This study examined service use and expenditures for people with intellectual and developmental disabilities (IDD) living at home and in the community in California in 2005 and 2013. The number of people assessed for IDD services increased, along with the percentage of individuals who did not receive any services between 2005 and 2013. Controlling for client needs, children age 3–21 were less likely than other age groups to receive any services using logistic regressions. All racial and ethnic minority groups were less likely to receive any services than were white populations. Females, younger people, and all racial and ethnic minority groups who received services had significantly lower expenditures, with wide geographic variations. The disparities by age, gender, race/ethnicity, and geography have persisted over time in California.