The letter which precedes the numbers must be the same number that you saw identifying the Federal Reserve Bank. The serial number of a bill appears twice, once in the lower left hand quadrant and again in the upper right hand quadrant on the front of the bill. The following table is a handy reference for the bank codes: A corresponding Federal Reserve District Number code is found in four locations. The letter code is also found in the prefix of the serial number. On the one dollar bill, the bank can be quickly identified by a letter code in the Federal Reserve Seal to the left of the portrait of George Washington.
There are twelve different Federal Reserve Banks responsible for printing paper money in the United States.
The Federal Reserve Seal and the Federal Reserve District Number.
