There are more than 3,400 Tree Cities USA. The following is a partial listing of Tree Cities USA. To be a Tree City, the community must meet four standards set by the National Arbor Day Foundation and the National Association of State Foresters: 1. * The community must have a tree board or department. 2. * The community must have established a community ordinance for tree care. 3. * There must be a community forestry program with an annual budget of at least $2 per capita. 4. * The community must have an Arbor Day observance and proclamation.