| HOHighland Ornamental Ironworks INC | Berryville | VA | — | ◇ UNVERIFIED |
| HIHiler's Ironworks LLC | Cave Junction | OR | — | ◇ UNVERIFIED |
| HNHimco National | Torrance | CA | — | ◇ UNVERIFIED |
| HNHimco Natl INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| HSHi Style Metal Design, Akop Pisikyan Dba | Sun Valley | CA | — | ◇ UNVERIFIED |
| HCHolchris CORP Dba Stahl Mfg of the Bluegrass | Frankfort | KY | — | ◇ UNVERIFIED |
| HBHoof Beat Gates & Corrals | Fallon | NV | — | ◇ UNVERIFIED |
| HHHorns & Hoofs Inc | Vernon Hills | IL | — | ◇ UNVERIFIED |
| HCHosford & Company | Ann Arbor | MI | — | ◇ UNVERIFIED |
| HLHoss Lee Stairways, INC. | Roseville | CA | — | ◇ UNVERIFIED |
| HPHotcoats Powder Coating | Chico | CA | — | ◇ UNVERIFIED |
| HOHouse of Forgings, LLC | Houston | TX | — | ◇ UNVERIFIED |
 Howmedica Osteonics CORP | Murray | UT | — | ◇ UNVERIFIED |
| HRH R Leuenberger Incorporated | Allison Park | PA | — | ◇ UNVERIFIED |
| HHubzco | Saint Louis | MO | — | ◇ UNVERIFIED |
| HMHughes Metal Works, LLC | Greensboro | NC | — | ◇ UNVERIFIED |
| HDHunter Douglas Architectural Products INC. | Norcross | GA | — | ◇ UNVERIFIED |
| HMHunter Metal | Tahoe Vista | CA | — | ◇ UNVERIFIED |
| IEIan Eddy Blacksmith | Saxtons River | VT | — | ◇ UNVERIFIED |
| IIIda Installations, INC. | Southington | CT | — | ◇ UNVERIFIED |
| IMIgnacio Martinez Dba Sunset and Company | Apple Valley | CA | — | ◇ UNVERIFIED |
| IIIkg/borden (ikg Industries) | Leeds | AL | — | ◇ UNVERIFIED |
| IIIkg Industries | Nashville | TN | — | ◇ UNVERIFIED |
| IRImperial Rotary Dies | Santa Fe Spgs | CA | — | ◇ UNVERIFIED |
| ISImperial Steel Craft INC | Hillsboro | OR | — | ◇ UNVERIFIED |
| IPInd Polishing & Grinding/york | York | PA | — | ◇ UNVERIFIED |
| ILInesh LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| IIInnovations in Iron INC | Eugene | OR | — | ◇ UNVERIFIED |
| IAInnovative Architectural Solutions INC | Ontario | CA | — | ◇ UNVERIFIED |
| IMInnovative Metal Design INC | Troutdale | OR | — | ◇ UNVERIFIED |
| IMInnovative Metal Solutions | Mount Holly | NJ | — | ◇ UNVERIFIED |
| IIInstatech Industries, Inc. | Oakland Park | FL | — | ◇ UNVERIFIED |
| IIntellicept | El Cajon | CA | — | ◇ UNVERIFIED |
| IIInternational Iron Works LLC | Arvada | CO | — | ◇ UNVERIFIED |
| IWInternational West, INC Dba Continental Industries | Anaheim | CA | — | ◇ UNVERIFIED |
| IWInternational Wrought Iron Lt | Chino | CA | — | ◇ UNVERIFIED |
| ICIron City Iron Works Inc | Trussville | AL | — | ◇ UNVERIFIED |
| ICIron City Mfg INC | Pacoima | CA | — | ◇ UNVERIFIED |
| IIIronfire, INC | Brainerd | MN | — | ◇ UNVERIFIED |
| IGIron Gate Shoppe | Puyallup | WA | — | ◇ UNVERIFIED |
| IIIron Innovations, INC | Madison | MS | — | ◇ UNVERIFIED |
| IMIron Man Mize, LLC | Bogart | GA | — | ◇ UNVERIFIED |
| ILIron&Oak LLC | Bethel | CT | — | ◇ UNVERIFIED |
| IMIronside Metal Works | Arcata | CA | — | ◇ UNVERIFIED |
| IMIronstone Metal Works | San Carlos | CA | — | ◇ UNVERIFIED |
| ISIrontree Solutions, LLC | Williams | CA | — | ◇ UNVERIFIED |
| IWIron World Manufacturing LLC | Laurel | MD | — | ◇ UNVERIFIED |
| IBItw Building Components Group INC. | Earth City | MO | — | ◇ UNVERIFIED |
| JCJack's Custom Steel Products | Arcadia | OK | — | ◇ UNVERIFIED |
| JGJacob Gilliam | Bryan | TX | — | ◇ UNVERIFIED |
