Social service providers were surveyed in an attempt to obtain an estimate of current social service utilization patterns. A survey was mailed to the director of each major social service agency in the community and filled out in conjunction with a map of the catchment area. Respondents were asked first to outline those areas on the map which they perceived as their "service area," and second, to indicate the particular location from which came the greatest number of their clients. Areas pinpointed by agencies as high in utilization were geo-coded according to census tract. Summing these ratings across respondents produced an estimate of utilization index for each census tract which was compared with a social indicator based index of mental health need. Tracts with the greatest discrepancy between need and service utilization were targeted as high priority intervention areas. Service utilization patterns were also analyzed for particular types of agencies, e.g., public versus private, health versus educational. (Author)