The District Feds are the 12 Federal Reserve Banks in the Federal Reserve System. Each bank serves financial institutions and the public in a multistate district, hence the nickname District Feds. A map on the Fed's Web site shows the 12 districts.
Each District Fed has a president, appointed by its board of directors to five-year terms that end on the last day of February in years ending in 1 and 6. Official bios appear on the Fed's Web site. District Fed presidents serve on the Federal Open Market Committee on a rotating basis.
Here is a list of the District Feds, with links to their Web sites.