#27: John Quincy Adams
Est. Net Worth: $27 million
The son of John Adams, John Quincy grew up with privilege and education but made his own mark through diplomacy and politics. He served as an ambassador, senator, and secretary of state before becoming president, earning income from government service and family holdings.

After losing reelection, Adams served for nearly two decades in Congress, where he fought fiercely against slavery. His finances stayed stable thanks to family assets and careful management. When he died in 1848, he left behind both a strong legacy and a comfortable estate.
