- June 13 – 15-year-old Alexandria youth Steven G. Norris is struck and killed when he runs into the path of the cruiser driven by Fairfax County Police Corporal Robert L. Ellis, who was responding to a domestic call on Route 1. Norris is taken to the Alexandria Hospital, where he is pronounced dead.
- June 29 – By a 5-2 vote, the Fairfax County Board of Supervisors imposes a 1% local sales tax as part of a package of four new taxes to finance a 24% spending increase in the county's 1966-1967 budget, with only Supervisors Harriet Bradley and John L. Beerman opposing the new tax.
- "Youth Killed by Police Car in Fairfax." The Washington Post, Times Herald (1959-1973): 2. Jun 14 1966. ProQuest. Web. 6 Jan. 2014.
- Boyd, Kenneth M. "Fairfax County Joins 3 Per Cent Tax Club." The Washington Post, Times Herald (1959-1973): 1. Jun 30 1966. ProQuest. Web. 2 Aug. 2014.
|Fairfax County by Year: 1966|
|May 1966||·||June||·||July 1966|