| Comcast Business Communications, LLC | 15 | $738K | Department of Veterans Affairs |
| Comcast Cable Communications, LLC | 27 | $2.1M | Department of the Air Force |
| Comcast Government Services LLC | 341 | $22M | Defense Information Systems Agency |
| Comcast of Connecticut, Inc | 20 | $140K | Department of the Navy |
| Comercio Y Representaciones, S.a. de C.v. | 3 | $156K | Department of State |
| Comet Flasher Inc | 3 | $70K | NY State Authorities |
| Comet Rail LLC | 6 | $273K | MTA Procurements |
| Cometto S.p.a. | 23 | $434K | Department of the Navy |
| Comfort Cushion Products, Inc. | 27 | $198K | Defense Logistics Agency |
| Comfort Dynamics, Inc | 3 | $158K | San Francisco |
| Command Construction Industries LLC | 4 | $9.4M | City-Parish of Baton Rouge |
| Command Control Communications Engineering & Logistics LLC | 8 | $3.0M | U.S. Coast Guard |
| Command Cyber Solutions LLC | 5 | $34M | Department of the Air Force |
| Command Management Services, Inc. | 50 | $58M | Department of the Army |
| Command Performance Constructors Inc | 5 | $4.2M | Department of the Navy |
| Commander | 5 | $50K | Department of the Navy |
| Commanders Concepts Commissioning LLC | 4 | $165K | Department of Veterans Affairs |
| Commanding Officer | 3 | $5.0M | Department of the Army |
| Commandtec, LLC | 3 | $2.7M | Department of the Army |
| Commdex, LLC | 15 | $50M | Department of the Navy |
| Commemorative Air Force | 80 | $1.8M | Department of the Air Force |
| Commerce Packaging Corp. | 6 | $918K | Department of the Army |
| Commerce Rentals LLC | 8 | $264K | Department of the Army |
| Commercial Blue Inc | 3 | $605K | U.S. Coast Guard |
| Commercial Business Furniture | 13 | $11K | Oregon State Treasury |
| Commercial Cleaning NY Sunshine Inc. | 5 | $202K | NY State Authorities |
| Commercial Coating Company Inc. | 5 | $110K | City of Los Angeles Controller |
| Commercial Computer Services Inc | 7 | $69K | Department of the Navy |
| Commercial Connect Television Inc | 3 | $192K | Department of Veterans Affairs |
| Commercial Contracting Corp | 3 | $49M | Department of the Army |
| Commercial Contracting Enterprise, Inc | 33 | $219K | Defense Logistics Agency |
| Commercial Driver Training Inc | 5 | $6.9M | MTA Procurements |
| Commercial Facilities Management Inc | 6 | $132K | Public Buildings Service |
| Commercial Freight Services, Inc. | 3 | $67K | Department of State |
| Commercial Interiors, Inc. | 3 | $472K | Department of the Air Force |
| Commercial Lubricants Moove Corp | 24 | $3.7M | MTA Procurements |
| Commercial Lynks, Inc | 3 | $1.1M | Agricultural Marketing Service |
| Commercial Parts & Service of Columbus, Ohio, Inc. | 119 | $401K | Defense Logistics Agency |
| Commercial Programming Systems Inc | 9 | $97K | City of Los Angeles Controller |
| Commercial Service of Bloomington, Inc. | 7 | $69K | Department of the Navy |
| Commercial Window Repair Solutions Inc. | 4 | $808K | Department of Veterans Affairs |
| Commit Enterprises Inc | 4 | $88M | Department of the Navy |
| Commodore Maintenance Corp. | 13 | $412M | MTA Procurements |
| Common Ground Management Corp | 23 | $1.3B | New York City |
| Commonpoint NY Inc | 21 | $49M | New York City |
| Commonwealth Clinical Group Inc | 3 | $60K | Federal Prison System / Bureau of Prisons |
| Commonwealth Healthcare Corporation | 3 | $29K | Social Security Administration |
| Commonwealth Heritage Group, Inc. | 5 | $233K | Department of the Army |
| Commonwealth Home Health Care, Inc. | 38 | $33M | Department of Veterans Affairs |
| Commonwealth Scientific and Industrial Research Organisation | 6 | $4.7M | Department of the Army |
| Commonwealth Strategic Solutions, LLC | 16 | $45M | Department of Veterans Affairs |
