| JDJohn Deere Dubuque Works Proving Grounds | Dubuque | — | ◇ UNVERIFIED |
| JDJohn Deere Foundry | Waterloo | — | ◇ UNVERIFIED |
| JDJohn Deere Waterloo Operations | Waterloo | — | ◇ UNVERIFIED |
| KWKCB Welding & Manufacturing, LLC | Iowa Falls | — | ◇ UNVERIFIED |
| KGKirchners Garage | Donnellson | — | ◇ UNVERIFIED |
| MEMcAfee Enterprises Inc | Hiawatha | — | ◇ UNVERIFIED |
| MMMeridian Manufacturing Group, INC. | Storm Lake | — | ◇ UNVERIFIED |
| MAMid America Trenchers LLC | Dexter | — | ◇ UNVERIFIED |
| MCMi-t-m Corporation | Peosta | — | ◇ UNVERIFIED |
| MCMm Composite INC | Mount Pleasant | — | ◇ UNVERIFIED |
| MMMs Machining Systems INC. | Shell Rock | — | ◇ UNVERIFIED |
| OMOptical Mechanics, Inc. | Iowa City | — | ◇ UNVERIFIED |
| PPPrecision Pulley and Idler INC. | Corning | — | ◇ UNVERIFIED |
| PPPrecision Pulley & Idler - Corning (division #2) | Corning | — | ◇ UNVERIFIED |
| PPPrecision Pulley & Idler - Lenox | Lenox | — | ◇ UNVERIFIED |
| RSRadius Steel Fabrication | Sioux City | — | ◇ UNVERIFIED |
| RMReliable Machine & Manufacturing CO INC | Hiawatha | — | ◇ UNVERIFIED |
| SBSar Biomass Energy Systems | Pocahontas | — | ◇ UNVERIFIED |
| SIScherrmans Implement | Dyersville | — | ◇ UNVERIFIED |
| SCSchumacher Company, Lc. | Stockton | — | ◇ UNVERIFIED |
| SISeaberg Industries, INC. | Davenport | — | ◇ UNVERIFIED |
| SMShaver Manufacturing CO INC | Graettinger | — | ◇ UNVERIFIED |
| SESiemens Energy, INC. | Fort Madison | — | ◇ UNVERIFIED |
| SESiemens Energy, INC. | Otho | — | ◇ UNVERIFIED |
| SGSiemens Gamesa Renewable Energy INC | Fort Madison | — | ◇ UNVERIFIED |
| SGSiemens Gamesa Renewable Energy, INC. | Massena | — | ◇ UNVERIFIED |
| SMSukup Manufacturing CO Clear Lake | Clear Lake | — | ◇ UNVERIFIED |
| TMTobroco Machinery LLC | City of Des Moines | — | ◇ UNVERIFIED |
| TDTonka Division of Shannon Group | Mason City | — | ◇ UNVERIFIED |
| UDUltra-cool Dba Borgen Systems | Des Moines | — | ◇ UNVERIFIED |
| VKVan Ko Chopping LLC | Reasnor (historical) | — | ◇ UNVERIFIED |
| VCVarsity Cleaners | Waterloo | — | ◇ UNVERIFIED |
| VSVer Steegh Manufacturing LLC | Oskaloosa | — | ◇ UNVERIFIED |
| VMVH Mfg, Inc. | Rock Valley | — | ◇ UNVERIFIED |
| WMWetherell Manufacturing CO. | Cleghorn | — | ◇ UNVERIFIED |
| WIWindridge Implements L.l.c. | Decorah | — | ◇ UNVERIFIED |
| WGWittern Group Corporation | Clive | — | ◇ UNVERIFIED |
