One Nation/One Project (ONOP) is a national arts and public health initiative with a focus on the arts as a way to rebuild the social fabrics and wellbeing of communities in the United States following the pandemic. The Theory of Change (ToC) survey dataset consists of data representing over 2,000 respondents from the 18 ONOP cities, while the Arts Participation (AP) survey data represents more than 9,000 respondents from the general US population.