Mercator’s past and current clients include:
- Airports Council International – North America (ACI-NA)
- American Association of State Highway and Transportation Officials (AASHTO)
- American Public Transportation Association (APTA)
- Delaware River Waterfront Corporation
- District of Columbia Department of Transportation (DDOT)
- Federal Aviation Administration (FAA)
- Federal Highway Administration (FHWA)
- Gateway Cities (CA) Council of Governments
- Holt Logistics Corporation
- Los Angeles County Metropolitan Transportation Authority
- Metropolitan Washington Airports Authority (MWAA)
- Pennsylvania Turnpike Commission (PTC)
- Regional Plan Association
- Transportation Research Board
- Transportation Security Administration (TSA)
- Virginia Department of Transportation (VDOT)