| Capital Communications And Consulting, LLC | Oviedo | FL | Subcontractor |
| Capo Projects Group, LLC | San Clemente | CA | Subcontractor |
| Caprock Intelligence L.L.C. | Broomfield | CO | Subcontractor |
| Carl C. Bosland | San Diego | CA | $0 |
| Carly Jo Goven | Valley City | ND | $0 |
| Carr Astronautics Corp. | Greenbelt | MD | Subcontractor |
| Cary Morgen Labor Arbitration & Mediation Services LLC | Chicago | IL | $0 |
| Casalino Lawrence | New York | NY | $0 |
| Castelios LLC | Falls Church | VA | Subcontractor |
| Catapult Federal Services LLC | Plano | TX | Subcontractor |
| CCS International, Inc.Houston, TX · UEI DMJ2ULHCBHT1 | Houston | TX | Subcontractor |
| CCS International, Inc.Oakbrook Terrace, IL · UEI MXR3MJ5ZKHQ3 | Oakbrook Terrace | IL | Subcontractor |
| Cde Integrated Systems Inc. | Jackson | MS | $0 |
| Cease Consulting, LLC | Potomac | MD | Subcontractor |
| Celia Rateliff | Fort Collins | CO | $0 |
| Celtic Corporation | Troy | MI | $0 |
| Center For Energy And Environment | Minneapolis | MN | Subcontractor |
| Center For Health Policy Development (the) | Washington | DC | Subcontractor |
| Center For Inclusive Policy | Washington | DC | Subcontractor |
| Center For Land Reform, Inc. | Flint | MI | $0 |
| Center For Self Determination | Wayne | MI | $0 |
| Center Mass Consulting And Technologies LLC | Huntsville | AL | Subcontractor |
| Centre For Infectious Disease Research In Zambia | Lusaka | | Subcontractor |
| Centro Del Agua Del Tropico Humedo Para America Latina Y El Caribe | Panama | PANANMA | $0 |
| Centro Internacional De Agricultura Tropical | Palmira | VALLE DEL CAUCA | Subcontractor |
| Century Aviation | East Wenatchee | WA | $0 |
| Chad Richardson Precision Measuring, Inc. | Mount Airy | NC | $0 |
| Channell Communications Inc. | Tuscaloosa | AL | $0 |
| Chaordic Balance | Oakland | CA | $0 |
| Charles Howard Sobey | Plano | TX | Subcontractor |
| Chemsultants International, Inc. | Mentor | OH | $0 |
| Chesapeake Aerospace Engineering, Inc. | Ellicott City | MD | Subcontractor |
| Children's Environmental Health Network | Washington | DC | $0 |
| Chloe Ashlynn Woods | San Leandro | CA | $0 |
| Chrisann Schiro-geist | Memphis | TN | $0 |
| Christian Neil Pettigrew | Colorado Springs | CO | $0 |
| Circa-cultural Resource Management, L.L.C | Williamsburg | VA | Subcontractor |
| Cis International LLC | San Lorenzo | PR | $0 |
| City Of Webb City | Webb City | MO | $0 |
| Clasp | Washington | DC | Subcontractor |
| Clean Air Engineering Inc. | Palatine | IL | Subcontractor |
| Clearwater Services Incorporated | Akron | OH | $0 |
| Clicksafety.com, Inc. | Burlington | MA | Subcontractor |
| Cloud Technology Innovations, LLC | Chesterfield | MO | Subcontractor |
| CLS Mitigation & Consulting Services, L.L.C | Kansas City | MO | $0 |
| Coastal Communications Consultants, Inc. | Manassas | VA | $0 |
| Coastwise Marine Chemist, Inc. | Yorktown | VA | $0 |
| Coffman Associates, Inc. | Overland Park | KS | $0 |
| Cognovi Government Services, LLC | Dayton | OH | Subcontractor |
| Cohere Services, LLC | Herndon | VA | Subcontractor |
| Cold Climate Housing Research Center, Inc. | Fairbanks | AK | $0 |
| Collaborative Processes LLC | Denver | CO | $0 |
| Collaborative Solutions Inc. | Birmingham | AL | Subcontractor |
| Communications Quest Technologies LLC | Havre De Grace | MD | Subcontractor |
| Community Counselling Service Co. LLC | New York | NY | $0 |
| Composite Support And Solutions Inc. | San Pedro | CA | $0 |
| Comprel, Inc. | Raleigh | NC | $0 |
| Compstak, Inc. | New York | NY | $0 |
| Compuone Corporation | San Diego | CA | $0 |
| Computer 1 Products Of America, Inc. | Long Beach | CA | $0 |
| Connectium Technologies, LLC | Pasadena | MD | Subcontractor |
| Connect Partners Inc. | Trumbull | CT | $0 |
| Connico, LLC | Mount Juliet | TN | Subcontractor |
| Consensus Systems Technologies Corporation | New York | NY | Subcontractor |
| Conservation Strategy Fund | Washington | DC | Subcontractor |
| Construction Business Associates LLC | West End | NC | $0 |
| Continental Fire & Safety Services, LLC | Rockville | MD | $0 |
| Contractors Consultants & Management Inc. | Memphis | TN | Subcontractor |
| Corsair Group LLC | Evergreen | CO | Subcontractor |
| Cost Atelier, LLC | Loveland | CO | Subcontractor |
| Council Of Graduate Schools, Inc. (the) | Washington | DC | $0 |
| Cox Marion | Santa Fe | NM | $0 |
| Cra, Inc. | Nashville | TN | $0 |
| Cranes & Materials Handling Inc. | Bloomfield | NM | $0 |
| CRC Technologies, Inc. | West Chester | OH | Subcontractor |
| Creative Defense Consulting LLC | Herndon | VA | Subcontractor |
| Creative Solutions Technical Services, Inc. | Alexandria | VA | Subcontractor |
| Crescent Bridge, LLC | Bluffton | SC | Subcontractor |
| Crescent City Insights, LLC | New Orleans | LA | Subcontractor |
| Crest Creek Consulting LLC | Clarksburg | MD | Subcontractor |
| Crimson Capital Corp. A Delaware Corp. | Atlanta | GA | Subcontractor |
| Crossmerge, LLC | Bunker Hill | WV | Subcontractor |
| Crossover Solutions National Security USA Inc. | Livonia | MI | Subcontractor |
| Crystal, Jules I | Chicago | IL | $0 |
| Csuptwo LLC | Milwaukee | WI | Subcontractor |
| CTC Group Inc. | Vienna | VA | Subcontractor |
| Cuas Solutions, LLC | Bushnell | FL | Subcontractor |
| Cumming Management Group, Inc. | Westport | CT | Subcontractor |
| Currie & Brown, Inc. | Princeton | NJ | Subcontractor |
| Cutaway Creations LLC | Summit Point | WV | $0 |
| Cybele Data Advisory LLC | Springfield | VA | Subcontractor |
| Cyber Bytes Foundation | Stafford | VA | Subcontractor |
| Cyberhill Intel LLC | Frederick | MD | Subcontractor |
| Cynthia Stanley | Pendleton | IN | $0 |
| Daly Joseph L | Minneapolis | MN | $0 |
| Damron James | Charleston | WV | $0 |
| Dana Moffett | Takoma Park | MD | $0 |
| Daniel E Myers | Byram | MS | $0 |
| Dartnet Institute | Aurora | CO | Subcontractor |
| Dataflow Informatics LLC | Folly Beach | SC | Subcontractor |
