Last official estimated population of Benton County was 176,456 (year 2014)[1]. This was 0.055% of total US population and 2.5% of total Washington state population. Area of Benton County is 1,760.0 mi² (=4558.4 km²), in this year population density was 100.26 p/mi². If population growth rate would be same as in period 2010-2014 (+0.18%/yr), Benton County population in 2025 would be 180,022 [0].
Historical population of Benton County for period 1910-2014 [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

[1910-1920] +3.23 %/yr
[1920-1930] +0.04 %/yr
[1930-1940] +0.96 %/yr
[1940-1950] +15.6 %/yr
[1950-1960] +1.91 %/yr
[1960-1970] +0.85 %/yr
[1970-1980] +4.95 %/yr
[1980-1990] +0.28 %/yr
[1990-2000] +2.38 %/yr
[2000-2005] +2.05 %/yr
[2005-2010] +2.12 %/yr
[2010-2014] +0.18 %/yr
Looking for settlements in Benton County? Visit this page: Settlements in Benton County, WA
Population of Benton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 6862 | 6637 | 13,499 |
| 5 to 9 | 7129 | 6850 | 13,979 |
| 10 to 14 | 7142 | 6738 | 13,880 |
| 15 to 19 | 6793 | 6072 | 12,865 |
| 20 to 24 | 6307 | 5932 | 12,239 |
| 25 to 29 | 6309 | 6091 | 12,400 |
| 30 to 34 | 6562 | 6247 | 12,809 |
| 35 to 39 | 5757 | 5562 | 11,319 |
| 40 to 44 | 5482 | 5502 | 10,984 |
| 45 to 49 | 5551 | 5704 | 11,255 |
| 50 to 54 | 6203 | 6402 | 12,605 |
| 55 to 59 | 6225 | 6264 | 12,489 |
| 60 to 64 | 5626 | 5555 | 11,181 |
| 65 to 69 | 4355 | 4428 | 8,783 |
| 70 to 74 | 2969 | 3137 | 6,106 |
| 75 to 79 | 1949 | 2217 | 4,166 |
| 80 to 84 | 1237 | 1609 | 2,846 |
| 85+ | 1104 | 1977 | 3,081 |
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 |
| WAC | 87717 | 87165 | 174,882 |
| WA | 85138 | 84653 | 169,791 |
| NH | 74133 | 74259 | 148,392 |
| NHWAC | 69356 | 69494 | 138,850 |
| NHWA | 67280 | 67496 | 134,776 |
| H | 19429 | 18665 | 38,094 |
| HWAC | 18361 | 17671 | 36,032 |
| HWA | 17858 | 17157 | 35,015 |
| AAC | 3491 | 3855 | 7,346 |
| NHAAC | 3204 | 3547 | 6,751 |
| AA | 2566 | 2974 | 5,540 |
| TOM | 2724 | 2661 | 5,385 |
| NHAA | 2409 | 2803 | 5,212 |
| BAC | 2599 | 2137 | 4,736 |
| IAC | 2264 | 2252 | 4,516 |
| NHTOM | 2170 | 2101 | 4,271 |
| NHBAC | 2160 | 1705 | 3,865 |
| BA | 1733 | 1310 | 3,043 |
| NHIAC | 1449 | 1485 | 2,934 |
| NHBA | 1466 | 1047 | 2,513 |
| IA | 1193 | 1149 | 2,342 |
| HIAC | 815 | 767 | 1,582 |
| NHIA | 678 | 688 | 1,366 |
| HTOM | 554 | 560 | 1,114 |
| HIA | 515 | 461 | 976 |
| HBAC | 439 | 432 | 871 |
| NAC | 402 | 360 | 762 |
| HAAC | 287 | 308 | 595 |
| NHNAC | 282 | 269 | 551 |
| HBA | 267 | 263 | 530 |
| NA | 208 | 177 | 385 |
| HAA | 157 | 171 | 328 |
| NHNA | 130 | 124 | 254 |
| HNAC | 120 | 91 | 211 |
| HNA | 78 | 53 | 131 |
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[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
*Yakima, Klickitat Washington Notes
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