The GI Bill
The second district in the Federal Reserve System is regulated by the Federal Reserve Bank of New York. This includes New York, and part of New Jersey.
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The Federal Reserve District appears only on bills with green seals that say "Federal Reserve Note" on their front side. Older blue- and red-seal notes were not issued through the Federal Reserve System so they don't have the district. There's a full description of the letters and districts at the BEP website:
It depends on what letter, if any, is next to the date. A 1928 C bill from the Cleveland* Federal Reserve District is quite valuable, with prices for a circulated bill in the $250 to $450 range as of 10/2011. Other letters are much more common; please see the Related Question for more. (*) To explain, there's no "Federal Reserve of Ohio". It's actually the Fourth Federal Reserve District which has its offices in Cleveland, so it's generally referred to as the Cleveland Federal Reserve District.
Look at the bottom of your checks, and you will see a series of numbers. At the far left bottom, read the first two digits -- this denotes your Federal Reserve district. For example, the lower left of my checks begin with 0829...... My Federal Reserve district is 08. You can then go to www.federalreserve.com and look up district 8 to get the headquarters of that district and contact information. Each bank's routing number begins with the two digits of their district. There are 12 total districts in the U.S.
District Bank? If so, then Atlanta
Regardless of the Federal Reserve District that distributed the bill, as of 09/2012 a 1928 $100 FRN retails for $125 to $180 depending on condition.
Chairman, Board of Governors, District Reserve Banks, and Member Banks.
"A" is the highest series letter for 1928 $50 Federal Reserve Notes. "K" is most likely the Federal Reserve District letter. The series letter, if any, on US bills is next to the date. Please see the question "What is the value of a 1928 US 50 dollar Federal Reserve Note?" for more information on values.
There were no series letters on any 1929 US bills. You may be referring instead to the Federal Reserve District letter; "G" indicates your bill was distributed by the Chicago district. There's more information at the question "What is the value of a 1929 US 100 dollar Federal Reserve Note?"
Grover Cleveland appeared on two different $20 bills, both printed in the 1914 series. There's more information at the question "What is the value of a 1914 US 20 dollar Federal Reserve Note?" For clarity, the bill was actually printed in Washington and was distributed by the Richmond Federal Reserve district.
Only banks can own stock in the Federal Reserve banks. However, this stock ownership does not provide the members banks with any control over what the Federal Reserve system does. Any bank that wants to become a member of the Federal Reserve Bank within their Federal Reserve District must invest a certain percentage of their capital in Federal Reserve stock. The Federal Reserve will pay dividends on this stock but banks do not become controlling shareholders as a result of these investments. The individual Federal Reserve banks are controlled (for lack of a better term) by the boards of directors of the Federal Reserve banks and by the board of governors in Washington, D.C.