| Hawkeye Electric, Inc. | Chandler | AZ | Subcontractor |
| Hayre Mcelroy & Associates LLC | Dallas | TX | Subcontractor |
| Hayre Mcelroy & Associates, LLC | Kapolei | HI | Subcontractor |
| HBM Engineering Group, LLC | Hillside | IL | $0 |
| H.c. Engineering, Inc. | Westminster | CO | Subcontractor |
| HDL Engineering Consultants LLC | Anchorage | AK | Subcontractor |
| HDR Engineering, Inc.Austin, TX · UEI DN8UM1C68V41 | Austin | TX | $0 |
| HDR Engineering, Inc.Tampa, FL · UEI J1N8RCJR52M5 | Tampa | FL | $0 |
| HDR, Inc. | Omaha | NE | Subcontractor |
| HDR International, Inc. | Omaha | NE | Subcontractor |
| HDR/RBF A Joint Venture | Irvine | CA | $0 |
| Head Italia - Societa' Per Azioni | Roma | RM | Subcontractor |
| Heavy Metal Systems LLC | San Diego | CA | Subcontractor |
| Hebco, Inc. | Pittsburgh | PA | Subcontractor |
| Hebert & Associates, LLC | Bristow | VA | Subcontractor |
| Heinrich Design Resources, Inc. | Longwood | FL | Subcontractor |
| Helenschmidt Geotechnical, Inc. | Carlsbad | CA | Subcontractor |
| Helmig Lienesch LLC | Dayton | OH | Subcontractor |
| Henderson & Associates, PLLC | Ponte Vedra Beach | FL | Subcontractor |
| Henderson Engineers Inc. | Overland Park | KS | Subcontractor |
| Henneman Engineering Inc. | Champaign | IL | Subcontractor |
| Herbert Rowland & Grubic Inc. | Harrisburg | PA | $0 |
| Heritage Systems Engineering, LLC | Oak Ridge | TN | Subcontractor |
| Hesnor Engineering Associates, PLLC | Albany | NY | Subcontractor |
| Hey & Associates Inc. | Volo | IL | $0 |
| HHB Engineers PC | Tuscaloosa | AL | Subcontractor |
| Hicks Electronic Design, Inc. | Fort Collins | CO | Subcontractor |
| Hicks Range & Spaceport Consulting LLC | Las Cruces | NM | Subcontractor |
| Hida Okamoto & Associates Inc. | Honolulu | HI | Subcontractor |
| High Bridge Associates, Inc. | Greensboro | GA | Subcontractor |
| High Impact Services, Inc. | Fishers | IN | Subcontractor |
| HII Fleet Support Group LLC | Newport News | VA | Subcontractor |
| HII Mission Technologies Corp.Syracuse, NY · UEI T14DRVDRSZM9 | Syracuse | NY | Subcontractor |
| HII Mission Technologies Corp.Warner Robins, GA · UEI HYGYE5RSLEK5 | Warner Robins | GA | Subcontractor |
| HII Mission Technologies Corp.Shalimar, FL · UEI L28JWNM4ZX45 | Shalimar | FL | Subcontractor |
| HII Mission Technologies Corp.San Antonio, TX · UEI LMKLBWF47553 | San Antonio | TX | Subcontractor |
| HII Mission Technologies Corp.Norfolk, VA · UEI RND8QCJHEGV5 | Norfolk | VA | Subcontractor |
| Hillis-carnes Capitol Services PLLC | Washington | DC | Subcontractor |
| Hillis-carnes Engineering Associates, Inc. | Annapolis Junction | MD | Subcontractor |
| Hill Park Engineering Inc. | Beltsville | MD | Subcontractor |
| Hirani Engineering And Land Surveying, D.P.C. | Hicksville | NY | Subcontractor |
| Hirata & Associates Inc. | Aiea | HI | Subcontractor |
| Hitachi Rail STS USA Inc. | Pittsburgh | PA | $0 |
| Hi-tek Professionals, Inc. | Media | PA | Subcontractor |
| HMS Incorporated | Anchorage | AK | Subcontractor |
| HNTB New York Engineering, Architecture And Landscape Architecture, P.C. | New York | NY | $0 |
| Hockema Group Inc. | Seattle | WA | $0 |
