- The Arbor Day Foundation - Information on tree and shrub care; education resources related to trees; promoting the planting and maintenance of urban forests through Arbor Day programs, Tree City USA, and other programs.
- Western Center for Urban Forest Research and Education - Includes latest in urban forest research: GIS, inventory and monitoring, parking lot shade ordinances, urban heat islands, and guidelines for tree planting.
- Center for Urban Forestry at Morris Arboretum - Provides technical expertise and professional support for urban/environmental programs in the mid-atlantic and northeastern area of the United States.
- National Urban Forestry Unit - UK body, aims to raise awareness of the positive contribution that trees make to the quality of life in towns.
- USDA Forest Service, Urban Forest Research - Information on current research on the effects of the urban forest on air quality, climate, and carbon dioxide; as well as, research on urban forest management.
- Natural Landscapes in Urban Areas - Essay on the need for parks and other wildlife areas in urban environments.
- Texas Urban Forestry Council - Site provides information about the organization's programs, invasive pests, trees, has links to related sites and has a news page with urban forestry related articles.
- Tree Ordinance Guidelines - A handbook for the development and evaluation of local urban forestry programs.
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