Individuals (n = 65) who reside in a agricultural area and report loneliness will be randomized to either (1) therapist-delivered cognitive-behavioral therapy for perceived social isolation, or (2) therapist-delivered Health Education. Loneliness, quantity of social interactions, perceived social support, substance use outcomes, and other key outcomes and descriptive characteristics will be assessed at baseline, mid-treatment, post-treatment, and at a one-month follow-up. Participants will have the option to complete daily ecological momentary assessments (EMA) 3 times a day for 7 weeks via an app on their smartphone, Catalyst by MetricWire, throughout the intervention period.