- May 2 – The Fairfax County Police Department opens a substation in a converted home at the intersection of McWhorter Place and Ravensworth Road in Annandale. The new substation is commanded by Lieutenant Olin F. Sanders.
- "Fairfax County Police to Open New Substation at Annandale." The Washington Post, Times Herald (1959-1973): P8. ProQuest Historical Newspapers: The Washington Post (1877-1995). May 01 1966. Web. 21 Apr. 2012.
|Fairfax County by Year: 1966|
|April 1966||·||May||·||June 1966|