Last official estimated population of Morrow County was 11,200 (year 2014)[1]. This was 0.004% of total US population and 0.3% of total Oregon state population. Area of Morrow County is 2,048.5 mi² (=5305.7 km²), in this year population density was 5.47 p/mi². If population growth rate would be same as in period 2010-2014 (+0.06%/yr), Morrow County population in 2025 would be 11,275 [0].
Historical population of Morrow 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] -0.13 %/yr
[1900-1910] +0.49 %/yr
[1910-1920] +2.57 %/yr
[1920-1930] -1.27 %/yr
[1930-1940] -1.3 %/yr
[1940-1950] +0.98 %/yr
[1950-1960] +0.18 %/yr
[1960-1970] -0.87 %/yr
[1970-1980] +5.35 %/yr
[1980-1990] +0.14 %/yr
[1990-2000] +3.73 %/yr
[2000-2005] +0.3 %/yr
[2005-2010] +0.02 %/yr
[2010-2014] +0.06 %/yr
Looking for settlements in Morrow County? Visit this page: Settlements in Morrow County, OR
Population of Morrow County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 413 | 375 | 788 |
| 5 to 9 | 455 | 417 | 872 |
| 10 to 14 | 468 | 433 | 901 |
| 15 to 19 | 461 | 420 | 881 |
| 20 to 24 | 379 | 300 | 679 |
| 25 to 29 | 257 | 299 | 556 |
| 30 to 34 | 322 | 302 | 624 |
| 35 to 39 | 333 | 308 | 641 |
| 40 to 44 | 352 | 348 | 700 |
| 45 to 49 | 342 | 317 | 659 |
| 50 to 54 | 363 | 338 | 701 |
| 55 to 59 | 417 | 422 | 839 |
| 60 to 64 | 344 | 385 | 729 |
| 65 to 69 | 297 | 255 | 552 |
| 70 to 74 | 199 | 221 | 420 |
| 75 to 79 | 151 | 149 | 300 |
| 80 to 84 | 111 | 92 | 203 |
| 85+ | 69 | 73 | 142 |
Morrow 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 | 5515 | 5244 | 10,759 |
| WA | 5389 | 5108 | 10,497 |
| NH | 3645 | 3611 | 7,256 |
| NHWAC | 3510 | 3469 | 6,979 |
| NHWA | 3411 | 3370 | 6,781 |
| H | 2088 | 1843 | 3,931 |
| HWAC | 2005 | 1775 | 3,780 |
| HWA | 1978 | 1738 | 3,716 |
| IAC | 178 | 180 | 358 |
| TOM | 135 | 139 | 274 |
| NHIAC | 119 | 115 | 234 |
| NHTOM | 106 | 102 | 208 |
| IA | 107 | 95 | 202 |
| BAC | 97 | 69 | 166 |
| HIAC | 59 | 65 | 124 |
| AAC | 53 | 68 | 121 |
| NHIA | 61 | 54 | 115 |
| BA | 60 | 44 | 104 |
| NHAAC | 43 | 60 | 103 |
| NHBAC | 58 | 42 | 100 |
| HIA | 46 | 41 | 87 |
| AA | 30 | 45 | 75 |
| NHAA | 27 | 42 | 69 |
| HBAC | 39 | 27 | 66 |
| HTOM | 29 | 37 | 66 |
| NAC | 29 | 35 | 64 |
| NHBA | 31 | 24 | 55 |
| NHNAC | 24 | 29 | 53 |
| HBA | 29 | 20 | 49 |
| NA | 12 | 23 | 35 |
| NHNA | 9 | 19 | 28 |
| HAAC | 10 | 8 | 18 |
| HNAC | 5 | 6 | 11 |
| HNA | 3 | 4 | 7 |
| HAA | 3 | 3 | 6 |
• Benton County population
55.6 mi, 
4°
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43.6 mi, 
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78.7 mi, 
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• Union County
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• Wasco County
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• Klickitat County
64.6 mi, 
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• Gilliam County
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• Sherman County
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• Wheeler County
51.9 mi, 
203°
[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
*Umatilla, Wasco Oregon Notes
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