Casablanca is a major economic hub in Morocco with significant migrant worker populations from various countries. Geographic Information Systems (GIS) were used to map healthcare facilities and migration patterns. A logistic regression model was applied to predict the likelihood of utilising healthcare services based on distance from facilities and income levels. Migrant workers living within a one-hour drive had a higher utilization rate of primary healthcare services compared to those more than two hours away, with an odds ratio (OR) of 1.50 (95% CI: 1.23-1.82). Geographic accessibility significantly impacts the healthcare utilization patterns of migrant workers in Casablanca. Healthcare facilities should be strategically placed closer to migrant worker settlements and income-based health insurance schemes should be implemented to improve coverage. Migrant Workers, Healthcare Utilization, Geographic Accessibility, Logistic Regression Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.