Introduction - The objective of this study is to update prevalence data on treated diabetes in France in 2007 and to assess geographic disparities by examining recent trends. Materials and Methods - The study was conducted based on an analysis of reimbursement data for 56.5 million individuals enrolled in the general health insurance scheme. People with treated diabetes were defined as those who received antidiabetic medications on at least three different dates during 2007. Results - In 2007, the prevalence rate of treated diabetes was 3.95%, corresponding to 2.5 million people. Analysis of prevalence rates by age group revealed significant differences: 0–44 years (0.4%), 45–64 years (5.8%), 65–74 years (13.3%), and 75 years and older (13.4%). Men face an increased risk starting at age 40. After adjusting for age and sex, the highest prevalence rates were observed in the overseas regions: Réunion (7.8%), Guadeloupe (7.3%), and Martinique (6.8%). In mainland France, the northeastern quarter and Seine-Saint-Denis (5.1%) were the areas with the highest prevalence rates. At the departmental level, the increase in prevalence was greater where the initial prevalence was higher. Discussion-Conclusion - The diabetes epidemic continues to advance inexorably, exceeding recent expert projections. The revelation of the high prevalence rate among those aged 60 and older and the growing geographic disparities must be incorporated into public health policies. (R.A.)