What was the highest denomination Federal Reserve Note?

$10,000 was the highest denomination of Federal Reserve Note. They were printed in limited numbers up through 1945, although they carried a 1934 series date.

Other high-denomination bills were $500, $1000 and $5000. $500 bills saw moderate use by businesses in the days before electronic funds transfers and widespread use of checks. Still, demand for the bills was low and they were all discontinued in 1945, the same as $10,000 bills.

Banks were still allowed to distribute the bills on request, but they became popular as a way for criminals to easily hide large amounts of money without detection. That led the government to halt all distribution of high-value bills as of mid-1969.

In addition to these bills, about 42,000 special $100,000 gold certificates were printed in 1934 and 1935 but these were only for internal use by the Federal Reserve System and never circulated.