A study, conducted under a grant from Title I of the Library Services and Construction Act, was undertaken to determine: (1) the present level of library service in county and county-wide departments, agencies, and organizations in Nassau County, (2) what additional services are needed, and (3) how these services can best be achieved. Data were gathered by questionnaires and interviews with county governmental and county-wide nongovernmental groups. General needs identified in the study include: a list of community organizations; improvements in film services and a workshop on audio-visual service; more publicity on available library services, programs, and interlibrary loan services; and improved distribution of booklists and library publicity to county groups. Special concerns of the Nassau Library System Service Center involve: service to the disadvantaged, service to the chronically ill and homebound, and talking book service. Other major survey findings were: (1) that many groups are concerned with improving their proficiency in providing library materials to their staffs and clienteles, and they need help with professional collections, supplementary loans, and staff workshops and (2) that one of the greatest gaps in library service in Nassau County is service in the county institutions. Appendixes include the survey questionnaires and a list of the groups which responded. (JB)