Last official estimated population of Knox County was 4,125 (year 2014)[1]. This was 0.001% of total US population and 0.1% of total Missouri state population. Area of Knox County is 506.8 mi² (=1312.7 km²), in this year population density was 8.14 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Knox County population in 2026 would be 4,107 [0].
Historical population of Knox 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] +11.67 %/yr
[1860-1870] +2.32 %/yr
[1870-1880] +1.75 %/yr
[1880-1890] +0.34 %/yr
[1890-1900] -0.02 %/yr
[1900-1910] -0.83 %/yr
[1910-1920] -1.39 %/yr
[1920-1930] -1.1 %/yr
[1930-1940] -0.84 %/yr
[1940-1950] -1.52 %/yr
[1950-1960] -1.49 %/yr
[1960-1970] -1.41 %/yr
[1970-1980] -0.33 %/yr
[1980-1990] -2.04 %/yr
[1990-2000] -0.28 %/yr
[2000-2005] -0.8 %/yr
[2005-2010] -0.27 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Knox County? Visit this page: Settlements in Knox County, MO
Population of Knox County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 139 | 133 | 272 |
| 5 to 9 | 126 | 125 | 251 |
| 10 to 14 | 142 | 115 | 257 |
| 15 to 19 | 145 | 132 | 277 |
| 20 to 24 | 120 | 94 | 214 |
| 25 to 29 | 86 | 102 | 188 |
| 30 to 34 | 110 | 99 | 209 |
| 35 to 39 | 77 | 89 | 166 |
| 40 to 44 | 114 | 115 | 229 |
| 45 to 49 | 112 | 116 | 228 |
| 50 to 54 | 151 | 156 | 307 |
| 55 to 59 | 165 | 146 | 311 |
| 60 to 64 | 126 | 124 | 250 |
| 65 to 69 | 118 | 133 | 251 |
| 70 to 74 | 96 | 113 | 209 |
| 75 to 79 | 68 | 86 | 154 |
| 80 to 84 | 35 | 70 | 105 |
| 85+ | 50 | 72 | 122 |
Knox 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 | 1959 | 1998 | 3,957 |
| NH | 1962 | 1989 | 3,951 |
| NHWAC | 1941 | 1967 | 3,908 |
| WA | 1921 | 1976 | 3,897 |
| NHWA | 1903 | 1946 | 3,849 |
| TOM | 40 | 22 | 62 |
| NHTOM | 40 | 21 | 61 |
| BAC | 26 | 23 | 49 |
| H | 18 | 31 | 49 |
| HWAC | 18 | 31 | 49 |
| NHBAC | 26 | 22 | 48 |
| HWA | 18 | 30 | 48 |
| NHIAC | 30 | 14 | 44 |
| IAC | 30 | 14 | 44 |
| BA | 8 | 11 | 19 |
| NHBA | 8 | 11 | 19 |
| AAC | 10 | 8 | 18 |
| NHAAC | 10 | 8 | 18 |
| NHIA | 7 | 4 | 11 |
| IA | 7 | 4 | 11 |
| AA | 4 | 7 | 11 |
| NHAA | 4 | 7 | 11 |
| NAC | 2 | 0 | 2 |
| NHNAC | 2 | 0 | 2 |
| HBAC | 0 | 1 | 1 |
| HTOM | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HIA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HIAC | 0 | 0 | 0 |
• Marion County population
35.4 mi,
130°
• Adair County
24.4 mi,
278°
• Macon County
30.6 mi,
226°
• Lewis County
22.4 mi,
99°
• Davis County
44.5 mi,
341°
• Van Buren County
43.9 mi,
13°
• Clark County
28.9 mi,
49°
• Shelby County
23.6 mi,
172°
• Scotland County
21.5 mi,
0°
• Schuyler County
30.2 mi,
319°
[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
*Lewis, Shelby, Macon Missouri Notes
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