Shoreline is a city in King County, Washington, United States. It is located between the city limits of Seattle and the Snohomish County border, approximately 9 miles (14 km) north of Downtown Seattle. As of the 2020 census, the population of Shoreline was 58,608, making it the 22nd largest city in the state. Based on per capita income, one of the more reliable measures of affluence, Shoreline ranks 91st of 522 areas in the state of Washington to be ranked.

Snohomish County is a county located in the U.S. state of Washington. With a population of 827,957 as of the 2020 census, it is the third-most populous county in Washington, after nearby King and Pierce counties, and the 72nd-most populous in the United States. The county seat and largest city is Everett. The county forms part of the Seattle metropolitan area, which also includes King and Pierce counties to the south.