John Martin Derr
 
Born: circa 1737 - Philadelphia County, Pennsylvania
Died: after March 23, 1812 - Frederick County, Maryland
Buried: Thomas Family Cemetery near Adamstown, Frederick County, Maryland
 
Service: John Martin Derr served as a captain in the militia of Frederick County, Maryland.
 
Family: John Derr lived in Frederick County, Maryland. John’s first wife was Anna Cassell. His second wife was Elizabeth. John’s children included John and Anna Margaret.
 
Source: Clements & Wright, Maryland Militia in the Revolution. p. 69.