Background: Community health-care services for older, home-dwelling persons with dementia tend to be underutilised. Family care-givers provide substantial care, and they often arrange for and co-ordinate health-care services on behalf of persons with dementia. Objectives: The aim of this study was to examine family care-givers' knowledge of unused services and their self-reported reasons for non-use of such services. We gathered cross-sectional survey data from 430 family care-givers of older persons with dementia in Northern Norway.