started servicing the Renton coal fields in 1877, and the Newcastle fields in 1878. By 1880, King County produced 22% of the coal mined on the West Coast, most of that coal being found within the Renton Formation's Muldoon coal seam.

Name

On February 24, 1986, the King County Council approved a motion to rename the county to honor civil rights leader Martin Luther King Jr.

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