The National Parks Service ONLY has 5 HOOPER Sailors listed as serving in the Civil War. They are ALL from Maryland. There may have been more, but these are all that are in their database:

Hooper, Caleb

• Place Of Birth: Baltimore, Maryland

• Muster: Dec 31 1864 - St. Lawrence
  Apr 1 1865 - St. Lawrence
  Jun 30 1865 - St. Lawrence
  Sep 30 1865 - St. Lawrence

• Ship: St. Lawrence

Hooper, James

• Place Of Birth: Baltimore, Maryland

• Muster: Mar 31 1864 - Shokokon
  Jun 30 1864 - Shokokon
  Oct 1 1864 - Shokokon
  Dec 31 1864 - Shokokon
  Mar 31 1865 - Shokokon

• Ship: Shokokon

Hooper, John

• Place Of Birth: Baltimore, Maryland

Hooper, Joseph

• Place Of Birth: Annapolis, Maryland

• Muster: Jan 20 1863 - Portsmouth
  Mar 31 1863 - Portsmouth
  Jun 30 1863 - Portsmouth
  Jan 1 1864 - Portsmouth
  Apr 1 1864 - Portsmouth
  Jun 30 1864 - Portsmouth
  Oct 1 1864 - Portsmouth
  Jan 1 1865 - Portsmouth

• Ship: Portsmouth

Hooper, Josiah

• Place Of Birth: Maryland