This study presents and discusses existing data on disability by state, from the 1980 and 1990 censuses, the Current Population Survey (CPS), and the National Health Interview Survey (NHIS). The study used direct methods for states with large sample sizes and synthetic estimates for states with low sample sizes. The study's highlighted findings include: (1) states differ substantially in the rate and severity of work disability (7 of the 10 states with the highest rates of work disability are in the South); (2) an adult in West Virginia is 3.6 times as likely as one in Alaska to be prevented from working; (3) the CPS generates estimates with consistently greater accuracy than the NHIS (as compared to 1990 census values); (4) increased rate of high school completion are associated with declines in work disability; (5) an adult in Mississippi is three times as likely as one in Alaska to have difficulty in mobility or self care; and (6) the rate of work disability declined nationally, from 85.2 per thousand in 1980 to 81.5 per thousand people aged 16 to 64 years in 1990. Extensive tables and figures illustrate and detail the study's findings. (Contains 37 references.) (DB)