The City of San Gabriel, 4 square miles with a population of 40,000, is a relatively small city in the San Gabriel Valley. San Gabriel parks are one of the factors that add to the quality of life of its residents. According to the The California Healthy Places Index, a tool developed by the Public Health Alliance of Southern California to assess local factors and social determinants of health, San Gabriel has healthier community conditions than 44.5% of California communities.