| Glumac | San Diego | CA | Subcontractor |
| GM2 Associates, Inc. | Glastonbury | CT | Subcontractor |
| Gmu Geotechnical Inc. | Rancho Santa Margarita | CA | Subcontractor |
| GMV Innovating Solutions Inc. | Rockville | MD | Subcontractor |
| GNCB Consulting Engineers PC | Old Saybrook | CT | Subcontractor |
| Godfroy Consulting LLC | Huntsville | AL | Subcontractor |
| Gohypersonic Incorporated | Minneapolis | MN | $0 |
| Golden Ratio Management Corporation | Fort Worth | TX | Subcontractor |
| Goldie & Associates Inc. | Seneca | SC | $0 |
| Goleta Engineering | Santa Barbara | CA | $0 |
| Gomez And Sullivan Engineers, D.P.C. | New Hartford | NY | Subcontractor |
| Gonzalez-strength & Associates Inc. | Hoover | AL | Subcontractor |
| Good Multi-domain Solutions, LLC | Doylestown | PA | Subcontractor |
| Gordon H Smith Corp. | New York | NY | Subcontractor |
| Gordon US, LLC | Chantilly | VA | Subcontractor |
| Gorove/slade Associates, Inc. | Fairfax | VA | Subcontractor |
| Go Systems & Solutions LLC | Jamaica Plain | MA | Subcontractor |
| Gotech, Inc. | Baton Rouge | LA | $0 |
| GPH Consulting, LLC | Charleston | SC | $0 |
| GPS Design Inc. | Winston Salem | NC | Subcontractor |
| GPW & Associates LLC | Lawrence | KS | $0 |
| Graef-usa Inc. | Milwaukee | WI | Subcontractor |
| Granger Timothy Allen | Pickens | SC | Subcontractor |
| Granite Engineering Group Inc. | Colorado Springs | CO | Subcontractor |
| Grant Engineering & Construction Group LLC | Newark | NJ | $0 |
| Gray Beards Engineering LLC | Goode | VA | Subcontractor |
| Gray Digital LLC | Columbia | MD | Subcontractor |
| Gray Hong Nojima & Associates Inc. | Honolulu | HI | Subcontractor |
| Great Basin Engineering Inc. | Ogden | UT | $0 |
| Great Northern Engineering, LLC. | Wasilla | AK | $0 |
| Green Engineering P.L.L.C. | Wilson | NC | Subcontractor |
| Green - Go Enterprises, Inc. | Weston | FL | Subcontractor |
| Greenhouse Design LLC | Burbank | OH | Subcontractor |
| Greenman-pedersen Inc. | Jacksonville | FL | Subcontractor |
| Greenman-pedersen, Inc. | Rockville | MD | Subcontractor |
| Greenpoint Freese And Nichols JV | New Orleans | LA | Subcontractor |
| Green Seal Environmental, LLC | Sagamore Beach | MA | Subcontractor |
| Greentech Energy Services Inc. | Maple Shade | NJ | Subcontractor |
| Greenway Engineering, Inc. | Winchester | VA | $0 |
| Gretchen Coleman Commissioning Group, LLC | Roanoke | VA | Subcontractor |
| Griffiths Stewart | Albuquerque | NM | $0 |
| Grounded Engineering Consultants LLC | Knoxville | TN | Subcontractor |
| Ground Engineering Consultants, Inc. | Englewood | CO | Subcontractor |
| Ground Technology, Inc. | Pittsburgh | PA | $0 |
| Group14 Engineering, PBC | Denver | CO | Subcontractor |
| Group Delta Consultants, Inc. | Irvine | CA | Subcontractor |
| Group-s LLC | New York | NY | Subcontractor |
| Grubb Engineering, Inc. | San Antonio | TX | Subcontractor |
| Grubbs, Hoskyn, Barton & Wyatt, LLC | Little Rock | AR | Subcontractor |
| Grupo Covix | Alvaro Obregon | | Subcontractor |
