Last official estimated population of Benton County was 19,119 (year 2014)[1]. This was 0.006% of total US population and 0.3% of total Missouri state population. Area of Benton County is 752.5 mi² (=1949 km²), in this year population density was 25.41 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Benton County population in 2026 would be 19,309 [0].
Historical population of Benton County for period 1840-2014 [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
[1840-1850] +1.78 %/yr
[1850-1860] +6.11 %/yr
[1860-1870] +2.24 %/yr
[1870-1880] +0.91 %/yr
[1880-1890] +1.91 %/yr
[1890-1900] +1.01 %/yr
[1900-1910] -1.06 %/yr
[1910-1920] -1.35 %/yr
[1920-1930] -1.03 %/yr
[1930-1940] -0.49 %/yr
[1940-1950] -2.03 %/yr
[1950-1960] -0.38 %/yr
[1960-1970] +1.05 %/yr
[1970-1980] +2.31 %/yr
[1980-1990] +1.3 %/yr
[1990-2000] +2.15 %/yr
[2000-2005] +1.74 %/yr
[2005-2010] +0.39 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Benton County? Visit this page: Settlements in Benton County, MO
Population of Benton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 395 | 337 | 732 |
| 5 to 9 | 487 | 429 | 916 |
| 10 to 14 | 511 | 484 | 995 |
| 15 to 19 | 531 | 447 | 978 |
| 20 to 24 | 384 | 374 | 758 |
| 25 to 29 | 354 | 331 | 685 |
| 30 to 34 | 382 | 388 | 770 |
| 35 to 39 | 362 | 393 | 755 |
| 40 to 44 | 452 | 469 | 921 |
| 45 to 49 | 566 | 547 | 1,113 |
| 50 to 54 | 720 | 672 | 1,392 |
| 55 to 59 | 797 | 820 | 1,617 |
| 60 to 64 | 844 | 923 | 1,767 |
| 65 to 69 | 878 | 902 | 1,780 |
| 70 to 74 | 754 | 718 | 1,472 |
| 75 to 79 | 542 | 497 | 1,039 |
| 80 to 84 | 319 | 314 | 633 |
| 85+ | 183 | 300 | 483 |
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 | 9312 | 9190 | 18,502 |
| NH | 9268 | 9199 | 18,467 |
| WA | 9177 | 9074 | 18,251 |
| NHWAC | 9130 | 9055 | 18,185 |
| NHWA | 9005 | 8946 | 17,951 |
| H | 193 | 146 | 339 |
| HWAC | 182 | 135 | 317 |
| HWA | 172 | 128 | 300 |
| IAC | 152 | 136 | 288 |
| NHIAC | 143 | 123 | 266 |
| TOM | 137 | 122 | 259 |
| NHTOM | 126 | 115 | 241 |
| BAC | 76 | 62 | 138 |
| NHBAC | 71 | 59 | 130 |
| IA | 64 | 54 | 118 |
| AAC | 52 | 64 | 116 |
| NHAAC | 48 | 61 | 109 |
| NHIA | 60 | 48 | 108 |
| BA | 45 | 42 | 87 |
| NHBA | 45 | 40 | 85 |
| AA | 33 | 48 | 81 |
| NHAA | 30 | 45 | 75 |
| NAC | 9 | 16 | 25 |
| HIAC | 9 | 13 | 22 |
| NHNAC | 5 | 16 | 21 |
| HTOM | 11 | 7 | 18 |
| NA | 5 | 5 | 10 |
| HIA | 4 | 6 | 10 |
| HBAC | 5 | 3 | 8 |
| HAAC | 4 | 3 | 7 |
| NHNA | 2 | 5 | 7 |
| HAA | 3 | 3 | 6 |
| HNAC | 4 | 0 | 4 |
| HNA | 3 | 0 | 3 |
| HBA | 0 | 2 | 2 |
• Johnson County population
41.6 mi, 
317°
• Camden County
34.1 mi, 
123°
• Pettis County
29.5 mi, 
0°
• Henry County
28 mi, 
282°
• Morgan County
23.9 mi, 
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• Cooper County
45.5 mi, 
34°
• Dallas County
44.8 mi, 
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• Moniteau County
44.5 mi, 
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• St. Clair County
32 mi, 
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• Hickory County
25.2 mi, 
184°
[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
*Crawford, Saline, Cooper Missouri Notes
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