The Social Security Administration has released the latest national statistics regarding SSI payments. They are available by county for each state. The New Hampshire SSi statistics show that New Hamsphire's 10 counties had a total of 15,849 SSI recipients as of December 2008. Take a look at the stats to see the county by county breakdown. The most populous county of Hillsborough, home to Manchester and Nashua, had the most SSI recipients.
The full list of SSI recipients by state and county is also available.