- ABC Forest Management
- Acres, Inc.
- American Indian Council Inc.
- American Society of Landscape Architects - Indiana Chapter
- American Tree Farm System
- Amos W. Butler Audubon Society
- Anderson Parks & Recreation Department
- Anderson Wood Products
- Arbor Terra Consulting
- Arrow Head Country RC&D
- Ball State Center for Economic and Community Development
- Bernardin, Lochmueller & Associates, Inc.
- Bloomington Parks and Recreation Department
- C.S. Bond Forest Management
- Carmel City Planning
- Carmel Urban Forestry Committee
- CC Cook & Son Lumber Co
- Center for Urban Policy and the Environment
- Central Indiana Clean Cities Alliance
- Central Indiana Community Foundation (Efroymson Family Fund)
- Central Indiana Fur Takers
- Central Indiana Land Trust
- Chicago Wilderness
- City of Fort Wayne Parks & Recreation
- City of Indianapolis
- City of Indianapolis Office of Sustainability
- City of Madison - Engineering Division
- City of Marion - Engineering Division
- City of Muncie - Parks Department
- City of Terre Haute - Engineering
- City of West Lafayette
- Clear Lake Township Land Conservancy, Inc.
- Columbus Department of Parks & Recreation
- Crooked Creek Gun & Conservation Club
- Danzer Forestland
- Davison H.Q.S., Inc.
- Decatur Department of Parks & Recreation
- DJ Case and Associates
- DNR - Division of Forestry
- DNR - Division of Reclamation
- DNR - Division of State Parks & Reservoirs
- Doll Forestry Consulting, LLC
- Drake University
- Ducks Unlimited
- Duke Energy
- Dwyer Forestry Consulting
- Earth Source Inc. and Heartland Restoration Services
- Eco Logic, LLC
- Environmental Education Association of Indiana
- Evansville Department of Parks & Cultural Resources
- Foley Hardwoods
- Forest and Wildlife Services
- Forest Management Services, Inc.
- Forest Resource Consultants Inc.
- Fort Wayne Board of Public Works
- Fort Wayne Department of Parks & Recreation
- Four Rivers RC&D
- Frank Miller Lumber
- Friends of Yellowwood
- Gandy's Timber Management
- Gilbert Arborcare, LLC
- Goshen Parks
- Greendale Park Board
- Greenways Foundation
- Gregg Forest Services
- Haubry Forestry Consulting, Inc.
- Heartland Forestry, LLC
- Heartwood
- Hefner Timber LLC
- Historic Hoosier Hills RC&D
- Historic Landmarks Foundation of Indiana
- Hoosier Chapter Soil & Water Conservation Society
- Hoosier Heartland RC&D
- Hoosier Hikers Council
- Hudson Forestry
- IDEM - Office of Air Quality
- IDEM - Watershed Group
- IDNR - Division of Entomology & Plant Pathology
- IDNR - Division of Fish & Wildlife
- IDNR - Heritage Trust & Foundation
- IDNR - Historic Preservation & Archeology
- IDNR - Nature Preserves
- IDNR - Nature Preserves - Natural Heritage Program
- IDNR - Oil & Gas
- IDNR - Outdoor Recreation
- IDNR - State Parks & Reservoirs
- IDNR - Water
- Indiana Academy of Science
- Indiana Architectural Plywood
- Indiana Association for Floodplain and Stormwater Management
- Indiana Association of Cities and Towns
- Indiana Association of Realtors
- Indiana Association of Consultant Foresters
- Indiana Association of Soil and Water Conservation Districts, Inc.
- Indiana Audubon Society, Inc.
- Indiana Beef Council
- Indiana Biodiversity Initiative
- Indiana Builders Association
- Indiana Chapter of the American Fisheries Society
- Indiana Chapter of the Wildlife Society
- Indiana Conservation Alliance
- Indiana Department of Transportation - Environmental Services
- Indiana Environmental Health Association
- Indiana Farm Bureau, Inc.
- Indiana Farm Bureau, Inc. - Agricultural Development and Natural Resources
- Indiana Forest Alliance
- Indiana Forestry and Woodland Owners Association
- Indiana Forest Industries Council
- Indiana Forest Stewardship Advisory Council
- Indiana Hardwood Specialists, Inc.
- Indiana Karst Conservancy
- Indiana Lake Management Society
- Indiana Land Use Consortium
- Indiana Maple Syrup Association
- Indiana Native American Indian Affairs Commission
- Indiana Native Plant and Wildflower Society
- Indiana Native Plant and Wildflower Society (Spence Nursery)
- Indiana Natural Resources Foundation
- Indiana Nursery and Landscape Association
- Indiana Parks and Rec. Association
- Indiana Planning Association
- Indiana Quail Unlimited
- Indiana Rural Development Council
- Indiana Society of American Foresters
- Indiana Sportsmen's Roundtable
- Indiana State Board of Animal Health
- Indiana State Department of Agriculture
- Indiana State Technical Committee (USDA, NRCS)
- Indiana State Trappers Association
- Indiana State University
- Indiana University
- Indiana University Bloomington
- Indiana University School of Public and Environmental Affairs
- Indiana Urban Forest Council
- Indiana Wild Turkey Federation
- Indiana Wildlife Federation
- Indianapolis Parks Dept.
