Last official estimated population of Benton County was 85,531 (year 2014)[1]. This was 0.027% of total US population and 2.1% of total Oregon state population. Area of Benton County is 678.6 mi² (=1757.6 km²), in this year population density was 126.04 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Benton County population in 2026 would be 85,387 [0].
Historical population of Benton County for period 1850-2014 [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
[1850-1860] +14.21 %/yr
[1860-1870] +4.08 %/yr
[1870-1880] +3.4 %/yr
[1880-1890] +3.05 %/yr
[1890-1900] -2.51 %/yr
[1900-1910] +4.75 %/yr
[1910-1920] +2.57 %/yr
[1920-1930] +1.88 %/yr
[1930-1940] +1.19 %/yr
[1940-1950] +5.42 %/yr
[1950-1960] +2.18 %/yr
[1960-1970] +3.22 %/yr
[1970-1980] +2.41 %/yr
[1980-1990] +0.37 %/yr
[1990-2000] +0.99 %/yr
[2000-2005] +0.71 %/yr
[2005-2010] +1.12 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Benton County? Visit this page: Settlements in Benton County, OR
Population of Benton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1824 | 1755 | 3,579 |
| 5 to 9 | 2019 | 1993 | 4,012 |
| 10 to 14 | 2085 | 2163 | 4,248 |
| 15 to 19 | 3912 | 3738 | 7,650 |
| 20 to 24 | 7816 | 6738 | 14,554 |
| 25 to 29 | 3339 | 2845 | 6,184 |
| 30 to 34 | 2566 | 2384 | 4,950 |
| 35 to 39 | 2129 | 2094 | 4,223 |
| 40 to 44 | 2135 | 2172 | 4,307 |
| 45 to 49 | 2051 | 2133 | 4,184 |
| 50 to 54 | 2388 | 2591 | 4,979 |
| 55 to 59 | 2547 | 2957 | 5,504 |
| 60 to 64 | 2752 | 2815 | 5,567 |
| 65 to 69 | 2170 | 2131 | 4,301 |
| 70 to 74 | 1367 | 1520 | 2,887 |
| 75 to 79 | 896 | 1053 | 1,949 |
| 80 to 84 | 661 | 821 | 1,482 |
| 85+ | 622 | 1134 | 1,756 |
Benton 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 |
| NH | 40184 | 40063 | 80,247 |
| WAC | 39498 | 39485 | 78,983 |
| WA | 38066 | 38052 | 76,118 |
| NHWAC | 36683 | 36746 | 73,429 |
| NHWA | 35402 | 35439 | 70,841 |
| AAC | 3330 | 3288 | 6,618 |
| NHAAC | 3235 | 3216 | 6,451 |
| H | 3095 | 2974 | 6,069 |
| HWAC | 2815 | 2739 | 5,554 |
| HWA | 2664 | 2613 | 5,277 |
| AA | 2599 | 2538 | 5,137 |
| NHAA | 2553 | 2505 | 5,058 |
| TOM | 1520 | 1549 | 3,069 |
| NHTOM | 1359 | 1409 | 2,768 |
| IAC | 907 | 940 | 1,847 |
| BAC | 912 | 700 | 1,612 |
| NHBAC | 799 | 622 | 1,421 |
| NHIAC | 678 | 731 | 1,409 |
| BA | 600 | 386 | 986 |
| NHBA | 529 | 341 | 870 |
| IA | 383 | 400 | 783 |
| NAC | 270 | 283 | 553 |
| NHIA | 241 | 268 | 509 |
| NHNAC | 243 | 259 | 502 |
| HIAC | 229 | 209 | 438 |
| HTOM | 161 | 140 | 301 |
| HIA | 142 | 132 | 274 |
| NA | 111 | 112 | 223 |
| NHNA | 100 | 101 | 201 |
| HBAC | 113 | 78 | 191 |
| HAAC | 95 | 72 | 167 |
| HBA | 71 | 45 | 116 |
| HAA | 46 | 33 | 79 |
| HNAC | 27 | 24 | 51 |
| HNA | 11 | 11 | 22 |
• Washington County population
74.9 mi, 
12°
• Clackamas County
75.8 mi, 
52°
• Lane County
47 mi, 
146°
• Marion County
50.3 mi, 
55°
• Linn County
43.7 mi, 
90°
• Douglas County
84.5 mi, 
170°
• Yamhill County
52.4 mi, 5°
• Polk County
28.1 mi, 
2°
• Lincoln County
26 mi, 
293°
• Tillamook County
68.4 mi, 
346°
[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
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