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					Estimates of April 1 Population Density and Land Area by County
Washington State Office of Financial Management, Forecasting Division

The table contained herein provides information on population density and land area by county for the State of Washington.


Notes

1. Population density is measured in persons per square mile.

2. The land area measurement excludes lakes and other water areas within.

3. The land area measurements used to calculate population density were derived from the following sources:
    • 1900-1990: U.S. Census Bureau, Land area, population, and density for states and counties: 1990
      [http://www.census.gov/population/censusdata/90den_stco.txt] with adjustments for Yakima and Klickitat counties in
      1900 and Stevens County in 1900 and 1910.
    • 2000 - 2009: U.S. Census Bureau, 2000 Census Redistricting Data (Public Law 94-171) Summary File.
    • 2010 - present: U.S. Census Bureau, 2010 Census Redistricting Data (Public Law 94-171) Summary File.

4. The 2000 and 2010 population values used to calculate population density represent OFM-adjusted federal census counts.
The adjustments include: 1) controlling for annexations occurring between January 1 and April 1 to account for boundary
changes related to the timing of the federal census, 2) the substitution of state-certified special census counts in place of
federal census counts, and 3) federal corrections to census counts.

5. The 2001-2009 population density estimates were derived from OFM's April 1 intercensal population estimate series.

6. Clark County was originally created as Vancouver District in 1845. However, the first board of county government was
organized in 1850 after the 1849 Oregon Territorial legislature changed the name to Clark from Vancouver. The date of
formation for Spokane County is the date when it regained separate county status after having been merged with Stevens
County.


File last updated on 2011-11-15.
Estimates of April 1 Population Density and Land Area by County
Washington State Office of Financial Management, Forecasting Division

Population density is measured in persons per square mile.


                              Year of      Land Area       Land Area       Land Area    Population    Population    Population    Population    Population    Population    Population
County Name                 Formation (sq. mi.), 1990 (sq. mi.), 2000 (sq. mi.), 2010 Density, 1900 Density, 1910 Density, 1920 Density, 1930 Density, 1940 Density, 1950 Density, 1960
Washington State                1889        66,581.2        66,544.1        66,455.5           7.78         17.15         20.38         23.48         26.08         35.73         42.85
Adams                           1883         1,925.0         1,925.0         1,925.0           2.51          5.67          5.00          4.01           3.23         3.42          5.16
Asotin                          1883            635.9           635.3           636.2          5.29          9.17         10.28         12.79         13.15         17.11         20.30
Benton                          1905         1,703.1         1,703.1         1,700.4              .          4.66          6.40          6.43           7.08        30.16         36.45
Chelan                          1899         2,921.6         2,921.4         2,920.5           1.35          5.17          7.16         10.83         11.78         13.45         13.95
Clallam                         1854         1,745.2         1,739.5         1,738.3           3.21          3.87          6.51         11.72         12.52         15.12         17.20
Clark                           1849            627.9           628.2           629.0         21.37         41.59         52.25         64.21         79.39       135.86        149.40
Columbia                        1875            868.8           868.8           868.6          8.20          8.11          7.01          6.13           6.39         5.59          5.26
Cowlitz                         1854         1,138.7         1,138.6         1,140.1           6.92         11.03         10.35         28.02         35.26         46.87         50.76
Douglas                         1883         1,820.6         1,820.5         1,819.3           1.10          5.07          5.16          4.15           4.75         5.94          8.18
Ferry                           1899         2,204.0         2,204.0         2,203.2           2.07          2.18          2.33          1.95           2.13         1.86          1.76
Franklin                        1883         1,242.2         1,242.4         1,242.2           0.39          4.15          4.73          4.94           5.08        10.92         18.79
Garfield                        1881            710.5           710.6           710.7          5.51          5.91          5.45          5.15           4.76         4.51          4.19
Grant                           1909         2,676.4         2,681.1         2,679.5              .          3.25          2.90          2.12           5.48         9.10         17.37
Grays Harbor                    1854         1,917.3         1,916.9         1,902.0           7.89         18.56         23.34         31.28         27.73         27.98         28.41
Island                          1853            208.6           208.4           208.5          8.96         22.55         26.31         25.74         29.23         53.11         94.14
Jefferson                       1852         1,808.8         1,814.2         1,803.7           3.16          4.61          3.63          4.61           4.93         6.42          5.33
King                            1852         2,126.1         2,126.0         2,115.6          51.76       133.88        183.09        218.01        237.51        344.76        439.78
Kitsap                          1857            396.0           396.0           394.9         17.09         44.56         83.74         77.72       112.09        191.22        212.57
Kittitas                        1883         2,296.7         2,297.2         2,297.3           4.23          8.08          7.72          7.90           8.81         9.68          8.91
Klickitat                       1859         1,872.5         1,872.4         1,871.3           2.88          5.44          4.95          5.25           6.07         6.43          7.19
Lewis                           1845         2,407.8         2,407.6         2,402.8           6.29         13.34         15.30         16.63         17.19         18.17         17.38
Lincoln                         1883         2,311.2         2,311.2         2,310.5           5.18          7.59          6.55          5.14           4.92         4.75          4.72
Mason                           1854            961.1           961.1           959.4          3.96          5.36          5.12         10.47         12.07         15.63         16.91
Okanogan                        1888         5,268.3         5,268.1         5,268.0           0.89          2.45          3.24          3.52           4.66         5.53          4.84
Pacific                         1851            974.6           933.0           932.7          6.14         12.86         15.28         15.36         16.34         16.99         15.06
Pend Oreille                    1911         1,400.5         1,400.3         1,400.0              .             .          4.54          5.11           5.11         5.29          4.94
Pierce                          1852         1,675.5         1,678.9         1,669.5          33.13         72.11         86.02         97.79       108.67        164.65        191.94
San Juan                        1873            174.9           174.9           173.9         16.74         20.60         20.61         17.71         18.05         18.55         16.42
Skagit                          1883         1,735.3         1,735.1         1,731.2           8.22         16.85         19.23         20.25         21.70         24.94         29.59
Skamania                        1854         1,656.5         1,656.4         1,655.7           1.02          1.74          1.42          1.75           2.80         2.89          3.14
Snohomish                       1861         2,090.2         2,089.1         2,087.3          11.46         28.33         32.38         37.73         42.46         53.38         82.38
Spokane                         1879         1,763.8         1,763.6         1,763.8          32.62         79.04         80.10         85.31         93.35       125.62        157.80
Stevens                         1863         2,478.3         2,478.3         2,477.8           2.72          6.52          8.72          7.48           7.78         7.50          7.22
Thurston                        1852            727.1           727.0           722.0         13.65         24.18         30.76         43.12         51.28         61.73         75.71
Wahkiakum                       1854            264.3           264.2           263.4         10.67         12.43         13.14         14.61         16.22         14.51         12.96
Walla Walla                     1854         1,270.5         1,270.5         1,270.1          14.70         25.13         21.68         22.39         24.04         31.59         33.21
Whatcom                         1854         2,120.1         2,119.5         2,106.9          11.37         23.35         23.87         27.89         28.47         31.48         33.17
Whitman                         1871         2,159.4         2,159.4         2,159.1          11.74         15.41         14.51         12.97         12.61         15.04         14.48
Yakima                          1865         4,296.1         4,296.2         4,295.4           2.38          9.71         14.83         18.02         23.05         31.59         33.78
Estimates of April 1 Population Density and Land Area by County
Washington State Office of Financial Management, Forecasting Division