- Indianapolis Parks Foundation
- Indy Parks & Recreation
- IPL
- ISDA - Division of Soil Conservation
- ISDA - Hardwoods Program
- IUPUI Center for Earth and the Environment
- IUPUI Center for Urban Policy and the Environment
- Jasper Seating Co.
- JFNew
- JPG Heritage Partnership
- Keep Indianapolis Beautiful
- Kimball International
- Koetter Woodworking
- Krecik Consulting Forestry Services
- Lafayette Department of Parks & Recreation
- Land Use Consultants
- LaPort Parks Department
- LaPorte County Conservation Trust
- Lincoln Hills RC&D
- MacBeath Hardwood Co.
- Maley & Wertz, Inc.
- Marian College
- Mayer Forestry and Forest Product Services
- Meisberger Woodland Management
- Metropolitan Indianapolis Board of Realtors
- Miami Nation of Indiana
- Michigan City Division of Parks & Recreation
- Midwest Natural Resources Group
- Miller Custom Hardwoods, Inc.
- Midwest Invasive Plant Network
- Mishawaka Department of Parks & Recreation
- Missouri Botanical Garden
- Monroe County Commissioners
- Monroe County Parks & Rec. Dept.
- Moser Woodland Services
- Mud Creek Conservancy
- Multi-Resource Management, Inc.
- Nelson's Consultant Forestry
- NICHES Land Trust
- Nina Mason Pulliam Charitable Trust
- Noblesville Street Department
- North Slope Forestry
- Northwest Indiana Regional Planning Commission
- Northwest Territory RC&D
- Oak Heritage Conservancy
- Oak Heritage Conservancy
- Office of Senator Lugar
- OFS Brands
- Peladeau Lumber
- Pike Lumber Co.
- Pingleton Sawmill
- Potawatomi Audubon Society
- Professional Forestry Service
- Protect Our Woods
- Purdue Center for Regional Development
- Purdue University - Green Infrastructure Module
- Purdue University Cooperative Extension Service
- Purdue University Department of Entomology
- Purdue University Department of Forestry and Natural Resources
- Purdue University Grounds
- Red-tail Conservancy
- Remenschneider Associates, Inc.
- Ron Dixon Natural Resources Consulting
- Sassafras Audubon Society, Inc.
- Schuerman Forestry
- SER Midwest-Great Lakes Chapter (ENVIRON International Corporation)
- SER Midwest-Great Lakes Chapter (USDA-ARS Soil Drainage Research Unit)
- Sierra Club Indiana Chapter
- South Bend Department of Parks and Recreation
- Southeast Purdue Agricultural Center
- Southern Indiana Community Weed Management Area
- Southern Indiana-Purdue Agricultural Center
- Spence Restoration Nursery
- Stambaugh Forestry
- Steele Forestry Consulting
- Stemwood Corp.
- Swackhamer's Forestry Service
- Sycamore Trails RC&D
- Syracuse City Parks
- The Hardwood Forestry Fund
- The Hoosier Environmental Council
- The Indiana Hardwood Lumbermen’s Association
- The Nature Conservancy - Indiana
- The Shirley Heinze Land Trust
- The Wildcat Creek Foundation, Inc.
- Three Valley Conservation Trust
- Timber Sales and Management
- Timber Steward
- Tippecanoe Co. Parks & Rec.
- TNC Indiana - Blue River Project Office
- TNC Indiana - Brown County Hills Project Office
- Tree, Inc.
- Trees Indiana
- Turner Forestry, Incorporated
- U.S. Fish & Wildlife Service
- U.S. Office of Surface Mining Reclamation and Enforcement
- University of Indianapolis
- University of Notre Dame Center for Aquatic Conservation
- US Fish & Wildlife - Private Lands Office
- US Forest Service
- US Senate & House of Representatives
- USDA Natural Resources Conservation Service (NRCS)
- USGS - Indiana Water Science Center
- Valley Watch (Sierra Club Indiana Chapter)
- Veneer Services
- Vigo County Parks Department
- Wakeland Forestry Consultants
- Wawasee Area Conservation Foundation
- Wild Birds Unlimited
- Wood-Land-Lakes RC&D
- Wright Timber/Green Farms, LLC
- Yellowwood Lake Watershed Management Planning Group
Updated: June 6, 2010