| GRW Engineers Inc. | Lexington | KY | $0 |
| Gryphon Vallecitos Laboratories, LLC | Sunol | CA | $0 |
| GTS, Inc. | Fayetteville | AR | $0 |
| Gulf County Shipbuilding, Inc. | Port St Joe | FL | $0 |
| Gulf South Engineering & Testing Inc. | Kenner | LA | $0 |
| Gulf States Engineering Inc. | Mobile | AL | Subcontractor |
| Gulf States Engineering Of Mississippi, Inc. | Gulfport | MS | Subcontractor |
| Gulfview Research, Inc. | Fort Walton Beach | FL | Subcontractor |
| Gutierrez-palmenberg, Inc. | Tempe | AZ | $0 |
| Guy Engineering Services, Inc. | Tulsa | OK | Subcontractor |
| Gvi, Inc. | Middletown | RI | Subcontractor |
| G & W Engineers, Inc. | Port Lavaca | TX | $0 |
| Gxa Consulting LLC | Ely | IA | Subcontractor |
| Gymo, Architecture, Engineering & Land Surveying D.P.C. | Watertown | NY | $0 |
| H2engineering, Inc. | Tallahassee | FL | Subcontractor |
| H2M Architects, Engineers, Geology, Land Surveying And Landscape Architecture, D.P.C | Melville | NY | Subcontractor |
| H2M Associates, Inc. | Parsippany | NJ | Subcontractor |
| H2R Corp. | Pinellas Park | FL | Subcontractor |
| Hackett Insight LLC | Fort Washington | PA | Subcontractor |
| Hadronex, Inc. | Escondido | CA | Subcontractor |
| Hainz Engineering Services, Inc. | Chandler | AZ | Subcontractor |
| Hale Engineering & Surveying, Inc. | San Diego | CA | Subcontractor |
| Halff Associates, Inc.Austin, TX · UEI GXDAAZA5K5V5 | Austin | TX | Subcontractor |
| Halff Associates, Inc.Austin, TX · UEI HHV3AJD7QA81 | Austin | TX | Subcontractor |
| Hall Engineering Group, Inc. | Tampa | FL | Subcontractor |
| Halpin Engineering, LLC | Torrance | CA | Subcontractor |
| Hammer Defense Technologies LLC | Grant Valkaria | FL | Subcontractor |
| Handy Marine Engineering PLLC | Seattle | WA | Subcontractor |
| Hankins & Anderson Inc. | Arlington | VA | Subcontractor |
| Hanmi C & E Co.,ltd. | Seoul | | $0 |
| Hanover Land Services, Inc. | Hanover | PA | $0 |
| Hansen & Associates, Inc. Consulting Engineers & Land Surveyors | Brigham City | UT | Subcontractor |
| Haptech, Inc. | New Orleans | LA | $0 |
| Hargis Engineers, Inc. | Seattle | WA | $0 |
| Hargrove & Associates Inc. | Mobile | AL | Subcontractor |
| Harms Engineering Inc. | Pasco | WA | $0 |
| Harold G. Jones Co. | Houston | PA | $0 |
| Harper Consulting, LLC | Bowie | MD | Subcontractor |
| Harper Houf Peterson Righellis, Inc. | Portland | OR | $0 |
| Harrell, Greg | Jefferson City | TN | $0 |
| Harrington Group, Inc. | Duluth | GA | Subcontractor |
| Harris & Associates, Inc. | Concord | CA | $0 |
| Harris Consulting Engineers, LLC | Las Vegas | NV | Subcontractor |
| Hartman Engineering Inc. | Kenner | LA | $0 |
| H. A. Spalding, Inc. | Hazard | KY | $0 |
| Hassan Water Resources, PLC | Maidens | VA | Subcontractor |
| Hatch Associates Consultants, Inc. | Pittsburgh | PA | Subcontractor |
| Hatcher Engineering Inc. | Plant City | FL | Subcontractor |
| Hawaiian Corrosion Services LLC | Pearl City | HI | Subcontractor |
| Hawk Associates, LLC | Sierra Vista | AZ | Subcontractor |
