Burien ( BEWR-ee-ən) is a suburban city in King County, Washington, United States, located south of Seattle on Puget Sound. As of the 2010 Census, Burien's population was 33,313, which is a 49.7% increase since incorporation in 1993. An annexation in 2010 increased the city's population significantly, and as of 2019 the population was an estimated 51,500.

Kent is a city in King County, Washington, United States. It is part of the Seattle–Tacoma–Bellevue metropolitan area and had an estimated population of 132,319 as of 2019, making it the fourth-largest municipality in greater Seattle and the sixth-largest in Washington state. The city is connected to Seattle, Bellevue and Tacoma via State Route 167 and Interstate 5, Sounder commuter rail, and commuter buses. Incorporated in 1890, Kent is the second-oldest incorporated city in King County, after Seattle. It is generally divided into three areas: West Hill (mixed residential and commercial along Interstate 5), Valley (primarily industrial and commercial with some medium density residential; significant parkland along Green River), and East Hill (primarily residential with retail).

Issaquah ( ISS-ə-kwah) is a city in King County, Washington, United States. The population was 30,434 at the 2010 census and an estimated 39,509 in 2019. Located in a valley and bisected by Interstate 90, the city is bordered by the Sammamish Plateau to the north and the "Issaquah Alps" to the south. It is home to the headquarters of the multinational retail company Costco. Issaquah is included in the Seattle metropolitan area.

Bellevue ( BEL-vyoo) is a city in the Eastside region of King County, Washington, United States, located across Lake Washington from Seattle. It is the third-largest city in the Seattle metropolitan area and has variously been characterized as an edge city, a suburb, boomburb, or satellite city. Its population was 122,363 at the 2010 census and 148,164 in a 2019 census estimate. The city's name is derived from the French term belle vue ("beautiful view").Bellevue is home to some of the world's largest technology companies. Prior to 2008, its downtown area underwent rapid change with many high-rise projects being constructed, and was relatively unaffected by the economic downturn. Downtown Bellevue is currently the second-largest city center in Washington state, with 1,300 businesses, 45,000 employees, and 10,200 residents. In a 2018 estimate, the city's median household income was among the top five cities in the state of Washington. In 2008, Bellevue was number one in CNNMoney's list of the best places to live and launch a business, and in 2010 was again ranked as the fourth-best place to live in America. In 2014, Bellevue was ranked as the second-best place to live by USA Today.More than 145 companies have been located in Bellevue; companies currently headquartered there include PACCAR Inc, T-Mobile, and Valve. Technology company Amazon was founded in Bellevue by Jeff Bezos.