Population density is measured in persons per square mile.


                           Population    Population    Population    Population    Population    Population    Population    Population    Population    Population    Population
County Name              Density, 1970 Density, 1980 Density, 1990 Density, 2000 Density, 2001 Density, 2002 Density, 2003 Density, 2004 Density, 2005 Density, 2006 Density, 2007
Washington State                 47.21         62.06         73.09         88.58         89.72         91.06         92.07         93.30         94.66         96.48         98.06
Adams                             6.24          6.89          7.07          8.53          8.67          8.79          8.87          9.09           9.17         9.19          9.33
Asotin                           21.70         26.46         27.69         32.35         32.50         32.51         32.60         32.71         32.96         33.33         33.70
Benton                           39.66         64.26         66.09         83.66         85.30         87.07         89.21         91.52         93.53         95.27         96.94
Chelan                           14.15         15.42         17.88         22.80         22.90         23.07         23.11         23.28         23.61         23.93         24.23
Clallam                          19.92         29.59         32.20         36.90         37.21         37.60         37.90         38.36         38.90         39.64         40.15
Clark                          204.58        306.14        379.13        549.55        561.45        580.78        595.48        613.43        628.12        644.26        656.92
Columbia                          5.11          4.67          4.63          4.68          4.74          4.74          4.73          4.74           4.76         4.75          4.71
Cowlitz                          60.26         69.86         72.12         81.63         82.63         83.30         84.18         84.83         85.78         87.03         88.16
Douglas                           9.22         12.16         14.39         17.91         18.03         18.06         18.43         18.65         18.93         19.50         19.96
Ferry                             1.66          2.64          2.86          3.29          3.33          3.35          3.36          3.34           3.36         3.39          3.40
Franklin                         20.78         28.20         30.17         39.72         40.63         42.08         44.19         47.15         50.36         53.42         56.01
Garfield                          4.10          3.47          3.16          3.37          3.35          3.33          3.30          3.27           3.26         3.25          3.22
Grant                            15.65         18.13         20.47         27.86         28.31         28.70         28.90         29.46         29.88         30.51         31.23
Grays Harbor                     31.06         34.59         33.47         35.05         35.84         36.12         36.23         36.55         36.94         37.34         37.58
Island                         129.49        211.16        288.57        343.32        345.74        350.96        353.26        357.67        364.40        370.34        375.31
Jefferson                         5.89          8.83         11.28         14.50         14.70         14.96         15.07         15.29         15.63         15.90         16.12
King                           544.02        597.29        708.95        817.03        825.71        836.07        841.04        847.01        853.70        867.91        880.09
Kitsap                         256.90        371.60        479.12        585.82        590.75        597.66        604.70        608.07        605.65        616.33        624.99
Kittitas                         10.90         10.83         11.64         14.52         14.77         15.02         15.44         16.01         16.39         16.62         17.04
Klickitat                         6.48          8.45          8.87         10.23         10.30         10.34         10.39         10.50         10.55         10.67         10.74
Lewis                            18.88         23.27         24.65         28.49         28.81         29.11         29.24         29.52         29.81         30.34         30.75
Lincoln                           4.14          4.16          3.84          4.41          4.46          4.45          4.39          4.46           4.49         4.51          4.56
Mason                            21.76         32.45         39.89         51.41         52.00         53.05         54.07         55.39         56.96         58.49         60.42
Okanogan                          4.91          5.82          6.33          7.51          7.56          7.59          7.59          7.62           7.64         7.72          7.67
Pacific                          16.21         17.69         19.37         22.49         22.46         22.37         22.15         22.15         22.16         22.41         22.28
Pend Oreille                      4.30          6.13          6.37          8.38          8.56          8.57          8.63          8.69           8.82         8.93          9.04
Pierce                         245.32        289.86        349.87        417.42        422.47        429.52        435.98        442.97        450.84        461.04        468.70
San Juan                         22.05         44.81         57.38         80.48         82.33         83.83         84.45         85.38         86.78         87.92         88.51
