From “Disability Characteristics of Income-Based Government Assistance Recipients in the United States: 2011,” published by the U.S. Census.

Nationally, 30.4% of all adult Americans receiving social assistance of one kind of another are classified as having a disability, meaning they have impaired vision, hearing, mobility or cognitive functioning. The numbers for Virginia:

Government assistance recipients: 859,000
Percentage of recipients with disability: 33.4%
Percentage with cognitive difficulty: 15.9%
Percentage with ambulatory difficulty: 20.3%
Percentage with self-care difficulty: 17.4%

— JAB