|Birthplace:||Saybrook, Middlesex, Connecticut, USA|
|Death:||(Date and location unknown)|
Son of Lt Thomas Leffingwell, Sr., Lt. and Mary Leffingwell
|Managed by:||Private User|
About Jonathan Leffingwell
Thomas and Mary had five sons and two daughters. Two of the sons, Jonathan and Joseph, disappeared without trace.
- Albert Leffingwell and Charles Wesley Leffingwell, The Leffingwell Record, 1897