- KTA-Tator
- Kubat Consulting
- Kubick
- Kubick
- Kuegler Associates
- Kuhlmann Design Group
- Kurtz Consulting
- Kurtz Diversified Svc
- L & B Engineering Consultants
- L A Batchelder & Sons
- L C Assoc Inc
- L Cubed Consulting Inc
- L F Inc
- L G Wolff Assoc
- L R Nelson Consulting Engrs
- L Robert Kimball & Assoc Inc
- L S Agnew Jr PE
- L S Engineers
- L S Grim Consulting Engineers
- L-3 Communications Titan Group
- L-3 Communications Titan Group
- L-3 Communications Titan Group
- L-3 Communications Titan Group
- L-3 Communications Titan Group
- Lake Development Systems Inc
- Lake Superior Consulting
- Lakeside Consulting
- Lakeside Engineering
- Lakin Inc
- Lambert Consulting
- Lambert Engineering & Srvyng
- Lambert Utility Consulting
- Land America Assessment Corp
- Land Engineering
- Land Plan Assoc
- Land Solutions
- Landmark Engineering
- Landteam Inc
- Lane Engineering
- Langan Environmental Svc
- Langer Associates Inc
- Lanning Engineering Co Inc
- Larchmont Engineering
- Larkin Engineering
- Larkin Group
- Larry G Earp & Assoc
- Larry Hill Consulting Inc
- Larson Associates Inc
- Lash Engineering
- Latitude Engineering-Surveying
- Lau Ra Tech
- Laurentian Engineering Group
- Lawrence A Ortega & Assoc
- Lawrence M Prater PE
- Leach Wallace Assoc Inc
- Lee Consulting
- Lee T Purcell Assoc
- Leigh Consulting Svc
- Lemke Engineering Svc
- Lemmert Consulting Inc
- Lemmert Consulting Inc
- Leo A Daly
- Leon Avakian Inc
- Leonard Silver & Assoc Inc
- Leonardo Technologies
- Lepene Engineering
- LEW Inc With Lowthian Design
- Lewis Moore Inc
- Lewis-Bade Inc
- LGA Engineering
- LGB Assoc LLC
- LHA Engineering
- Licata Consulting
- Lidington Technologies LLC
- Lieberman & Walisko
- Life Cycle Engineering Assoc
- Light Works Inc
- Lighthouse Engineering
- Lindale Consulting Inc
- Lindale Consulting Inc
- Linden Technical Svc
- Lindgren & Sharples
- Lindner Consulting Svc
- Link Technologies
- Linquest Corp
- Linric Co
- Linwood C Scott Jr Inc
- Lipizzi & Assoc
- Lippincott Engineering Assocs
- List USA Inc
- Liston Consulting Engineers
- Litigation Metrics Inc
- Litwornia Associates Inc
- Litzinger & Co Engineers
- Livingston Associates
- LKU Group Inc
- LLA Assoc
- LME Inc
- LMS Land Mgmt & Environmentl
- LMW Engineering Group LLC
- Lockwood Greene Engineers Inc
- Lofquist & Assoc Inc
- Loftus Co
- Logan Crop Consulting Inc
- Logicon
- Lohmueller & Assoc
- Loiederman Associates
- Loiederman Soltesz Assoc
- Loiederman Soltesz Assoc
- Loiederman Soltez Assoc
- Loiederman Soltez Assoc
- Lombardo & Assoc
- Lombardo & Assoc
- Lonergan Engineering & Cnsltng
- Lord Worrell & Richter
- Lortech Inc
- Los Alamos Technical Assoc
- Los Alamos Technical Assoc
- Louis Berger & Assoc
- Louis Berger Group
- Louis J Manfredi Consulting
- Louis M Tozzi Consultants Inc
- Louis T Cerny PE
- Lounge Consulting
- Loureiro Engineering Assoc Inc
- Loureiro Engineering Assoc Inc
- Lous Berger Group Inc
- Loyalty Factor
- LPA Group
- LPA Group Inc
- LSE Inc
- LTPP Material Reference Lib
- Lubin Consulting Inc
- Lucas Engineering Svc
- Luciano Packaging Technologies
- Lugmayer Associates
- Lundberg Engineering
- Lundy Fire Protection Cnsltng
- Luongo Associates
- Luppes Consulting Inc
- Lutjen Inc
- LWG Consulting Inc
- Lydick Engineers & Surveyors
- M & A Assoc Inc
- M & E Engineering Inc
- M & E Engineers Inc
