Urban forests are defined as all trees within an urban setting, on private or public land, that compose the tree canopy within a city. Urban forests and street trees have many associated benefits, including carbon sequestration, energy saving, aesthetic qualities, increased property values, and better health outcomes for neighborhood residents. In Philadelphia, tree planting initiatives are undertaken by municipal agencies, such as the Department of Parks and Recreation, and nonprofit organizations, such as the Pennsylvania Horticultural Society (PHS). There are environmental justice concerns with tree planting initiatives. Urban tree canopy coverage varies across neighborhoods, so the geographic distribution of new tree plantings has the potential to inflame pre-existing disparities. This study uses GIS to analyze the distribution of new street tree plantings by PHS’s Tree Tenders program using Census demographic data. Odds ratios calculated for each zip code in Philadelphia reveal the uneven nature of street tree plantings across the city. Neighborhoods with greater proportions of white residents, higher median income, higher educational attainment, and more recently-moved residents received a disproportionate number of trees. For most demographics, income was a mediating factor. Considering the built environment of Philadelphia’s diverse array of neighborhoods in tandem with the PHS Tree Tenders’ distribution model provides insight into distributional inequities.