Background: The importance of community health psychology in providing complex bio-psycho-social care is well-documented. We present a mixed-method study monitoring the efficacy of health psychology services in the Public Health Focused Model Program for Primary Care Development (2012-2017) in four disadvantaged micro-regions in North-East Hungary. Methods: Study 1 assessed the availability of the services using a sample of 17003 respondents. Study 2 applied a follow-up design to measure the efficacy of the health psychology services in a sample of 132 clients. In Study 3, we conducted focus group interviews to assess clients’ lived experiences. Results: More mental health issues and higher education predicted a higher probability of service use. Follow-up showed that individual and group-based psychological interventions resulted in lower depression and (marginally) higher well-being. Thematic analysis of the focus group interviews indicated that participants deemed topics like psychoeducation, a greater acceptance of psychological support, and heightened awareness of individual and community support important. Conclusions: The results of the monitoring studies demonstrate the important role health psychology services can play in primary health care in disadvantaged regions. Community health psychology can improve well-being, reduce inequality, support the population’s health awareness, and address unmet social needs in disadvantaged regions in Hungary.