| Company | Product | Employees | Seasonal Employees | Union |
| Tyson Fresh Meats Website |
Beef slaughter & processing | 5,256 | 0 |
UFCW |
| City Schools Website |
Education | 474 | 0 | NSEA |
| Great West Casualty Co./ Joe Morton & Son, Inc. Website |
Insurance | 393 | 0 | None |
| BPI, Inc. Website |
Beef processing | 199 | 0 | UFCW |
| Sara Lee Bakery Group Website |
Bakery products | 135 | 0 | BCW |
| Marina Inn Website |
Motel/restaurant | 150 | None | |
| Gerkin Windows & Doors Website |
Windows & doors | 135 | 0 | None |
| Phillips Kiln Website |
Repair kiln | 113 | 40 | None |
| Sioux City Foundry, Inc. Website |
Ductile gray iron foundry | 108 | 6 | None |
| City of South Sioux City Website |
Government | 87 | 60 | AFSCME |
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