People with intellectual or developmental disabilities (IDD) live in many different types of settings including homes of their own, with a family member, with a host or foster family, or in a provider owned or operated setting. Most live with a family member and receive informal supports from family members and friends. Some also receive supports funded by Medicaid or State funding authorities. This report describes long-term supports and services (LTSS) recipients with IDD and public LTSS expenditures for state Fiscal Year (FY) 2015 by setting type, setting size, funding source, state versus nonstate operation, and recipient age. Section 1 reports the prevalence of IDD, the number of people with IDD known to state IDD agencies, the number of LTSS recipients with IDD and the living arrangements of LTSS recipients as of June 30, 2015. Section 2 describes the Medicaid and state authorities through which people with IDD receive LTSS funding. It describes the number of recipients, total expenditures, and expenditures per recipient for Medicaid Waiver and Intermediate Care Facilities for Individuals with Intellectual Disabilities. For Waiver recipients it also describes recipients, expenditures and expenditures per recipient by age and living arrangement. Section 3 describes changes in LTSS recipients with IDD and expenditures by funding authority, setting type and setting size. Lastly, Section 4 examines the status of and national trends in the number of people with IDD living in state-operated IDD facilities serving 16 or more people (Public Residential Facilities or PRF for short) or in state-operated psychiatric facilities. [The National Residential Information Systems Project (RISP) functions within Institute on Community Integration/UCEDD (University Centers for Excellence in Developmental Disabilities).]