Introduction: Dental caries is one of the most prevalent diseases of childhood in developing countries. The prevalence and incidence of dental caries is influenced by various socio–demographic factors like age, sex, ethnic groups, dietary patterns and oral hygiene habit.

Materials And Methods: A population based cross–sectional study was conducted among the OPD of mithila minority dental college, darbhanga medical college and school going children in darbhanga from September 2015 to September 2018 total sample size 14580.

Result: The overall prevalence of dental caries was found to be 83.71%. Higher prevalence of dental caries was found among the girls (84%) among the upper socioeconomic class (89.63%), among those who consumed vegetarian diet (74.8%), Dental caries was found to be higher in prevalence among those Muslim religion (80.99%).

Conclusion: Dental caries is a preventable disease which can be alleviated by creating community awareness through health education activities. Irrespective of age groups, the prevalence of dental caries was found to be high and varied across in Darbhanga.