| AMArch Mirror North | Bettendorf | — | ◇ UNVERIFIED |
| BPBes Plant #1 | Altoona | — | ◇ UNVERIFIED |
| BSBuilders Sand and Cement CO. INC. | Davenport | — | ◇ UNVERIFIED |
| BWBurlington Wilbert Vault Works, INC. | Burlington | — | ◇ UNVERIFIED |
| CFCentral Flyway Manufacturing, LLC | Ankeny | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Denison | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Atlantic | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Creston | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Audubon | Audubon | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix - Audubon Facility | Audubon | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Manning | Manning | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Mt. Ayr | Mount Ayr | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Perry | Perry | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Shenandoah | Shenandoah | — | ◇ UNVERIFIED |
| CGCertainteed Gypsum & Ceiling Mfg, INC | Fort Dodge | — | ◇ UNVERIFIED |
| CMConcrete Mobility | Lakota | — | ◇ UNVERIFIED |
| CSConcrete Supply | Council Bluffs | — | ◇ UNVERIFIED |
| CSConstruction Safety Experts INC. | De Witt | — | ◇ UNVERIFIED |
| CCContinental Cement Company - Davenport Plant | Buffalo | — | ◇ UNVERIFIED |
| DRDyersville Ready-mix Plant | Dyersville | — | ◇ UNVERIFIED |
| FSFour Seasons Excavation and Landscaping, INC. | West Burlington | — | ◇ UNVERIFIED |
| GAGcc Alliance - Cherokee Washborn | Cherokee | — | ◇ UNVERIFIED |
| GRGcc Ready Mix | Sergeant Bluff | — | ◇ UNVERIFIED |
| GPGrandscape Precast, Inc. | Crescent | — | ◇ UNVERIFIED |
| HRHamilton Ready Mix | Fort Dodge | — | ◇ UNVERIFIED |
| HRHawkeye Ready Mix | Iowa City | — | ◇ UNVERIFIED |
| HRHawkeye Ready-mix, INC. | Cedar Rapids | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix - Chariton | Chariton | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix - Fort Madison | Fort Madison | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix - Mt. Pleasant | Mount Pleasant | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix - Ottumwa | Ottumwa | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix - Pella | Pella | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix - Washington | Washington | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix - West Burlington | West Burlington | — | ◇ UNVERIFIED |
| IPIJA Properties LLC | Farley | — | ◇ UNVERIFIED |
| LRLiberty Ready Mix Plant 3 | Des Moines | — | ◇ UNVERIFIED |
| LCLiebus Concrete, Inc. | Oskaloosa | — | ◇ UNVERIFIED |
| LCLiebus Concrete, Inc. | Oskaloosa | — | ◇ UNVERIFIED |
| MLMfi, LLC | Winterset | — | ◇ UNVERIFIED |
| MGMid-American Glass, Inc. | Davenport | — | ◇ UNVERIFIED |
| MCMidland Concrete Products | Hiawatha | — | ◇ UNVERIFIED |
| MCMobile Crushing and Recycling, INC | Otho | — | ◇ UNVERIFIED |
| NGNational Gypsum Company - Fort Dodge | Fort Dodge | — | ◇ UNVERIFIED |
| NRNorwalk Ready Mixed Concrete INC. - Desoto | De Soto | — | ◇ UNVERIFIED |
| RURail.one USA CORP. | Clinton | — | ◇ UNVERIFIED |
| SSShondel's Stone Creations | Centerville | — | ◇ UNVERIFIED |
| SRStandard Ready Mix - Sergeant Bluff Plant | Sergeant Bluff | — | ◇ UNVERIFIED |
| SKStonehouse Kitchens and Granite LLC | Urbandale | — | ◇ UNVERIFIED |
| TMTcc - Muscatine | Muscatine | — | ◇ UNVERIFIED |
| TSThe Stone Shop | Ankeny | — | ◇ UNVERIFIED |
