In 2000, more than 120,000 admissions to substance abuse treatment facilities were homeless at the time of admission. These admissions comprised 10 percent of the admissions for whom living arrangements were recorded. This proportion has remained consistent since 1997. Admissions to treatment facilities are tracked in the Treatment Episode Data Set (TEDS), an annual compilation of data on the demographic characteristics and substance abuse problems of those admitted for substance abuse treatment. Only data on admissions for the 41 States with a response rate of 75 percent or higher on this data element in 2000 were used for this report. Demographic characteristics of the homeless admissions include: 1) the average for homeless admissions was 38 compared to 33 for non-homeless; 2) the proportion of homeless admissions over 45 was 23 percent compared to 15 percent for the non-homeless; 3) 76 percent of the homeless admissions were male; 4) homeless admissions were more likely to be veterans (10 percent vs. 6 percent) than the non-homeless; and 5) homeless admissions were 53 percent White and 30 percent Black compared to non-homeless who were 59 percent White and 24 percent Black. Characteristics of primary substance of abuse for homeless admissions included the following: 1) alcohol was the primary substance of abuse for 51 percent compared to 47 percent for non-homeless; 2) homeless admissions were more likely to be admitted for smoked cocaine abuse (17 percent vs. 10 percent) but less likely for marijuana abuse (5 percent vs. 17 percent); and 3) large differences existed in the distribution of primary substance of abuse by race/ethnicity among the homeless admissions. In addition, 23 percent of homeless admissions reported co-occurring disorders (the co-occurrence of a substance abuse problem and a psychiatric disorder) compared to 20 percent of non-homeless admissions. Other characteristics of homeless admissions included data on source of referral, treatment setting, and prior treatment. 3 figures and 2 tables