| Hodgson Consulting Enterprises LLC | Irwin | PA | $0 |
| Hofschneider Engineering Corporation | Saipan | MP | Subcontractor |
| Holcomb Foundation Engineering Company Inc. | Carbondale | IL | $0 |
| Holifield Engineering Inc. | Summit | MS | $0 |
| Holihan Associates LLC | Beaufort | SC | $0 |
| Holistic Hardening Industries LLC | Melbourne | FL | Subcontractor |
| Holtec Government Services LLC | Camden | NJ | Subcontractor |
| Honovee, LLC | Clarksville | MD | Subcontractor |
| Hood Engineering And Consulting Services, LLC | Arnold | MD | Subcontractor |
| Hooku Consulting Engineers LLC | Kailua | HI | $0 |
| Hoque & Associates, Inc. | Phoenix | AZ | Subcontractor |
| Horrocks LLC | Pleasant Grove | UT | Subcontractor |
| Hoss & Brown Engineers Inc. | Shawnee | KS | Subcontractor |
| Houston Engineering Inc. | Fargo | ND | Subcontractor |
| Howard K. Bell, Consulting Engineers, Inc. | Lexington | KY | Subcontractor |
| Hoyle Tanner & Associates Inc. | Manchester | NH | $0 |
| Hpi Energy Services, LLC | Tomball | TX | Subcontractor |
| HR Wallingford Inc. | Houston | TX | Subcontractor |
| Hsa Engineering, Inc. | Cupertino | CA | Subcontractor |
| Hughes Design Group | El Segundo | CA | Subcontractor |
| Huitt - Zollars, Inc.San Diego, CA · UEI CH7QNMBSAHT7 | San Diego | CA | Subcontractor |
| Huitt - Zollars, Inc.Alexandria, VA · UEI F5F8YWY9BHF3 | Alexandria | VA | Subcontractor |
| Huitt - Zollars, Inc.Seattle, WA · UEI LJKJD65YEK29 | Seattle | WA | Subcontractor |
| Huitt - Zollars, Inc.Houston, TX · UEI TE2UF5DKK3B7 | Houston | TX | $0 |
| Huitt-zollars Inc.Dallas, TX · UEI HVLYQETLZHY9 | Dallas | TX | Subcontractor |
| Huitt-zollars Inc.Irvine, CA · UEI PTXNT4Q48JF9 | Irvine | CA | $0 |
| Hukariascendent Inc. | Wheat Ridge | CO | Subcontractor |
| Humanproof, LLC | Vienna | VA | Subcontractor |
| Hunsaker & Associates Irvine, Inc. | Irvine | CA | $0 |
| Hunt Construction Group Inc. | Indianapolis | IN | $0 |
| Huntsley Innovations, LLC | Gurley | AL | Subcontractor |
| Huron Engineering And Surveying, Inc. | Alpena | MI | $0 |
| Hurst-rosche Inc. | Arnold | MO | $0 |
| Hushmand Associates, Inc. | Irvine | CA | Subcontractor |
| Huval & Associates, Inc. | Lafayette | LA | $0 |
| HVJ Associates, Inc. | Houston | TX | Subcontractor |
| H. W. Lochner, Inc. | Chicago | IL | $0 |
| Hybrid Design Services, Inc. | Troy | MI | Subcontractor |
| Hybrid Robotics, Inc. | Traverse City | MI | Subcontractor |
| Hydro Expertise USA LLC | Boca Raton | FL | Subcontractor |
| Hydro Modeling Inc. | Orlando | FL | $0 |
| Hydroscience Engineers, Inc. | Sacramento | CA | $0 |
| Hypersoft Inc. | Saint Charles | MO | Subcontractor |
| Ibaset Federal Services, LLC | Lake Forest | CA | Subcontractor |
| Ibc Engineering Services, Inc. | Milwaukee | WI | $0 |
| Icc Nta LLC | Nappanee | IN | Subcontractor |
| Ici Engineers, Inc. | Walnut | CA | Subcontractor |
| Icld, Inc. | Pass Christian | MS | Subcontractor |
| Icon Engineering, Inc. | Centennial | CO | $0 |
| Iconergy Ltd. | Denver | CO | Subcontractor |
| Ic Thomasson Associates Inc. | Nashville | TN | Subcontractor |
| Iea Inc. | Dallas | TX | Subcontractor |
| I.e. Engineering, Inc. | Roseburg | OR | $0 |
