Filter (No State Total): Estimates of April 1 Population Density by County for Washington, 1900 to Present
Population density is measured in persons per square mile. The land area measurement excludes lakes and other water areas within. Adjusted/corrected federal census counts used as the numerator for years 2000 and 2010. The 2001-2009 population density estimates were derived from OFM's April 1 intercensal population estimate series.