Dementia is described as various symptoms of cognitive deficit of the brain in the elderly. It is a major public health problem worldwide. The prevalence of dementia is increasing with ageing among the world population. Alzheimer__ampersandsignrsquo;s disease is the most common cause of dementia in people aged 65years and older. Objectives: To find out the prevalence of cognitive deficit among inmates of an old age home and socio-demographic factors associated with it. Materials and Methods: A cross-sectional study was conducted to screen and detect the prevalence of cognitive deficit in institutionalized elderly by using Mini-Mental State Examination chart. Results: Among the 30 inmates studied, 18 (60%) were found to have cognitive impairment of which 5 (16.7%) had mild, 10 (33.3%) had moderate and 3(10%) had severe impairment. Cognitive impairment was significantly higher among those above 60 years, p value=0.026. Cognitive impairment was higher among those who were illiterate, 5 (71.4%) and unemployed, 17 (60.7%), but not significant. Diabetes and hypertension were not found to be associated with cognitive impairment. Conclusion: Prevalence of cognitive deficit was found to be high among the institutionalized elderly.