This project aims to advance the understanding of cultural ecosystem services to human wellbeing, particularly in urban areas of the United States. Using a comprehensive measure of wellbeing (the Gallup-Healthways Survey) and the Park Score Index from the Trust of Public Lands, this empirical study is the first to analyze the link between urban parks and subjective well-being across the U.S. The study bridges key knowledge gaps by identifying domains of wellbeing for urban residents and analyzing wellbeing in the context of urban green spaces such as parks. It found that park quantity, measured as the percentage of city area covered by public parks, was among the strongest predictors of overall wellbeing. The strength of this relationship seemed to be driven by parks' contributions to community and physical wellbeing. Other findings from this study imply that expansive park networks are linked to multiple aspects of health and wellbeing in cities and overall quality of life.