| FWFort Wayne Foundry- Columbia City Div. I | Columbia City | IN | Primary Metal Manufacturing331222 | — | ◐ LIKELY ACTIVE |
| SDSteel Dynamics Structural | Columbia City | IN | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| ESEssex Solutions USA LLC | Columbia City | IN | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| NLNovae LLC | Columbia City | IN | Machinery Manufacturing333924 | 20-99 | ◐ LIKELY ACTIVE |
| SDSteel Dynamics, Inc. - Structural and Rail | Columbia City | IN | Primary Metal Manufacturing331110 | 500+ | ◐ LIKELY ACTIVE |
| WEWarner Electric | Columbia City | IN | Machinery Manufacturing333612 | 100-499 | ◐ LIKELY ACTIVE |
| AMAdvanced Materials Development | Columbia City | IN | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| AFAlliance Feed | Columbia City | IN | Food Manufacturing311119 | 20-99 | ◐ LIKELY ACTIVE |
| DVDulcius Vineyards | Columbia City | IN | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| LCLear Corporation - Columbia City | Columbia City | IN | Transportation Equipment Manufacturing336360 | 500+ | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Columbia City Mill Services | Columbia City | IN | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| MEMc Equipment, LLC | Columbia City | IN | Transportation Equipment Manufacturing336211 | — | ◐ LIKELY ACTIVE |
| MDMedical Division | Columbia City | IN | Machinery Manufacturing333515 | 1-19 | ◐ LIKELY ACTIVE |
| P1Plant 1 | Columbia City | IN | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| PCPyrotek Columbia City | Columbia City | IN | Nonmetallic Mineral Product Manufacturing327999 | 20-99 | ◐ LIKELY ACTIVE |
| RCR & C Machining LLC | Columbia City | IN | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| SStafco | Columbia City | IN | Fabricated Metal Product Manufacturing332420 | 20-99 | ◐ LIKELY ACTIVE |