International Center for Disability Information 

By Category Type, The Number Of People Receiving Federally Administered Supplemental Security Income (SSI) Payments, By Source Of Payment (2000). 
Category  Total  Federal Payment Only  Federal And State Supplementation  State Supplementation Only 

All Categories  6, 601,686 
4,121,049 
2,198,858 
281,779 
Aged  1,289,339 
666,671 
519,638 
103,030 
Blind  78,511 
42,571 
30,360 
5,580 
Other Disability  5,233,836 
3,411,807 
1,648,860 
173,169 
Note: To calculate the percent
of people out of the total number of people who receive Federally
administered SSI through a particular source who are in a certain category,
divide the number of people who receive Federally administered SSI through
a particular source who are in a certain category by the total
number of people who receive Federally administered SSI
who are in the same certain category and multiply the result by 100. Example:
Calculate the percent out of the total number of people who are in the aged
category who receive SSI through Federal payment only. This calculation would
be: 666,671/1,289,339=.517 and .517x100=51.7%
Source: Social Security Administration, SSI Annual Statistical
Report, 2000.