Mental health literacy in urban primary care clinics is crucial for improving access to mental health services. A mixed-methods approach was employed, including pre-and post-campaign surveys (n=200) and qualitative interviews (n=15). Campaign participants reported significant increases in knowledge about mental health conditions (mean increase 34.5% with a 95% confidence interval of ±7.8%). Findings indicate that sustained engagement through regular campaigns can enhance community understanding and support for mental health. Long-term sustainability requires ongoing education programmes, local leadership involvement, and integration into routine healthcare delivery. Mental Health Literacy, Primary Care Clinics, Urban Kenya, Evaluation, Sustainability