Aim: to assess the association of Pre-Diabetes, Diabetes and BMI with family history among urban population. Materials and Methods: A Community based cross-sectional study was carried out in the field practice area of department of Community Medicine, Nalanda Medical College and Hospital, Patna, Bihar, India among 200 respondents. Participants were in the age group of 20-67 years. Among them 110 males and 90 females were interviewed by using pretested semi structured questionnaire. Fasting Capillary blood glucose level was measured with the help of Glucometer (According to WHO-2006. people with plasma glucose between 110 mg/dl to 125 mg/dl are pre-diabetic and those higher than 126 mg/dl are diabetic). Family history of diabetes mellitus was obtained from each subject and classified into three groups, viz. 1= no family history of diabetes mellitus, 2= one parent affected and 3= both parents and siblings affected. WHO, 2008 criteria for classification of diabetes mellitus was used to assess the BMI of Participants. People with BMI <18 was considered underweight, between 18-24.9 normal weight, between 25-30 overweight and >30 were classified as obese. Results: In the present study overall prevalence of pre- diabetes was 11.9% and diabetes mellitus was 7.2%. Out of which 6.6% were newly diagnosed and 0.6% were known diabetic. It is observed that 81 (40.5%) of the respondents were in the age group of 20-30 years followed by 44(22%) above 50 years of age. While 20% respondents were in age-group of 30 to 40 years and 35 (17.5%) were in 40-50 years of age group. Out of the total 200 respondents, (55%) were male and (45%) were females. Positive family history was observed more among 17.39% pre-diabetics and 20% diabetics as compared to respondents with normal blood glucose level i.e 10.8%. The association was found to be statistically significant. The statistically significant association was observed between family history and BMI. More than 57.14% respondents who had positive family history of diabetes had higher BMI. Conclusion: Family history of diabetes mellitus was observed in 11% of total screened respondents. Out of which 7% were having 1 parent as diabetic and 4% had both parents and siblings diabetic. Due to high prevalence of pre-diabetes, it is necessary to educate them about risk factors of non - communicable disease and measures for life style modification.