Skagit                           30.19         36.96         45.84         59.35         60.08         61.01         61.46         62.53         63.38         64.61         65.64
Skamania                          3.53          4.78          5.00          5.96          6.00          6.06          6.11          6.21           6.35         6.51          6.58
Snohomish                      126.90        161.57        222.77        290.09        295.76        301.23        306.33        310.56        316.58        323.65        329.96
Spokane                        162.99        193.81        204.86        236.98        239.92        243.11        243.18        244.89        248.49        253.31        257.44
Stevens                           7.02         11.69         12.49         16.17         16.27         16.39         16.53         16.68         16.86         17.09         17.25
Thurston                       105.75        170.90        221.75        285.21        288.99        294.54        300.22        306.82        315.38        321.98        329.52
Wahkiakum                        13.59         14.50         12.59         14.47         14.50         14.48         14.51         14.48         14.63         14.80         15.00
Walla Walla                      33.20         37.34         38.13         43.43         43.37         43.48         43.73         44.21         44.87         45.04         45.46
Whatcom                          38.65         50.33         60.27         78.71         80.67         82.21         83.03         85.04         87.27         89.68         92.14
Whitman                          17.55         18.57         17.96         18.87         18.68         18.82         18.97         19.30         19.68         19.84         19.82
Yakima                           33.80         40.15         43.95         51.81         52.19         52.32         53.06         53.54         53.98         54.56         55.15
Estimates of April 1 Population Density and Land Area by County
Washington State Office of Financial Management, Forecasting Division

Population density is measured in persons per square mile.


                           Population    Population    Population    Population
County Name              Density, 2008 Density, 2009 Density, 2010 Density, 2011
Washington State                 99.31       100.27        101.19        101.84
Adams                             9.46          9.57          9.73          9.84
Asotin                           33.87         33.99         33.99         34.03
Benton                           98.41       100.64        103.02        104.62
Chelan                           24.58         24.71         24.81         24.89
Clallam                          40.60         40.83         41.08         41.19
Clark                          667.11        674.56        676.25        680.45
Columbia                          4.72          4.72          4.69          4.72
Cowlitz                          89.18         89.73         89.82         90.08
Douglas                          20.45         20.89         21.12         21.24
Ferry                             3.42          3.43          3.43          3.45
Franklin                         58.14         60.46         62.92         64.81
Garfield                          3.21          3.20          3.19          3.17
Grant                            32.07         32.72         33.26         33.63
Grays Harbor                     37.71         37.86         38.27         38.33
Island                         376.84        377.76        376.62        378.03
Jefferson                        16.33         16.41         16.56         16.66
King                           889.51        898.01        912.87        918.24
Kitsap                         631.12        634.52        635.88        642.88
Kittitas                         17.47         17.72         17.81         17.98
Klickitat                        10.80         10.82         10.86         10.95
Lewis                            31.09         31.28         31.40         31.63
Lincoln                           4.60          4.60          4.57          4.59
Mason                            61.95         62.68         63.27         63.68
Okanogan                          7.70          7.78          7.81          7.82
Pacific                          22.24         22.39         22.43         22.41
Pend Oreille                      9.18          9.17          9.29          9.29
Pierce                         473.12        474.65        476.32        480.47
San Juan                         89.38         89.97         90.67         91.43
Skagit                           66.52         67.21         67.53         67.81
Skamania                          6.61          6.64          6.68          6.73
Snohomish                      334.76        337.90        341.76        343.51
Spokane                        261.00        264.47        267.16        267.97
Stevens                          17.46         17.56         17.57         17.60
Thurston                       336.79        342.96        349.42        351.96
Wahkiakum                        15.16         15.15         15.10         15.19
Walla Walla                      45.70         46.09         46.28         46.29
Whatcom                          93.26         94.24         95.47         95.92
Whitman                          20.41         20.38         20.74         20.75
Yakima                           55.75         56.26         56.63         56.97

				
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