Introduction: India, Diabetic capital of the world, is having the prevalence of Type 2 Diabetes Mellitus (DM2) of 2.4% in rural and - 11.6 % among urban population. As published studies of DM2 are few from Bihar and none from Darbhanga, mandating the endeavour to study the prevalence and to ascertain few risk factors of DM2 in urban population of Darbhanga. Objectives: 1. To study the prevalence of diabetes mellitus among adults aged 20 years and above. 2. To know few risk factors associated with diabetes mellitus. Methods: The present study was a community based cross sectional study in urban area of age group ≥ 20 yrs by Interview method using pre tested semi-structured Performa. Diabetes screening was done through blood glucose estimation in which random capillary blood glucose was determined using glucometer. Results: The prevalence of Diabetes was 8.8 % (Males 8.46% & Female 9.10%). The prevalence of Pre- diabetes and Diabetes was highest in 61-70 yrs of age group. The association between pre- diabetes, diabetes and smoking, non vegetarian diet, positive family history was found to be statistically significant. Conclusion: Prevalence of DM2 is on the increasing trend. National programme for prevention and control of diabetes must be implemented. BCC & IEC activities should be regularly conducted to lessen the complications. Media and NGOs should be involved to combat the problem.