontic160
17The Phoenix GroupPOS equipment technology150
18VSM AbrasivesSandpaper manufacturer147
19True Fitness TechnologyFitness equipment manufacturer and distributor126
20Mid America PeterbiltPeterbilt heavy duty truck dealership112
21McKesson CorporationPharmaceutical wholesaler111
22Schneider ElectricComputer hardware and software103
23Boeing Distribution ServicesAerospace fasteners supplier97
24Drug PackageDrug labels, forms, bags & product manufacturer87
25Phoenix Textile CorporationDistributor of textiles, linens, draperies, furniture85

Source:  City of O’Fallon Economic Development Department, 2022

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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