Platinum Level
- HDR
- Foothill Transit*
- Los Angeles County Metropolitan Transportation Authority (LA Metro)*
- San Francisco Municipal Transportation Agency (SFMTA)*
- Sound Transit*
- South Coast British Columbia Transportation Authority (TransLink)*
- WSP*
Gold Level
- AMTRAK*
- Ann Arbor Area Transportation Authority (The Ride)
- Capital Area Transportation Authority
- Capital Metropolitan Transportation Authority (Austin, TX)*
- Champaign-Urbana Mass Transit District*
- Hampton Roads Transit*
- Intercity Transit*
- Keolis
- King County Metro Transit*
- Massachusetts Bay Transportation Authority (MBTA)
- Metro Transit (Minneapolis)
- Metrolinx (GO Transit)
- Metropolitan Atlanta Rapid Transit Authority*
- Santa Clara Valley Transportation Authority (VTA)*
- Société de transport de Montréal (STM)
- Southern California Regional Rail Authority (Metrolink)
- Southeastern Pennsylvania Transportation Authority (SEPTA)
- TRC Companies, Inc
- Tri-County Metropolitan Transportation District of Oregon (TriMet)*
Silver Level
- Caltrain
- CDM Smith*
- Greater Cleveland Regional Transit Authority*
- Jacksonville Transportation Authority
- Lane Transit District
- Pinellas Suncoast Transit Authority*
- Regional Transportation Commission of Washoe County
- Rock Island County Metropolitan Mass Transit District (MetroLINK)
- San Francisco Bay Area Rapid Transit District (BART)*
- San Mateo County Transit District, SamTrans bus service*
- Santa Monica Big Blue Bus
- SYSTRA Consulting, Inc.
- Valley Metro
Bronze Level
- Clever Devices Ltd.
- Dallas Area Rapid Transit (DART)
- Honolulu Authority for Rapid Transportation (HART)
- Interurban Transit Partnership (The Rapid)
- Southwest Ohio Regional Transit Authority
- Stacy and Witbeck, Inc.
- Transit Authority of River City (TARC)*
- Utah Transit Authority*
- Wendel
Entry Level
- ABC Companies
- AC Transit
- AECOM*
- American Public Transportation Association
- Anil Verma Associates, Inc.
- BAE Systems, HybridDrive Solutions
- Ben Franklin Transit*
- BYD Motors, Inc.
- California High-Speed Rail Authority
- Chapel Hill Transit*
- Chatham Area Transit Authority/Veolia Transportation
- Chicago Transit Authority
- City of Rock Hill
- Commonwealth Office of Transit Authority
- Connecticut Department of Transportation
- Corpus Christi Regional Transportation Authority
- Eastern Contra Costa Transit Authority
- Gannett Fleming, Inc.
- GENFARE
- Go Triangle*
- Golden Empire Transit District
- Greater Bridgeport Transit Authority*
- Greater Peoria Mass Transit District*
- Greystone Management Solutions
- Hillsborough Area Regional Transportation Authority
- Indianapolis Public Transportation Corporation (IndyGo)*
- INIT Innovations in Transportation Inc.
- Jacobs
- Kansas City Area Transportation Authority
- Kitsap Transit
- Knoxville Area Transit (KAT)
- Latinos in Transit
- Lea+Elliott, Inc.*
- Legacy Resource Group
- Long Beach Transit
- Maryland Transit Administration
- MBTA
- MTM Transit
- METRO Regional Transit Authority (Akron, OH)
- Metropolitan Transportation Authority*
- Miami-Dade Transit
- Michael Baker International
- Minnesota Valley Transit Authority
- Monterey-Salinas Transit
- Mountain Line
- Mountain Metropolitan Transit (Mountain METRO)*
- NextBus, Inc.
- NFI Group
- NJ TRANSIT*
- North County Transit District
- NS Wash Systems
- Olivier, Inc.
- OmniTrans
- Orange County Transportation Authority
- Parsons
- Pierce Transit
- Pittsburgh Regional Transit
- Proterra Inc.*
- Raul V. Bravo + Associates, Inc.
- Regional Transportation Authority (Chicago)
- Regional Transportation Commission of Southern Nevada
- Regional Transportation District (Denver)
- Sacramento Regional Transit District
- Salem Area Mass Transit District
- SanUVAire, LLC
- SNC_Lavalin Rail & Transit
- Stadler US Inc.
- Stantec
- The Solís Group
- Toledo Area Regional Transit Authority
- Transit Marketing Group (TransMark)
- Transit Systems Engineering, Inc.
- Umass Transit Service
- Unitrans (UC Davis)
- Urban Engineers
- VHB
- VIA Metropolitan Transit*
- Washington Metropolitan Area Transit Authority (WMATA)
- Whatcom Transportation Authority
- Yuma County Intergovernmental PTA
* Founding Signatory of APTA Sustainability Commitment
Last updated: August 23, 2023
