| HWHeidelberg - Watertown Quarry | Pamelia | NY | — | ◐ LIKELY ACTIVE |
| HMHeidleberg Materials Southeast Agg LLC - Rougemont | Rougemont | NC | — | ◐ LIKELY ACTIVE |
| HSHelena Sand & Gravel, INC | Helena | MT | 100–499 | ◐ LIKELY ACTIVE |
| HRHengel Ready Mix and Construction, Inc | Pillager | MN | 20–99 | ◐ LIKELY ACTIVE |
| HEHeritage Environmental Svcs LLC | Kansas City | MO | — | ◐ LIKELY ACTIVE |
| HLHermann Lumber Company Ready Mix | Hermann | MO | — | ◐ LIKELY ACTIVE |
| HRHernando Redi Mix | Nesbit | MS | — | ◐ LIKELY ACTIVE |
| HCHerzog Contracting (asphalt Plant) (portable)(air) | Portable | KS | — | ◐ LIKELY ACTIVE |
| HRHess Ready Mix Concrete | Schuylkill Haven | PA | — | ◐ LIKELY ACTIVE |
| HCHgr Cement, LLC | Mesquite | TX | — | ◐ LIKELY ACTIVE |
| HHH & H Paving, LLC | Quitman | GA | — | ◐ LIKELY ACTIVE |
| HMHighway Materials Inc/perkiomenville | Perkiomenville | PA | — | ◐ LIKELY ACTIVE |
| HMHi-grade Materials CO | Hesperia | CA | — | ◐ LIKELY ACTIVE |
| HMHi-Grade Materials-Indio Ready Mix | Indio | CA | 20–99 | ◐ LIKELY ACTIVE |
| HRHiline Redi-mix LLC | Shelby | MT | — | ◐ LIKELY ACTIVE |
| HCHinkle Contracting CO LLC - Casey Asphalt Plant | Bethelridge | KY | — | ◐ LIKELY ACTIVE |
| HCHinkle Contracting CO LLC - Jackson Asphalt Plant | Jackson | KY | — | ◐ LIKELY ACTIVE |
| HCHinkle Contracting CO LLC - Middlesboro Asphalt Plant | Middlesboro | KY | — | ◐ LIKELY ACTIVE |
| HCHinkle Contracting CO LLC - Ravenna Asphalt Plant | Ravenna | KY | — | ◐ LIKELY ACTIVE |
| HCHinkle Contracting Company LLC - Hinkle West Paving Owensboro Asphalt Plant 0464 | Owensboro | KY | — | ◐ LIKELY ACTIVE |
| HPHiwassee Paving, LLC | Chattanooga | TN | — | ◐ LIKELY ACTIVE |
| HPHiwassee Paving, LLC | Calhoun | TN | — | ◐ LIKELY ACTIVE |
| HCHi-Way Concrete Products Co. Inc. | Wareham | MA | 20–99 | ◐ LIKELY ACTIVE |
| HPHi-way Paving | Nashville | TN | — | ◐ LIKELY ACTIVE |
| HJH & J Asphalt INC | Miami | FL | — | ◐ LIKELY ACTIVE |
| HCHk Contractors INC 00004 | Portable | ID | — | ◐ LIKELY ACTIVE |
| HGH&k Grioup Inc/s Rdg Asphalt Fac | Birdsboro | PA | — | ◐ LIKELY ACTIVE |
| HGH&k Group Inc/silver Hill Quarry Crushing Plt | Narvon | PA | — | ◐ LIKELY ACTIVE |
| HPHm Pacific Northwest, INC. Dba Cadman Material INC | Kenmore | WA | — | ◐ LIKELY ACTIVE |
| HSHog Slat INC | Universal | IN | — | ◐ LIKELY ACTIVE |
| HIHolcim, INC. | Memphis | TN | — | ◐ LIKELY ACTIVE |
| HHHorner Holdings, INC - Arkadelphia Ready Mix Concrete Plant | Arkadelphia | AR | — | ◐ LIKELY ACTIVE |
| HOHosea O Weaver and Sons INC | Mobile | AL | — | ◐ LIKELY ACTIVE |
| HFHouston Facility | Houston | TX | 20–99 | ◐ LIKELY ACTIVE |
| HAHowell Asphalt CO | Effingham | IL | — | ◐ LIKELY ACTIVE |
| HIHri Inc/bloomsburg Asphalt Plt | Bloomsburg | PA | — | ◐ LIKELY ACTIVE |
| HIHri Inc/milton Asphalt Plt | Milton | PA | — | ◐ LIKELY ACTIVE |
| HPHubbard Paving & Grading Incorporated | Walhalla | SC | — | ◐ LIKELY ACTIVE |
| HMHudson Materials Site | Chattanooga | TN | — | ◐ LIKELY ACTIVE |
| HCHuffcutt Concrete, INC. | Chippewa Falls | WI | 20–99 | ◐ LIKELY ACTIVE |
| HBHughes Bros., INC. | Hampden | ME | 20–99 | ◐ LIKELY ACTIVE |
| ICIa Const Corp/clarion Hma Plant | Shippenville | PA | — | ◐ LIKELY ACTIVE |
| ICIa Const Corp/franklin Hot Mix Plt | Franklin | PA | — | ◐ LIKELY ACTIVE |
| ITIcco Twin Falls | Twin Falls | ID | — | ◐ LIKELY ACTIVE |
| ICI.c.n. CO. Ready Mix | Bolivar | TN | — | ◐ LIKELY ACTIVE |
| IMIcon Materials Seattle Asphalt | Seattle | WA | — | ◐ LIKELY ACTIVE |
| ITICP Tampa GG | Tampa | FL | 20–99 | ◐ LIKELY ACTIVE |
| ISIdaho Sand & Gravel 00283 | Portable | ID | — | ◐ LIKELY ACTIVE |
| IIdeker | Mosby | MO | — | ◐ LIKELY ACTIVE |
| ISIkard Septic Manufacturing and Sales | Harvest | AL | — | ◐ LIKELY ACTIVE |