Other pages about the topic: Population

Special area population estimates

OFM produces annual population estimates for ‘special areas’ required by statue.  Special areas include highway urban areas, public transportation benefit areas, and the thermal electric generating facility area.  The special area estimates are based on data produced by the Small Area Estimate Program using GIS-based spatial interpolation procedures.

Growth Management Act county projections

Population change

In accordance with RCW 43.62.035, the Office of Financial Management (OFM) shall determine the percentage increase in population for each county over the preceding ten-year period, as of April 1.

Census geographic files

Click on a tab below to access geographic data. Some of the data files are large and may require additional time to download.

Population density

Population density is the average number of people per unit of land area. In the U.S., the most common unit of population density is persons per square mile. The land area measurement excludes lakes and other water areas within.

2012 GMA projection background materials

Included here are documents describing the process of GMA projections.