 As of the 2010 census, the population of Shoreline was 53,007, making it the 20th largest city in the state; by 2019, the population had risen to an estimated 57,027.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.The Shoreline area was inhabited by the Native American Duwamish people for at least 4,000 years before the first permanent European settlers began platting the neighborhood of Richmond Beach, on Puget Sound, in 1890, in anticipation of the arrival of the Great Northern Railway the next year.