King County (population 1.8 million) has the largest population in both Washington State and the Northwest. Gang members are living in almost every city of King County. Many of these gangs do not hold traditional gang territory. Because demographic trends are changing in the city of Seattle, the low-income population is moving southward towards Renton, Tukwila, Kent, Des Moines, Federal Way and Auburn.

Below is a listing of all the gangs contacted by the King County Sheriff's Office in 2006. I've also added a few gangs I know of to the list.

BLOODS

• 37th Street Bloods
• 3P Mafia
• Denny Block (originally from San Francisco)
• East Valley Piru
• Elm Street Piru
• Low Profile
• Mafia Bloods
• Manor Gangster Bloods
• Money or Blood
• Murder On Arrival
• Native Pride Bloods
• Rainier Valley Bloods
• Seattle Mafia Piru
• Tree Top Piru
• Valley Hood Piru
• Villains of Society
• West Side Street Mobb
• Yesler Street

CRIPS

• Avalon Gangster Crips
  
• East Coast Crips, 89 NHC
• Family Mafia Crips
  
• Gangster Crips, 83
• Grape Street Crips
• Hilltop Crips
• Holly Park Crips
• Hoover Criminals, 46
• Hoover Criminals, 74
• Hoover Criminals, 107
• Insane Boyz Crips
• Kelly Park Crips
• Lakewood Hustler Crips
• Marvin Gangster Crips
• Rollin 60's Crips
• Rollin 90's Crips
• Santana Blocc Crips
• Three King Crips
• West Covina NHC
• West Side 23

GANGSTER DISCIPLES

• Deuce 8- Out Seeking Crime
  
• Deuce Jive
• Down Wit The Crew
• East Union Street Hustlers
• Horton Block
  
• Juneau Street
• West Side

HISPANIC

• Almighty Latin King Nation (Federal Way, Kent)
  
• Brown Pride Locos 13
• Callejones Escondidos 13
• Cholos in Azatlan
• Crossroads Eastside Locos 13 (Bellevue)
• El Monte Flores 13 (Burien, Federal Way, Renton)
• Florencia 13 (Kent)
  
• Gangster Surenos Cliqua 13
• Little Valley Lokotes 13 (Kent)
  
• Mara Salvatrucha 13
• Puro Mexicano Locos (Bellevue)
• Rancho San Pedro 3rd Street (Kent)
• South Park Locos 13
• South Side Gangsters 13
• South Side Locos 13
• South Side Playboy Surenos 13, Rascals (RCLS)
  
• United Latinos
• Varrio Brown Neighborhood
• Varrio Surenos Lokotes 13
• Varrio Locos 13
• Vatos Locos 13
• West Side 18th Street

ASIANS

• Filipino Bad Pinoy
• Little Ruthless Boyz
• Loc'd Out Crips
• Loco Asian Boyz
• Mad Pack
• Oriental Fantasy Boyz
• Oriental Loco Boyz
• Ruthless Asian Gang
• Scandalous Asian Gang
• Sons of Samoa
• Tiny Raskal Gang
• Tongan Crip Gang
• Tongan Family Crips
• Trey Deuce Crips
• Young Oriental Troop
• Young Seattle Boyz

HYBRID

• Buena Huerta Criminales (Hispanic & Blacks)
  
• East African Posse
• Highrollers (Bellevue)
• Point Side Gangsters 44 Strong
• South Cloverdale 74-53, a.k.a. Dale Blocc