Question: what is the largest county in population in washington state
Answer: President and principal author of the Declaration of Independence 7004298720000000000 ♠ 29,872 7003180900000000000 ♠ 1,809 sq mi ( 7003468500000000000 ♠ 4,685 km ) King County 033 Seattle 1852 Thurston County William R.