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- Koegel Associates Inc
- Koehn & Assoc
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- KOMP Engineering
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- Kramer Land Design Studio
- Krause Inc
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- Krech & Ojard Consulting
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- L & E Engineering Inc
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- L B Industrial Systems
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- L M Swayze Engineers
- L Z Technology Inc
- Laboratory Of Engineers Evltn
- Lachel & Assoc Inc
- Ladd Engineering Assoc Inc
- Laidlaw Group LTD
- Lake Country Engineering Inc
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- Lamb & Barger Consltng Engr
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- Lampe Consulting
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- Land Development Consultants
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- Land Tech Engineering
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- Lang Associates
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- Lanier & Assoc
- Laplace Technologies Inc
- Larry Blackmon Inc
- Larry Russell & Assoc
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- Larson-Binkley Inc
- Latimer Companies
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- Lawrence A Cates & Assoc
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- Lawrence E Hans & Assoc
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- Lawrence Peeler
- Lazaris Engineering Inc
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- LBG-Guyton Assoc
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- Lea & Elliott
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- Lentz Engineering Inc
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- Leslie D Bond PE
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- Letchford Norville Schroeder
- Letchford Norville Schroeder
- Lewis Engineering
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- Lightridge Resources
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- Lim & Assoc Inc
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- Lin Engineering
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- Lineberger Consulting Engineer
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- Lingle Engineers
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- Lloyd Engineering Inc
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- Loadmaster
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- Lockwood Anderews Newnam Inc
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- Lockwood Engineers Inc
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- Long Consultants
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- Lott & Brown Consulting Eng
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- Louis Berger & Assoc
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- Lowe Offshore Inc
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- Lt Hawthorne & Co
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- Lubenow Gobster Dominiak Inc
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- M D Engineering LP
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- M J Engineering
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- Mac Donald Dettwiler Robotics
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- Macina Bose Copeland & Assoc
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- Maestas & Bailey Inc
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- Magnum Engineering
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- Malcolm Pirnie Inc
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- Malone Wheeler
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- Manoussoff Associates
- Marathon Engineers Architects
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- Master Corp
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- Maverick Engineering
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- Mavis Jack Green Pro Engr Inc
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- Max Engineering
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- Mc Donough Engineering Corp
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