- August 7 – 62-year-old James L. Davis drowns while wading in Lake Fairfax. Davis, who could not swim, waded about 20 feet from shore to where the lake bed dropped off sharply. His corpse is discovered the following morning in 14 feet of water.
- August 22 – 57-year-old Delmar A. Lough fatally injures 8-year-old Karen S. Edwards when she runs in front of his car on Route 50 in the Pender region of Fairfax. Karen is taken to Fairfax Hospital, where she is pronounced dead.
- "Ex-GSA Employe Drowns Wading In Lake Fairfax" Evening Star, 8 Aug. 1966, Three Star NIGHT FINAL, p. 28. NewsBank, . Accessed 2 Jan. 2018.
- "Fairfax Girl, 8, Killed by Auto." The Washington Post, Times Herald (1959-1973): 1. Aug 23 1966. ProQuest. Web. 26 Dec. 2017.
|Fairfax County by Year: 1966|
|July 1966||·||August||·||September 1966|