The purpose of this study is to examine the association between physical activity adherence and social capital among uninsured primary care patients with or without hypertension and/or diabetes. Uninsured adults using a free clinic (N = 374) participated in a self-administered survey from January to April in 2016. The percentage of participants who were adherent to physical activity was low regardless of having hypertension and/or diabetes, or not. Individuals who reported a high sense of community were associated with a higher percentage of physical activity adherence. Good weight management was associated with less likelihood of physical activity adherence.