| Commonwealth Trading Partners Inc | 6 | $34M | Department of State |
| Commonwealth Utilities Corporation | 4 | $410K | Department of the Navy |
| Commserv Ltd | 18 | $455K | Department of State |
| Communicare Technology Inc | 3 | $115K | City-Parish of Baton Rouge |
| Communicate Better | 3 | $75K | New York City |
| Communication Access Partners | 8 | $2K | State of Delaware |
| Communication Institute International, Inc | 37 | $6.1M | Office of Administrative Services |
| Communication Logic LLC | 6 | $229K | Department of the Air Force |
| Communication Methods, LLC | 11 | $58M | Defense Commissary Agency |
| Communications & Ear Protection, Inc | 18 | $1.1M | Defense Logistics Agency |
| Communications & Power Industries LLC | 52 | $16M | Defense Logistics Agency |
| Communications & Power Industries Canada Inc. | 3 | $5.2M | Department of the Navy |
| Communications Engineering Company | 3 | $1.8M | Department of Veterans Affairs |
| Communications International Inc | 6 | $1.3M | Department of the Navy |
| Communications Professionals Inc. | 85 | $3.1M | Department of the Navy |
| Communications Resource Inc | 4 | $601K | Court Services and Offender Supervision Agency |
| Communications Scientific International, Incorporated | 24 | $10K | Defense Logistics Agency |
| Communications Supply Corporation | 18 | $2.1M | Department of the Navy |
| Communications Training Analysis Corporation | 3 | $556K | NY State Authorities |
| Community Access Inc. | 4 | $6.3M | New York City |
| Community Action Partnership | 6 | $7K | City-Parish of Baton Rouge |
| Community Agency for Senior Citizens Inc | 13 | $25M | New York City |
| Community Animal Medicine Project Inc | 7 | $76K | City of Los Angeles Controller |
| Community Assessment and Treatment Services, Inc. | 3 | $111K | Federal Prison System / Bureau of Prisons |
| Community Assistance Programs | 8 | $1.9M | City of Chicago |
| Community Association of Progressive Dominicans | 10 | $25M | New York City |
| Community at Work | 7 | $446K | San Francisco |
| Community Blood Center | 6 | $11M | Department of the Army |
| Community Blood Center of the Ozarks | 3 | $214K | Department of Veterans Affairs |
| Community Bridges, Inc | 7 | $484K | Indian Health Service |
| Community Builders Inc | 5 | $13M | City of Chicago |
| Community Care Center of Thibodaux, LLC | 4 | $384K | Department of Veterans Affairs |
| Community Coach Inc | 10 | $16M | MTA Procurements |
| Community Coffee Company LLC | 8 | $10K | City-Parish of Baton Rouge |
| Community Corrections Association, Inc. | 9 | $5.4M | Federal Prison System / Bureau of Prisons |
| Community Development Institute | 8 | $69M | City of Chicago |
| Community Education Centers, Inc. | 9 | $8.7M | Federal Prison System / Bureau of Prisons |
| Community Education Network DBA It Takes a Village Family of Schools | 11 | $5.7M | City of Chicago |
| Community Electric, Inc. | 6 | $1.4M | NY State Authorities |
| Community Extended Nuclear Transition Residence for Ex-Offenders, Inc. | 19 | $15M | Federal Prison System / Bureau of Prisons |
| Community Forward SF | 7 | $55M | San Francisco |
| Community Health Action Of Staten Island, Inc. | 3 | $3.2M | New York City |
| Community Housing Innovations Inc | 5 | $324M | New York City |
| Community Housing Partnership | 6 | $6.1M | San Francisco |
| Community Initiatives | 16 | $15M | San Francisco |
| The Community Initiatives of NC | 5 | $2.0M | New York City |
| Community Investment Corporation | 3 | $20M | City of Chicago |
| Community Investment Corp 01 | 5 | $283K | City of Chicago |
| Community League of the Heights, Inc. | 4 | $7.2M | New York City |