This study is a comparative analysis of long-term psychogeriatric and mixed-care unit patient characteristics in nursing homes and hospitals in Helsinki. The role of the so-called psychogeriatric nursing homes is still under question and not well developed. The aims of the study were to identify and survey psychogeriatric wards and analyze whether these units differ from the rest of the long-term units/wards in terms of patients' characteristics. Participants studied were a total of 2828 elderly long-term care residents, of which 372 were living in long-term psychogeriatric and 2456 in ordinary long-term care units. Data were drawn from the Resident Assessment Instrument (RAI) database and had been collected in the project "Benchmarking and implementation of RAI in Elderly Care in Finland". Scales and items based on Minimum Data Set were used for the comparisons. Resident groups in psychogeriatric units and in ordinary, mixed-client settings were clearly distinguishable. The psychogeriatric residents were younger, had more comorbidity as to psychiatric diseases, and had more often psychiatric symptoms and psychotropic medications. The residents in psychogeriatric units did not differ in cognitive and functional status from those in mixed-client units and had similar comorbidity as to somatic diseases. This study shows that psychiatric symptoms that need to be addressed are common in long-care facilities. The results emphasize the importance of recognition of the multiple care needs of elderly with severe mental symptoms or illness.