The habitats of the proboscis monkey (Nasalis larvatus), an endemic, non-human primate of Borneo, is not only mangrove forest, swamp peat forest, and riverine forest, but also rubber forest (Hevea brasiliensis). The present research aimed to map the types and status of the habitats and estimate the population of proboscis monkey in Balangan District, South Kalimantan. Data was collected in May – June 2012. The activity was initiated with interviews with the people asking whether they have seen/met the proboscis monkey at locations where they carry out their daily activities, and if yes, where the location was. There were 13 locations where the proboscis monkey was found. In 8 locations the monkey was directly sighted and in 5 others its presence was reported by people interviewed. Most locations had rubber forest while others were non-rubber forest growing on baruh. The perceptions and attitudes of the people toward the proboscis monkey varies. Most people (86.96%; n = 23) did not know that the proboscis monkey is a protected animal. Most people (91.30%; n = 23) were aware that hunting of the proboscis monkey was practiced.