Last official estimated population of Gilliam County was 1,870 (year 2014)[1]. This was 0.001% of total US population and 0% of total Oregon state population. Area of Gilliam County is 1,222.8 mi² (=3167.1 km²), in this year population density was 1.53 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Gilliam County population in 2025 would be 1,867 [0].
Historical population of Gilliam County for period 1890-2014 [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
[1890-1900] -1.17 %/yr
[1900-1910] +1.46 %/yr
[1910-1920] +0.68 %/yr
[1920-1930] -1.32 %/yr
[1930-1940] -1.96 %/yr
[1940-1950] -0.1 %/yr
[1950-1960] +0.86 %/yr
[1960-1970] -2.67 %/yr
[1970-1980] -1.29 %/yr
[1980-1990] -1.79 %/yr
[1990-2000] +1.07 %/yr
[2000-2005] -0.5 %/yr
[2005-2010] +0.09 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Gilliam County? Visit this page: Settlements in Gilliam County, OR
Population of Gilliam County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 55 | 62 | 117 |
| 5 to 9 | 53 | 51 | 104 |
| 10 to 14 | 49 | 48 | 97 |
| 15 to 19 | 58 | 39 | 97 |
| 20 to 24 | 49 | 29 | 78 |
| 25 to 29 | 42 | 37 | 79 |
| 30 to 34 | 40 | 44 | 84 |
| 35 to 39 | 50 | 55 | 105 |
| 40 to 44 | 49 | 51 | 100 |
| 45 to 49 | 57 | 44 | 101 |
| 50 to 54 | 68 | 82 | 150 |
| 55 to 59 | 99 | 78 | 177 |
| 60 to 64 | 92 | 85 | 177 |
| 65 to 69 | 73 | 62 | 135 |
| 70 to 74 | 46 | 60 | 106 |
| 75 to 79 | 40 | 55 | 95 |
| 80 to 84 | 22 | 27 | 49 |
| 85+ | 26 | 55 | 81 |
Gilliam 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 | 937 | 936 | 1,873 |
| WA | 916 | 921 | 1,837 |
| NH | 904 | 903 | 1,807 |
| NHWAC | 875 | 877 | 1,752 |
| NHWA | 856 | 865 | 1,721 |
| H | 64 | 61 | 125 |
| HWAC | 62 | 59 | 121 |
| HWA | 60 | 56 | 116 |
| IAC | 27 | 17 | 44 |
| NHIAC | 24 | 16 | 40 |
| TOM | 22 | 16 | 38 |
| NHTOM | 20 | 13 | 33 |
| IA | 17 | 10 | 27 |
| NHIA | 15 | 10 | 25 |
| AAC | 11 | 10 | 21 |
| NHAAC | 11 | 8 | 19 |
| NHNAC | 8 | 9 | 17 |
| NAC | 8 | 9 | 17 |
| BAC | 7 | 8 | 15 |
| NHNA | 5 | 9 | 14 |
| NA | 5 | 9 | 14 |
| NHBAC | 6 | 6 | 12 |
| AA | 6 | 6 | 12 |
| NHAA | 6 | 4 | 10 |
| HTOM | 2 | 3 | 5 |
| HIAC | 3 | 1 | 4 |
| NHBA | 2 | 2 | 4 |
| BA | 2 | 2 | 4 |
| HBAC | 1 | 2 | 3 |
| HIA | 2 | 0 | 2 |
| HAAC | 0 | 2 | 2 |
| HAA | 0 | 2 | 2 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Yakima County population
77.5 mi, 
343°
• Benton County
68.9 mi, 
32°
• Umatilla County
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• Wasco County
45.8 mi, 
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• Hood River County
67.5 mi, 
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• Jefferson County
67.4 mi, 
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• Klickitat County
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• Morrow County
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• Sherman County
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• Wheeler County
46.3 mi, 
164°
[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
*Wasco, Umatilla Oregon Notes
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