Background: The socio-economic level is probably among the central risk factors for type 2 diabetes mellitus (T2DM) along with obesity, decreased physical activity and smoking. The International Diabetes Federation notes in particular that the main impact in the prevalence of diabetes is observed in low and middle-income countries, hence the disease might disproportionately affect lower socioeconomic groups. The aim of the study was to determine the prevalence of diabetes and impaired glucose tolerance (IGT) and assess its association with the type of place of residence in Bulgaria -cities, small towns and villages.