King County Population Overview
Population
• King County’s estimated population in 2006 was
1,805,461.
• King County represents 28.6% of Washington State’s
population.
• Between 2000 and 2006 the County population grew at a rate
of 3.9%.
• The County’s distinct position as the largest population
center in the State poses many opportunities and challenges.

Download Data | Source: Claritas 2006 Update (Census
Tract Level)
Subregional Boundaries
- King County is divided into four regions in order to
distinguish trends at finer level of detail.
- Boundaries are delineated using the 19 school districts
serving the county.
Read more about Geographic
Boundaries.
- Data is queried by census tract then grouped by district
boundaries to create a subregion.
Source: Communities Count, 2005, Public
Health--Seattle & King County,
http://www.communtiescount.org
Using the 2000 census tract boundaries, the data is organized
as follows:
- North King County 31 census tracts
- East King County 88 census tracts
- South King County 130 census tracts
- Seattle 124 census tracts

Download Data
| Source: Claritas 2006 Update (Census
Tract Level)
Subregional Population
Between 1990-2000, the U.S. Census reports that King County
grew at a rate of 15.2%, with an additional 3.9% growth in the
last six years (2000-2006). The following data shows how
distinct growth patterns are emerging by subregion.
North King County
- North King County currently makes up 7.8% of the King
County population.
- 1990 to 2000 growth rate: 9.7%. (12,322 people).
- 2000 to 2006 growth rate .6% (791 people).
- This represents the slowest growth rate among King
County subregions.
East King County
- East King County currently represents 24.8% of the total
County population.
- 1990 to 2000 growth rate: 19.4% (67,064)
- 2000 to 2006 growth rate: 8.4% (34,555 people)
South King County
- South King County has the largest population with 35.4% of the total county population.
- 1990 to 2000 growth rate: 20%.
- 2000 to 2006 growth rate 3% (18,424 people).
Seattle
- Seattle currently has the second highest population with
32% of the total King County population.
- 1990 to 2000 growth rate: 9.1%
- 2000 to 2006 growth rate 2.6% (14,657 people)

Download Data | Source: Claritas 2006 Update (Census
Tract Level)
Demographic Data Sources
Our demographic data is based on secondary sources. The 2006
population estimates and five-year projections are compiled
using the 2006 Claritas data set. Other sources -- including the
2000 Decennial Census, 2006 American Community Survey and the Office of the Superintendent of
Public Instruction, Washington -- are used to add context and
expand upon the core data set.
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