- Conservation Design Forum, Inc.
 - Elmhurst - Specialising in landscape architecture, community planning, ecological restoration, and resource management. - David Gill/Steven Halberg Limited
- Saint Charles - Golf course designers and architects.
- Grant and Power Landscaping
- West Chicago - Provides landscape design, installation services, and maintenance.
- Hitchcock Design Group
- Naperville - Specialises in urban planning and design, commercial and residential property, and corporate properties.
- Trinity Landscape of Northern Illinois, Inc.
- West Dundee - A full service company, providing landscape installation, irrigation, and maintenance programmes.
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