Agencies serving people with disabilities and disability advocacy organizations may benefit from having access to information about the prevalence of disability in their specific state. For instance, with such information state vocational rehabilitation agencies could compare the number of people they serve to the estimated number of working-age persons with disabilities in their state. Using these numbers, they could then compare their service delivery rate to that of other states. In a similar manner, advocates for persons with disabilities might find such data useful in making comparisons over time and across states in their effort to change not only government policy but also the practices of private business. For example, in an effort to persuade businesses to increase access and/or marketing toward persons with disabilities, advocates can show both state government and private businesses the size of the population with disabilities within their states and how it is changing over time.