- D Foster Consulting, LLC
- D Wheatley Enterprises Inc [DBA DWE Inc]
- D. C. DYNA, Inc.
- D.F. Perez Construction, Inc.
- D. Mabee Acquisition Consulting LLC
- D’Amore Enterprises Inc
- D’Vinci Interactive, Inc.
- D’vine Media Solutions LLC
- D&H Maintenance, Inc.
- Daico Industries, Inc.
- DAJ Consulting LLC
- DAK Resources Inc.
- Dakota Property Preservation & Home Improvement LLC
- Dalton Manufacturing Group, Inc
- Danbury Square Box Company, Inc.
- Dancoliz, Inc. [DBA Sir Speedy Prescott]
- DANS-K Medical Supplies, LLC
- Danto Builders, LLC
- Daphne Valcin Coaching, Inc.
- Dasilva Consulting LLC
- Data Diggers Screening, LLC
- DATA DOC, MD L.L.C.
- Data Machines Corp.
- Data Products LLC
- Data Technology Printed Circuits, Inc. [DBA Winonics]
- Data Vision Group, LLC
- DataPath, Inc.
- DATASYST Engineering & Testing Services, Inc.
- DataTel Network Services, LLC
- DataWise, Inc.
- DAV Energy Solutions
- David Taylor Construction, Inc.
- DAVINCIA, LLC
- Davis & Associates Transportation LLC
- Davis Designs And Technologies, LLC
- Davis Staffing, Inc.
- Dawnbreaker, Inc.
- Dayton T. Brown, Inc.
- DBG Apparel Limited Liability Company
- DBISP LLC
- DC Sparks Construction, LLC
- DC3 Therapeutics, LLC
- DDL Holdings LLC
- De La Fuente Construction Inc.
- DearGo, LLC [Aqua Periit]
- Decision Consultants Inc.
- Decor Unlimited LLC
- Dedicated Janitorial Services LLC
- Dedicated Tech Services, Inc.
- Deep Indigo Inc
- Deep Think, Inc.
- DefCon2 LLC
- Defense & Aerospace Manufacturing LLC
- DefenseTek Solutions, Ltd.
- Delany, Siegel, Zorn & Associates, Inc.
- Delaware Labor Resources, Inc. [DBA Delmarva Labor and Remediation]
- DelMar Aerospace Corporation
- Delmock Technologies, Inc.
- DelNovak LLC
- Delta Electronics, Inc.
- DeltaMed Supply, LLC
- Deltha Corporation
- DeMarco Transportation LLC
- Demorris Services, Inc
- Dennis Millican Associates Inc
- DeNOVO Solutions, LLC
- Dental Dynamic Staffing, LLC
- Dependable Global Solutions Inc.
- Deploy-Tech LLC
- DeployIT USA Inc
- DESERTCOMM,LLC
- Design Mojo, LLC
- DesignOvation Strategies LLC
- Designs For Vision, Inc.
- Deval LLC
- Development Services Group Inc
- DeWitt Consultancy Partners, LLC
- DGS Management Group, LLC
- Diagnostics Direct, LLC
- Diagnostics Technical Support, LLC
- Didava.com, LLC [TheOfficeSquad]
- Die-Mension Corporation
- Diele & Wood LLC
- Digifier, Inc
- Digital Capstone, Inc.
- Digital Interface Global IT Systems LLC
- Digital Machining, LLC
- Digital Plaza, LLC
- Digital Speech Systems Inc
- Digmshift Group, LLC
- Dijatek, LLC
- Dill and Company, LLC
- Dimensional Consulting, LLC
- DINPAK LLC
- Dion Marketing Company, Inc.
- Direct Medical Supplies, LLC
- Direct Traffic Solutions, Inc.
- DirectNET, Inc. [DBA 42U]
- DiscountCell, Inc.
- Display America, Inc.
- Disruptive Construction LLC
- disruptiveOps
- Distributed Information Technologies Inc.
- Divergent Alliance LLC
- Divers Supply, Inc
- Diverse Concepts Inc
- Diversified Systems Inc.
- Diversigroup LLC
- Divine Design & Marketing Inc.
- Dixie Machinery, Inc.
- DJ Business Solutions, LLC
- DJL Engineering Services PLLC [DBA Peregrine Engineering Consulting]
- DKNY, Inc. [DBA DKNY Locksmith]
- DL Stone Enterprises LLC
- DM Intelligence Security Solutions LLC
- DMC Management Services, LLC
- DMT Transport LLC
- DNT Environmental Services, Inc
- Dobbs Defense Solutions LLC
- DocIT Solutions, LLC
- Document Management Solutions Inc
- Doing Better Business, Inc.
- Dominion Entertainment Corporation
- Donatini, Inc.
- Doran Scales, Inc.
- Dorsey Uniforms
- Dottie Rose Consulting, LLC [DBA thedot. Consulting]
- Dougherty & Associates, Inc.
- Dow Hydraulic Systems, Inc.
- Downey Engineering Corporation
- DP Video Productions, LLC
- DPRA, Inc
- Dream Management, Inc.
- Driver Technology, LLC
- Drixle LLC
- Drumm Emergency Solutions, LLC
- DS Acquisition, LLC [DBA Vision Direct]
- Ds2 LLC
- DSN Global Ventures LLC
- DT Strategies, Inc.
- DTC Global Services LLC
- Dube Consulting
- Duct Doctor USA of Fairfax County, Inc
- Duran Construction
- Durr Capital Group, LLC
- Dymetrol Company, Inc.
- Dynamic Management Associates, LLC
- Dynamic Network Group, LLC
- Dynamic Networks, LLC
- Dynamic Security Concepts Inc
- Dynamic Technology Systems Inc
- Dynamo Technologies, LLC
- DZS Software Solutions Inc.