Last official estimated population of Columbia County was 4,112 (year 2014)[1]. This was 0.001% of total US population and 0.1% of total Washington state population. Area of Columbia County is 873.5 mi² (=2262.4 km²), in this year population density was 4.71 p/mi². If population growth rate would be same as in period 2010-2014 (+0.21%/yr), Columbia County population in 2024 would be 4,198 [0].
Historical population of Columbia County for period 1880-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1880-1890] -0.57 %/yr
[1890-1900] +0.61 %/yr
[1900-1910] -0.12 %/yr
[1910-1920] -1.44 %/yr
[1920-1930] -1.34 %/yr
[1930-1940] +0.41 %/yr
[1940-1950] -1.32 %/yr
[1950-1960] -0.62 %/yr
[1960-1970] -0.29 %/yr
[1970-1980] -0.9 %/yr
[1980-1990] -0.08 %/yr
[1990-2000] +0.1 %/yr
[2000-2005] -0.45 %/yr
[2005-2010] +0.52 %/yr
[2010-2014] +0.21 %/yr
Looking for settlements in Columbia County? Visit this page: Settlements in Columbia County, WA
Population of Columbia County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 83 | 64 | 147 |
| 5 to 9 | 106 | 100 | 206 |
| 10 to 14 | 112 | 115 | 227 |
| 15 to 19 | 117 | 133 | 250 |
| 20 to 24 | 96 | 82 | 178 |
| 25 to 29 | 79 | 73 | 152 |
| 30 to 34 | 93 | 107 | 200 |
| 35 to 39 | 102 | 83 | 185 |
| 40 to 44 | 98 | 96 | 194 |
| 45 to 49 | 119 | 115 | 234 |
| 50 to 54 | 147 | 153 | 300 |
| 55 to 59 | 145 | 140 | 285 |
| 60 to 64 | 176 | 189 | 365 |
| 65 to 69 | 158 | 167 | 325 |
| 70 to 74 | 144 | 144 | 288 |
| 75 to 79 | 103 | 86 | 189 |
| 80 to 84 | 52 | 60 | 112 |
| 85+ | 61 | 87 | 148 |
Columbia County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| WAC | 1926 | 1925 | 3,851 |
| WA | 1877 | 1884 | 3,761 |
| NH | 1868 | 1866 | 3,734 |
| NHWAC | 1812 | 1806 | 3,618 |
| NHWA | 1771 | 1774 | 3,545 |
| H | 123 | 128 | 251 |
| HWAC | 114 | 119 | 233 |
| HWA | 106 | 110 | 216 |
| IAC | 47 | 55 | 102 |
| TOM | 51 | 45 | 96 |
| NHIAC | 36 | 45 | 81 |
| NHTOM | 43 | 36 | 79 |
| IA | 29 | 35 | 64 |
| BAC | 32 | 29 | 61 |
| NHBAC | 27 | 25 | 52 |
| NHIA | 21 | 28 | 49 |
| AAC | 24 | 21 | 45 |
| NHAAC | 23 | 19 | 42 |
| AA | 12 | 15 | 27 |
| NHAA | 12 | 14 | 26 |
| BA | 15 | 9 | 24 |
| NHBA | 14 | 8 | 22 |
| NAC | 13 | 9 | 22 |
| HIAC | 11 | 10 | 21 |
| NHNAC | 13 | 7 | 20 |
| HTOM | 8 | 9 | 17 |
| HIA | 8 | 7 | 15 |
| NA | 7 | 6 | 13 |
| NHNA | 7 | 6 | 13 |
| HBAC | 5 | 4 | 9 |
| HAAC | 1 | 2 | 3 |
| HBA | 1 | 1 | 2 |
| HNAC | 0 | 2 | 2 |
| HAA | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Franklin County population
50.3 mi, 
289°
• Umatilla County
62.5 mi, 
219°
• Walla Walla County
27.3 mi, 
264°
• Whitman County
46 mi, 
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• Nez Perce County
55 mi, 
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• Latah County
66.8 mi, 
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• Asotin County
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• Adams County
57.2 mi, 
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• Wallowa County
59.6 mi, 
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• Garfield County
20.2 mi, 62°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Walla Walla Washington Notes
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