| Castro Enterprises Inc. | Rocklin | CA | $0 |
| Catalest LLC | Bethesda | MD | Subcontractor |
| Catalyst Group LLC | Honolulu | HI | $0 |
| Causa Talent Source LLC | Reston | VA | Subcontractor |
| Cayros Group LLC | Miami | FL | Subcontractor |
| CCRC Actuaries, LLC | Reisterstown | MD | Subcontractor |
| Cdci Global LLC | Aldie | VA | $0 |
| Cde Management Consulting LLC | Middle River | MD | Subcontractor |
| Celerity IT, LLC | Mc Lean | VA | Subcontractor |
| Celestar Analytics, LLC | Tampa | FL | Subcontractor |
| Celtic Consulting, LLC | Mclean | VA | Subcontractor |
| Center For Applied Innovation, LLC | Yorktown | VA | $0 |
| Center For Human Services Corporation A/k/a Center For Human Services | Bethesda | MD | $0 |
| Center For Neighborhood Technology | Chicago | IL | Subcontractor |
| Center For Strategy And Development -consulting LLC | Tbilisi | | Subcontractor |
| Center Of Daring LLC | Goddard | KS | Subcontractor |
| Centre De Formation Et D'encadrement Technique S.a. | Port Au Prince | DELMAS | Subcontractor |
| Centre D'etude Et De Cooperation Internationale | Montreal | QC | Subcontractor |
| Centric Consulting LLC | Dayton | OH | Subcontractor |
| Centurion Development Group, L.L.C. | Williamsburg | VA | Subcontractor |
| Centurum Technical Solutions, Inc. | Mc Lean | VA | $0 |
| Certaintech, Inc. | Sterling | VA | Subcontractor |
| Certified Contracting Solutions, LLC | Uvalde | TX | $0 |
| Cevasco International, LLC | Mclean | VA | Subcontractor |
| Charles Tubbs | Madison | WI | $0 |
| C. Harris Companies, Inc. | New Orleans | LA | $0 |
| Chazey Partners, LLC | West Lake Hills | TX | $0 |
| Cheiron Inc. | Mc Lean | VA | $0 |
| Cherktyek Consulting LLC | Coral Springs | FL | Subcontractor |
| Cheryl A Gallant, Inc. | Bangor | ME | $0 |
| Chicago Association For Research & Education In Science | Hines | IL | Subcontractor |
| Children And Family Futures, Inc. | Lake Forest | CA | Subcontractor |
| Children's Trust Fund Alliance | Seattle | WA | Subcontractor |
| Christian Howell LLC | Lawrenceville | GA | $0 |
| Christine Porath Inc. | Matthews | NC | $0 |
| Christopher A. Williams, LLC | Fairfax Station | VA | Subcontractor |
| Christopher F. Conley And Associates, LLC | Reston | VA | Subcontractor |
| Christopher George Peters | Severna Park | MD | Subcontractor |
| Cid Consulting | Cairo | | Subcontractor |
| Cimdata, Inc. | Dexter | MI | $0 |
| Cines, Douglas B | Philadelphia | PA | $0 |
| Cire Business Solutions LLC | Waldorf | MD | Subcontractor |
| City Of Apalachicola | Apalachicola | FL | $0 |
| C J Aron Associates, Inc. | Brooklyn | NY | $0 |
| Clarus Consulting, LLC | Fairfax | VA | Subcontractor |
| Clavis LLC | Bethesda | MD | Subcontractor |
| Clayford, LLC | Vienna | VA | Subcontractor |
| Clearesult Energetics LLC | Portland | OR | Subcontractor |
| Clearing Turn LLC | Monterey | CA | $0 |
| Clearpine Enterprises Inc. | Henderson | NV | $0 |
| Clear Point Group LLC | Phoenix | AZ | $0 |
| CLH Strategies And Solutions, LLC | Denver | CO | Subcontractor |
| Clinician-driven Quality Solutions LLC | Chandler | AZ | Subcontractor |
| Cloudredy LLC | Jacksonville Beach | FL | Subcontractor |
| Cluster Construction Consulting, LLC | Las Vegas | NV | Subcontractor |
| Coalition For The Homeless Of Houston/harris County | Houston | TX | $0 |
| Cogniplex Inc. | Glen Ellyn | IL | $0 |
| Cognitive Edge USA Inc. | Wilmington | DE | $0 |
| Coleman Consulting Group LLC | Baton Rouge | LA | Subcontractor |
| Collaborative Agile Solutions LLC | Xenia | OH | Subcontractor |
| Command Decisions LLC | Auburn | AL | Subcontractor |
| Commodore Consulting, LLC | Powder Springs | GA | $0 |
| Common Sense Solutions LLC | Falls Church | VA | $0 |
| Commonwealth Technology Associates, LLC | Fairfax | VA | Subcontractor |
| Communities Unlimited Inc. | Fayetteville | AR | Subcontractor |
| Community Advocacy Research & Evaluation Consulting Group, Inc. | Phoenix | AZ | Subcontractor |
| Community Oriented Correctional Health Services, Inc. | Walnut Creek | CA | $0 |
| Community Partners | Los Angeles | CA | $0 |
| Compass Evaluation And Consulting LLC | Pittsford | NY | Subcontractor |
| Compass Strategy Design LLC | Leesburg | VA | Subcontractor |
| Compass Strategy Solutions LLC | Chantilly | VA | Subcontractor |
| Compliance Partners Inc. | Saint Simons Island | GA | Subcontractor |
| Comprehensive Counseling Services PC | Newtown | PA | $0 |
| Comprehensive Safety Services, LLC | Richland | WA | Subcontractor |
| Computer Geeks | Woodbridge | VA | $0 |
| Concentrance Consulting Group, Inc. | Memphis | TN | $0 |
| Concept Systems Inc. | Ithaca | NY | $0 |
| Concinnate Solutions, LLC | Ashburn | VA | Subcontractor |
| Concordia Consulting, LLC | Gaithersburg | MD | $0 |
| Conference Solutions, LLC | Fairfax Station | VA | $0 |
| Connective Business Solution PLLC | Orlando | FL | $0 |
| Connstep, Inc. | Hartford | CT | $0 |
| Consiglieri Private Limited | Dhaka | | Subcontractor |
| Consortium Management Group, Inc. | Bedminster | NJ | Subcontractor |
| Construction Claim Specialists LLC | Kaneohe | HI | Subcontractor |
| Consultant Concierge Corp. | Las Vegas | NV | Subcontractor |
| Consultants For Change, Inc. | Silver Spring | MD | $0 |
| Contingency Partners International, LLC | Buda | TX | $0 |
| Contract Navigation Solutions, LLC | Xenia | OH | Subcontractor |
| Contrails Independent Consulting LLC | Dayton | OH | Subcontractor |
| Control Risks Group, L.L.C. | New York | NY | Subcontractor |
| Convergence Support Services LLC | Grasonville | MD | Subcontractor |
| Co. Pace The Leadership Guru, LLC | Cockeysville | MD | $0 |
| Coral Health Advisors LLC | Washington | DC | Subcontractor |
| Corentus Inc. | Arlington | MA | $0 |
| Corevision, LLC | Troy | VA | $0 |
| Coridan Corp. | Arlington | VA | $0 |
| Corporation For A Skilled Workforce | Hartland | MI | Subcontractor |
| Cotter Strategies LLC | Summit | NJ | $0 |
| Counter Terrorism Advanced Training Center LLC | Immokalee | FL | Subcontractor |
