Background, patients and methods. Analysis of medical certificates of cause of death for 5431 deceased people in region of Public Health Unit (PHU) Nova Gorica should give us a useful data for prevalence study of diabetes in region. Certificates have had some minor failings in data perfection but they are still satisfactory for numerical analysis and enable a rough evaluation of diabetes prevalence among people more than 65 years old. Results and conclusions. Analysis has shown that prevalence of diabetes in region at the end of life is between 6 and 15 percents. Among females is prevalence doubled as among males. The same ratio is seen when diabetes is basic cause of death. In subregion of Ajdovščina is that ratio even 3:1. The prevalence of diabetes in subregion Tolmin is hardly the half of that in subregions Ajdovščina and Nova Gorica. The possible cause for this observation are deaths of pronounced old population, which have had little connections with health services in subregion and had been badly evidenced, men much more worse than women.   About one third of people with diabetes have died from diabetes and his late complications. A half of people with diabetes have died from cardiovascular diseases, and one tenth from cancer and pulmonary diseases. All other causes have been rare. The specific mortality rate for diabetics in region exceeds Slovenian mean and even in literature cited evaluation for the USA.   The youngest deceased diabetic was 41, and median age of deads was 75 years. The median age of deceased diabetics in region exceedes the Slovenian median age of all deaths, for 3 to 5 years.