Although the family's prominence was originally gained via seafaring, Crowninshields later became most noted for the public service, primarily in politics and the military.
 The early Crowninshields were Republicans and were noted for their strong support of Thomas Jefferson.

The Crowninshields were particularly praised for their naval leadership.
 Benjamin Williams Crowninshield was United States Secretary of the Navy under both James Madison and James Monroe, while his great-great-grandson Charles Francis Adams III, also a noted yachtsman, was secretary under Herbert Hoover.
 Former U.S. Representative Jacob Crowninshield was appointed to be the second person to hold the position by Thomas Jefferson, but did not serve due to his ill health.
 His grandson Arent S. Crowninshield served as an admiral in the United States Navy and later as chief of the Navy's Bureau of Navigation during the McKinley Administration.

William Crowninshield Endicott was United States Secretary of War during Grover Cleveland's first term as President of the United States.
 Caspar F. Crowninshield served as a Union Army captain and brevet brigadier general during the American Civil War, while Charles Francis Adams, Jr., great-grandson of Benjamin Williams Crowninshield, served as a general.

Since the late 19th century, the family's political influence has been exercised primarily at the state and local levels, including in Vermont, New Hampshire, and New York, where multiple branches of the family settled, as well as in Massachusetts.
Although the family's prominence was originally gained via seafaring, Crowninshields later became most noted for the public service, primarily in politics and the military.  The early Crowninshields were Republicans and were noted for their strong support of Thomas Jefferson.
The Crowninshields were particularly praised for their naval leadership.  Benjamin Williams Crowninshield was United States Secretary of the Navy under both James Madison and James Monroe, while his great-great-grandson Charles Francis Adams III, also a noted yachtsman, was secretary under Herbert Hoover.  Former U.S. Representative Jacob Crowninshield was appointed to be the second person to hold the position by Thomas Jefferson, but did not serve due to his ill health.  His grandson Arent S. Crowninshield served as an admiral in the United States Navy and later as chief of the Navy's Bureau of Navigation during the McKinley Administration.
William Crowninshield Endicott was United States Secretary of War during Grover Cleveland's first term as President of the United States.  Caspar F. Crowninshield served as a Union Army captain and brevet brigadier general during the American Civil War, while Charles Francis Adams, Jr., great-grandson of Benjamin Williams Crowninshield, served as a general.
Since the late 19th century, the family's political influence has been exercised primarily at the state and local levels, including in Vermont, New Hampshire, and New York, where multiple branches of the family settled, as well as in Massachusetts.
Crowninshield family