District 9 includes the cities of Bellevue, Newcastle, Renton, Maple Valley, Covington, Black Diamond, and Enumclaw, as well as large unincorporated areas.

[3] Prior to his service on the King County Council, Dunn was a federal prosecutor and Presidential appointee in the US Department of Justice.

In 2001, Dunn was appointed by President George W. Bush to serve in the United States Department of Justice (DOJ) as senior counsel to the director for the Executive Executive Office for United States Attorneys.

Following the September 11 attacks, Dunn was a Department of Justice delegate on President Bush's Task Force on Citizen Preparedness, where he helped form the USA Freedom Corps, Citizen Corps, and the Volunteers in Police Service Program and led efforts to expand the National Neighborhood Watch Program to include terrorism awareness.

[7] On November 29, 2021, Dunn launched an unsuccessful campaign for the U.S. House of Representatives in the 8th district against two-term incumbent Democrat Kim Schrier in 2022.