- July 1 – The new Fairfax County Police Juvenile Squad, headed by Detective David R. Eike, and Traffic Squad, headed by Lieutenant Lewis Shumate, begin operating out of the old Fairfax County Jail building. Private Eugene G. Columbus joins the new Juvenile Squad. Additionally, the Detective Bureau headed by Lieutenant Grafton L. Wells is consolidated, and Marvin Harell, Donald Hurst, and Willard Bennett are promoted to the bureau.
- July 19 – Charles A. Fitzgerald, a 45-year-old bricklayer, fatally shoots his drunken 26-year-old nephew Andrew W. Beasley, Jr. in the back yard of his home in Falls Church to settle an argument. Beasley is taken to the Arlington Hospital, where he dies about two hours later.
- "Fairfax Creates Two Police Units." The Washington Post and Times Herald (1954-1959): 26. ProQuest Historical Newspapers: The Washington Post (1877-1995). Jun 30 1955. Web. 12 Mar. 2012.
- "Virginia Man Fatally Shot during Family Argument." The Washington Post and Times Herald (1954-1959): 27. Jul 20 1955. ProQuest. Web. 4 Oct. 2016.
- "Bond Releases Suspect in Slaying of Nephew." The Washington Post and Times Herald (1954-1959): 3. Jul 21 1955. ProQuest. Web. 4 Oct. 2016.
|Fairfax County by Year: 1955|
|June 1955||·||July||·||August 1955|