While notes of higher denominations have all been redesigned to thwart counterfeiters, the $1 bill retains the same design it had nearly half a century ago. One of the now-unique features of the $1 bill is the Federal Reserve Bank stamp, seen to the left of Washington's head in the image above. It features a code (A through L) circled by the name of the city where the note was issued.
Given five minutes, can you name the U.S. cities where these 12 main Federal Reserve Banks are located? Good luck!