The document reports results of a needs assessment of the incidence and prevalence of developmental disabilities in New Mexico, in conjunction with estimates of the probable demand for residential services. An introductory section outlines the scope of the study and distinguishes among three types of demand for services: potential demand, expressed demand, and unexpressed demand. Estimates of the potential demand, up to 1995, for residential and related support services for individuals with developmental disabilities are presented in Section II. Section III analyzes the expressed demand for residential and related support services as of March 31, 1985. A conceptual diagram summarizes the breakdown of demand for residential and related day services. Seventeen tables, a bibliography, and five appendices are included. The methodology used to estimate size of the developmentally disabled population in New Mexico is described in Appendix A, while Appendix B outlines the procedure used to estimate the number of developmentally disabled adults receiving Supplementary Security Income payments and Social Security Disability Insurance benefits. (JW)