- M & T Co
- M A Bielski & Assoc
- M A Colvin Engineering Inc
- M A Engineering
- M B Engineering Co
- M B Technical Svc Inc
- M C Assoc
- M C Technologies Inc
- M E Group
- M E Thompson Jr Real Estate
- M H Berg & ASSOC LLC
- M J Consulting Inc
- M L Dee & Assoc Inc
- M P Assoc
- M Paradowski
- M R Innoveers
- M R Innoveers LLC
- M S Consultants Inc
- M S Engineers Inc
- M S Gertner & Assoc Inc
- M Technology
- M V Engineering Inc
- M V Ordnance Industries
- M-Tel Corp
- Mabbett & Assoc
- Mac Connell & Assoc
- Mac Lean Consulting
- Mac Millan Assoc Inc
- Mac Ritchie Engineering Inc
- Mack Communications LLC
- Mactac
- Mactec
- Mactec
- Mactec
- Mactec
- Mactec
- Mactec
- Mactec
- Mactec
- Mactec
- Maden Tech Consulting Inc
- Mafi Associates
- Magee & Assoc Inc
- Magnify Research Inc
- Magnolia Engineering Group
- Magothy Environmental Svc
- Mainware
- Maitra Associates PC
- Malcolm E Austin & Assoc
- Mallan Associates
- Mandala Services
- Mandex
- Maniktala Associates
- Manor's Consulting
- Manor's Consulting
- Mansell Associates Inc
- Mansell Associates Inc
- Mantaro Networks
- Manufacturing & Technology
- Marathon Engineering
- Marian M Di Stasio
- Marine Acoustics Inc
- Mario Labot Corp
- Marisystems Inc
- Mark B Boyd Inc
- Mark International Inc
- Mark R Cipolone
- Market Wise Mn
- Markstar Consultants
- Maroju Enterprises Inc
- Maroju Enterprises Inc
- Marsh Surveying Inc
- Marsh Surveying Inc
- Marshall F Parsons PE
- Martin Engineering
- Martin Pevzner Engineering
- Marvin & Assoc
- Marvin Oosterbaan PE
- Mary Ann Winter & Assoc
- Maryville Technologies
- Maser Consulting
- Masini Enterprises
- Masini Enterprises
- Mason-Grant Co
- Masterpiece Engineering Inc
- Material Selection Resources
- Matrix Consulting Group
- Matrix Consulting Group
- Matrix Engineering Inc
- Matrix Metal Products
- Matryxx Corp
- Matthews UMDNJ-Rwj
- Mattson Engineering
- Maverick Technologies
- MAXIEG
- Maximize Engineering Co
- Maxwell T Huff
- Mayo Lynch & Assoc Inc
- MBA Sales & Marketing Corp
- Mc Cabe & Assoc Inc
- Mc Cabe Associates Consulting
- Mc Cain Special Project Svc
- Mc Carthy Mechanical Inc
- Mc Caul Mc Caul & Assoc
- Mc Cleer Mc Cleer & Mc Cleer
- Mc Collum Consulting Inc
- Mc Cormick Taylor & Assoc Inc
- Mc Cracken & Lopez
- Mc Crone Inc
- Mc Crone Inc
- Mc Donald & Warger Inc
- Mc Donough & Rea Assoc Inc
- Mc Donough-Rea Assoc
- Mc Dowell & Assoc
- Mc Dowell Consulting Engineers
- Mc Fadyen/O'Briant Consulting
- Mc Farland-Johnson Inc
- Mc Ghie & Betts Inc
- Mc Kee Engineering
- Mc Kim & Creed Engineers
- Mc Kim & Creed Engineers Pa
- Mc Kittrick Engineering
- Mc Laren Engineering Group
- Mc Phail Associates Inc
- Mcl Engineers
- MDH Consulting
- MDI Inc
- Mead & Hunt
- Mead & Hunt Inc
- Meadex Technologies Inc
- MEC Consulting
- MEC Consulting
- Mechanical & Electrical System
- Mechanical Electrical Design
- Mechanical Engineering Svc
- Mechanical Solutions Inc
- Mechanical Support Eng Inc
- Mechanical Systems Design Inc
- Meco Engineering Co
- Med Serv
- Medairos Engineers Inc
- Medcon
- Medevelop Consulting Inc
- Medhorizons Consulting Group
- Medical Consulting Svc
- Medical Consulting Svc
- Medical Diagnoses Explained
- Medicept
- Medina Consultants
- Meeting Concepts
- MEH Consulting Engineers Inc
- Melick-Tully & Assocs PC
- MEM Engineering
- Mena Enterprises Inc