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Background and Aim: Osteoporosis significantly compromises the quality of life of postmenopausal women. There are DALY (Disability-Adjusted Life Years) losses for postmenopausal women who suffer from osteoporosis. Therefore, this study was taken up with the objective to determine prevalence of osteopenia and osteoporosis among postmenopausal women and to study the association of their anthropometric parameters and lifestyle factors with their bone mineral density (BMD). To study the determinants of BMD among postmenopausal women with special reference to anthropometric and lifestyle factors in an urban slum. Materials and Methods: A community-based, cross-sectional study was conducted in an urban slum of Mumbai. The study was conducted among 148 postmenopausal women. BMD of the study group was measured using portable, noninvasive Calcaneum Ultrasound Bone Densitometer, and T-score reading was noted. Lifestyle factors and dietary habits were assessed through a prestructured, validated questionnaire. Body mass index (BMI) was calculated with a standard procedure. No trial was conducted in the study. Statistical Package for Social Sciences (version 20) was used for statistical analysis. Results: The prevalence of osteopenia among study participants was found to be 43.9% and that of osteoporosis was 12.8%. Their BMI was in the range of 16.44–39.18 kg/m2. Walking, stretching exercises, and yoga were the form of exercise being practiced by 29.1% of postmenopausal women. Conclusions: BMD was significantly associated with age, socioeconomic status, BMI, exercise, walking, and consumption of fruits. Negative correlation was found between duration since menopause and BMD T-score reading, which implied that duration since menopause had an inverse relationship with BMD.