| Jefferson Electric Company, Inc. | Beaumont | TX | $0 |
| Jemco Electrical Contractors, Inc. | Jamaica | NY | $0 |
| Jenco Electric LLC | Scottsdale | AZ | $0 |
| Jen Electric Inc. | Springfield | NJ | Subcontractor |
| Jensco, Inc. | Salinas | CA | $0 |
| Jerry Pybus Electric, Inc. | Panama City | FL | Subcontractor |
| Jess Howard Electric Company | Blacklick | OH | Subcontractor |
| J Fire Protection Inc. | Queens Village | NY | $0 |
| J.F.L. Electric, Inc. | Los Angeles | CA | $0 |
| J & G Electric Co. Inc. | Roswell | NM | $0 |
| Jimco Electrical Contracting, Inc. | Lebanon | OR | Subcontractor |
| Jk Electric Limited Liability Company | Denver | CO | $0 |
| J & L Electric Of Battle Creek Inc. | Battle Creek | MI | $0 |
| Jmac Electric LLC | Tucson | AZ | $0 |
| J & M Brown Company, Inc. | Dedham | MA | $0 |
| Jm Electrical Company, Inc. | Lynnfield | MA | Subcontractor |
| JMS Group LLC | Glen Allen | VA | $0 |
| Jmsi Electrical Guam LLC | Tamuning | GU | Subcontractor |
| Joe Lunardi Electric, Inc. | Santa Rosa | CA | $0 |
| John A. Sullivan Electrical Contractor Inc. | Boonton | NJ | $0 |
| John H. Hykes, Inc. | Lancaster | PA | $0 |
| Johnson Engineered Systems, Inc. | Salinas | CA | $0 |
| Johnson-peltier | Santa Fe Springs | CA | $0 |
| Johnston G.p. Inc. | Springfield | NJ | Subcontractor |
| Johnston Technical Services, Inc. | Dallas | TX | $0 |
| J.o Mory, Inc. | South Milford | IN | $0 |
| Jones Electric Co. LLC | Florence | AL | $0 |
| Jordan Electric Company | Columbus | GA | Subcontractor |
| Jose A.trevino | Uvalde | TX | $0 |
| J-pax Company | Mcloud | OK | Subcontractor |
| J Pex Solutions Inc. | Bakersfield | CA | Subcontractor |
| JPT, LLC | Catonsville | MD | Subcontractor |
| J&R Electric, Inc. | Pierrepont Manor | NY | Subcontractor |
| Jsi Technology Inc. | Huntsville | AL | Subcontractor |
| JSK Company, Inc. | Little Rock | AR | $0 |
| J. T. Yates Electric Service, Inc. | Rockingham | NC | Subcontractor |
| J W Electric, LLC | Idaho Falls | ID | $0 |
| Kain Energy, Corp. | Waukesha | WI | $0 |
| Kansas City Audio-visual, Inc. | Kansas City | MO | $0 |
| Kaough & Jones Electric Co. Inc. | Lake Charles | LA | Subcontractor |
| Kasselman Electric Co. Inc. | Menands | NY | Subcontractor |
| KBR Rural Public Power District | Ainsworth | NE | $0 |
| K C Electric, Inc. | Deridder | LA | $0 |
| KDC Inc. | Los Alamitos | CA | Subcontractor |
| K & D Electric, Inc. | Blackfoot | ID | Subcontractor |
| Kearney Electric, Inc. | Phoenix | AZ | Subcontractor |
| Keiser Electric, Inc. | Haltom City | TX | $0 |
| Ken Curran Electric, Inc. | Hesperia | CA | Subcontractor |
| Ken Nix & Associates, Inc. | Peachtree City | GA | $0 |
| Key Communications, LLC | Tulsa | OK | $0 |
| Key Electric And Automation Inc. | Winona | MN | $0 |
| Key Systems, Inc. | White Marsh | MD | Subcontractor |
| Kinden CorporationIwakuni · UEI N9RAWZDHR2M5 | Iwakuni | | Subcontractor |
| Kinden CorporationTamuning, GU · UEI VVL8NMWAGRZ4 | Tamuning | GU | Subcontractor |
| King Solar Inc. | Hutchinson | KS | Subcontractor |
| Kinly Inc. | Cedar Knolls | NJ | $0 |
| Klecka Electric Co. Inc. | San Antonio | TX | Subcontractor |
| K & M Electrical Services, Inc. | White Plains | MD | Subcontractor |
| KND Licensed Electrical Contracting & Services Corp. | Deer Park | NY | $0 |
| Knight Communications, Inc. | Elkton | VA | Subcontractor |
| Knight Sound & Lighting Inc. | Stow | OH | $0 |
| Kohrmann Electric Co. Inc. | Bartelso | IL | $0 |
| Koivu Electric LLC | Poulsbo | WA | Subcontractor |
| Kreco Electric Inc. | Coal Township | PA | $0 |
| Krieger Electric Co. | Hastings | NE | Subcontractor |
| Kubiak Electric Co. Inc. | Robbinsville | NJ | Subcontractor |
| Kyk Electrical LLC | Honolulu | HI | Subcontractor |
| Lacorte Companies, Inc. | Colonie | NY | $0 |
| Lake Charles Electric Company, L.L.C. | Westlake | LA | $0 |
| Lake Erie Electric Inc. | Westlake | OH | Subcontractor |
| Lamey Electric, Inc. | Biloxi | MS | Subcontractor |
| Lanconnect Inc. | Norristown | PA | $0 |
| Lane Tedder & Associates Inc. | Pearl | MS | $0 |
| Langston Electric | Woodworth | LA | $0 |
| Lan Line Systems Inc. | Raleigh | NC | $0 |
| Lansystem Pte. Ltd. | Singapore | | $0 |
| Larry & Matt Inc. | Pampa | TX | Subcontractor |
| Laser Electric Inc. | Peoria | IL | $0 |
| Latham Electrical Co. | Jacksonville | NC | Subcontractor |
| Lawson Electric Company, Inc. | Hixson | TN | Subcontractor |
| Layer One Inc.Newburg, MD · UEI ETU7NSL5FF49 | Newburg | MD | Subcontractor |
| Layer One Inc.Catonsville, MD · UEI UMTMCN6KNGH5 | Catonsville | MD | Subcontractor |
| L. Cannon Communications, LLC | Pittsburgh | PA | $0 |
| LCN Partners, Inc. | Essington | PA | Subcontractor |
| L-D Systems, L.P | Houston | TX | $0 |
| Leading-edge Services Inc. | Buchanan | VA | $0 |
| Lea Electric, L.L.C. | Meridian | ID | $0 |
| L. E. Ballance Electrical Service, Inc. | Chesapeake | VA | $0 |
| Led Power Technologies (ea) K Limited | Nairobi | | $0 |
| Leer Electric Inc. | Dillsburg | PA | Subcontractor |
| Lees Electrical Contracting Inc. | Essex | MD | $0 |
| Lei Companies, Inc. | Denver | CO | $0 |
| Lek Technology Group LLC | Prattville | AL | Subcontractor |
| Leleiwi Electric Inc. | Hilo | HI | $0 |
| Lenz Electric, Inc. | Colorado Springs | CO | Subcontractor |
| Leonard Crawford Electric, LLC | Tunkhannock | PA | Subcontractor |
| Levest Electric Corp. | New York | NY | $0 |
| Lewis Electric Co. | North Sioux City | SD | Subcontractor |
| Leyden Electric, Inc. | Elburn | IL | $0 |
| Lianova Solutions LLC | Baltimore | MD | Subcontractor |
