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- Louis Berger Group, Inc.
Albany, New York City, Rye
- Bergmann Associates
Albany, Buffalo, Elmira, Rochester
- Black & Veatch
Hauppauge, New York City, Tarrytown
- Blasland, Bouck & Lee, Inc.
Many locations
- Booz Allen Hamilton Inc.
New York City, Rome
- Brown and Caldwell
East Syracuse
- Bryant Associates, Inc.
Syracuse
- CALIBRE Systems, Inc.
West Point
- Cambridge Systematics, Inc.
New York City
- Cameron-Cole, LLC
Pleasantville
- Carter & Burgess Inc.
New York City
- CDM
Latham, Massena, New York City, Syracuse, Woodbury
- CH2M Hill
New York City
- Chazen Companies
Glens Falls, Newburgh, Poughkeepsie, Troy
- Clean Harbors, Inc.
East Syracuse, Glenmont, Newburgh
- Clough, Harbour & Associates LLP
Albany, Buffalo, Goshen, Melville,
New York City, Rochester, Syracuse
- Collins Engineers, Inc.
East Greenbush
- Columbia Analytical Services, Inc.
Hopewell Junction, Rochester
- Conestoga - Rovers & Associates
Buffalo, Depew,Niagara Falls, Rochester
- Ira D. Conklin & Sons, Inc.
Newburgh, Syracuse
- C & S Companies
Binghamton, Buffalo, Rochester
- CTE
New York City
- CWS, Inc.
Mayville
- Delta Environmental Consultants, Inc.
Armonk, Clifton Park, Syracuse
- Devine Tarbell & Associates, Inc.
Syracuse
- Dewberry
New York City, Rochester
- DMJM Harris
New York City
- Dvirka and Bartilucci Consulting Engineers
East Syracuse, White Plains, Woodbury
- New York State Companies: E - H, I - P, Q - Z.
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