- City of Baltimore
- Office of the Mayor
- Cleaner Greener Baltimore
- Energy Star
- U.S. Green Building Council
- Commission on Sustainability posts letter regarding Grand Prix tress
- 1000 Friends of Maryland
- Altcar
- Amtrak
- Art Blocks
- B-more Mobile
- Baltimore Area Convention and Visitors Association
- Baltimore Biodiesel Coop
- Baltimore Business Journal
- Baltimore City Commission for Historical & Architectural Preservation
- Baltimore City Community College
- Baltimore City Department of General Services
- Baltimore City Department of Health
- Baltimore City Department of Housing and Community Development
- Baltimore City Department of Planning
- Baltimore City Department of Public Works
- Baltimore City Department of Public Works: Bureau of Water and Wastewater
- Baltimore City Department of Recreation and Parks
- Baltimore City Department of Transportation
- Baltimore City Fire Department
- Baltimore City Food Policy Task Force
- Baltimore City Health Department
- Baltimore City Mayors Office of Employment Development:
- Baltimore City Parking Authority
- Baltimore CIty Public School System
- Baltimore County Environmental Protection
- Baltimore Development Corporation
- Baltimore Development Corporation's Brownfields Program
- Baltimore Ecosystem Study
- Baltimore Energy Challenge
- Baltimore Free Store
- Baltimore Gas & Electric
- Baltimore Green Currency Association
- Baltimore Green Map
- Baltimore Green Space
- Baltimore Green Works
- Baltimore Metropolitan Council
- Baltimore Neighborhood Energy Challenge
- Baltimore Neighborhood Indicators Alliance
- Baltimore Office of Promotion & the Arts
- Baltimore Running Festival
- Baltimore County Watershed Association
- Baltimore Water Alliance
- Baltimore Workforce Investment Board
- Bike Baltimore
- Bike Maryland
- Biohabitats
- Blue Water Baltimore
- Cdm eCycling
- Central Maryland Transportation Alliance
- Chesapeake Bay Foundation
- Chesapeake Bay Trust
- Chesapeake Sustainable Business Alliance
- Children in Nature Network
- City Bizlist
- Civic Works
- Civic Works Real Food Farm
- CleanerGreener Baltimore Initiative
- Coalition to End Childhood Lead Poisoning
- College of Notre Dame
- Community Greening Resource Network
- Construction and Energy Technologies Education Consortium
- Constellation Energy
- Coppin State College
- CSX Corporation
- Eco-check
- EnviroEducation
- Friends of Patterson Park
- Green Building Institute
- Green and Healthy Homes
- GreenJobs Network
- Healthy Harbor Initiative
- Holistic Life Foundation
- Housing and Transportation Affordability Index
- Irvine Nature Center
- Johns Hopkins Center for a Livable Future
- Johns Hopkins Sustainability Office
- Johns Hopkins University
- Johns Hopkins ZipCar
- Living Classrooms
- Maryland Association for Environmental and Outdoor Education
- Maryland Department of Agriculture
- Maryland Department of the Environment
- Maryland Department of Natural Resources
- Maryland Energy Administration
- Maryland Green Registry
- Maryland Hospitals for a Healthy Environment
- Maryland Hunger Solutions
- Maryland Master Gardeners
- Maryland Native Plant Society
- Maryland Pesticide Network
- Maryland Port Authority
- Maryland Sierra Club
- Maryland Transit Authority
- Morgan State University
- Masonville Cove Environmental Education Center
- National Vacant Properties Campaign
- Neighborhood Design Center
- Northeast Maryland Waste Disposal Authority
- Parks and People Foundation
- Rebuilding Together
- Second Chance
- Sojourner-Douglas College
- Terracycle
- The Council of Teachers for the Environment Group
- The Loading Dock
- Transit Riders Action Council
- TreeBaltimore
- Under Armour
- Urban Agriculture Task Force
- US Green Building Council - Maryland
- Walkscore
- Waste Neutral Group
- Waterfront Partnership of Baltimore
- Youthworks
- Zipcar