| ACAmerican Concrete Products INC | Denison | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Perry | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Winterset | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Audubon (historical) | — | ◇ UNVERIFIED |
Dumani Stone LLC | Evansdale | — | ◐ LIKELY ACTIVE |
| PVPleasant Valley Redi-mix, INC | Bettendorf | 20–99 | ◐ LIKELY ACTIVE |
| DRDyersville Ready-mix Plant | Dyersville | 100–499 | ◐ LIKELY ACTIVE |
| CIConcrete INC - Marshalltown | Marshalltown | 1–19 | ◇ UNVERIFIED |
| GCGreene County Redi-mix INC - Jefferson | Jefferson | 20–99 | ◇ UNVERIFIED |
| JCJas Construction, LLC | Altoona | 20–99 | ◇ UNVERIFIED |
| MRMoorhouse Ready Mix Inc-breda (port Plt) | Breda | 1–19 | ◇ UNVERIFIED |
| SRSpringville Ready Mix Company | Springville | 20–99 | ◇ UNVERIFIED |
| CPCalcium Products Inc-gilmore City | Gilmore City | — | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix | Des Moines | 20–99 | ◐ LIKELY ACTIVE |
| HMHarsco Metals | Muscatine | — | ◐ LIKELY ACTIVE |
| HRHawkeye Ready Mix Hiawatha | Hiawatha | 20–99 | ◐ LIKELY ACTIVE |
| KRKing's Ready Mix | Cedar Rapids | 20–99 | ◐ LIKELY ACTIVE |
| MSMicro Surface Finishing | Wilton | 20–99 | ◐ LIKELY ACTIVE |
| MCMidland Concrete Products Clear Lake | Clear Lake | 20–99 | ◐ LIKELY ACTIVE |
| WCWeyrick, Chris | Wapello | 1–19 | ◐ LIKELY ACTIVE |
| BWBurlington Wilbert Vault Works, INC. | Burlington | 1–19 | ◐ LIKELY ACTIVE |
| CGCardinal Glass | Greenfield | — | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix | Des Moines | — | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix | Boone | — | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix | West Des Moines | — | ◐ LIKELY ACTIVE |
| CMC.j. Moyna & Sons INC | Iowa | — | ◐ LIKELY ACTIVE |
| CCContinental Cement Company | Buffalo | — | ◐ LIKELY ACTIVE |
| EBEldridge Bag Plant | Eldridge | — | ◐ LIKELY ACTIVE |
| FCForterra Concrete Products - Des Moines | Des Moines | — | ◐ LIKELY ACTIVE |
| FCForterra Concrete Products - Humboldt | Humboldt | — | ◐ LIKELY ACTIVE |
| FCForterra Concrete Products - Iowa Falls | Iowa Falls | — | ◐ LIKELY ACTIVE |
| FPForterra Pipe & Precast - West Des Moines | West Des Moines | — | ◐ LIKELY ACTIVE |
| HCHancock Concrete Products | Lake View | — | ◐ LIKELY ACTIVE |
| HPHawkeye Pedershaab Concrete Technologies, INC | Mediapolis | — | ◐ LIKELY ACTIVE |
| HIHoffmann INC | Muscatine | — | ◐ LIKELY ACTIVE |
| HIHolcim (us) INC - Mason City | Mason City | — | ◐ LIKELY ACTIVE |
| IRIdeal Ready Mix CO INC - West Burlington | West Burlington | — | ◐ LIKELY ACTIVE |
| LRLiberty Ready Mix - Grimes | Grimes | — | ◐ LIKELY ACTIVE |
| LRLiberty Ready Mix - Van Meter Facility | Van Meter | — | ◐ LIKELY ACTIVE |
| MIManatts INC | Ankeny | — | ◐ LIKELY ACTIVE |
| MCMonarch Cement of Iowa INC | Des Moines | — | ◐ LIKELY ACTIVE |
| NRNorthwest Ready-mix | Ocheyedan | — | ◐ LIKELY ACTIVE |
| TVTcc - Vinton | Vinton | — | ◐ LIKELY ACTIVE |
| ACAmerican Concrete Products | Johnston | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Jefferson | — | ◇ UNVERIFIED |
| APAndrews Prestressed Concrete INC | Clear Lake | — | ◇ UNVERIFIED |
| AAArch Aluminum & Glass CO INC | Bettendorf | — | ◇ UNVERIFIED |
| ARA-tec Recycling INC | Des Moines | — | ◇ UNVERIFIED |
| BEBlended Equipment Solutions | Altoona | — | ◇ UNVERIFIED |
| CPCalcium Products INC | Fort Dodge | — | ◇ UNVERIFIED |