Last official estimated population of Knox County was 38,383 (year 2014)[1]. This was 0.012% of total US population and 0.6% of total Indiana state population. Area of Knox County is 524.0 mi² (=1357.3 km²), in this year population density was 73.24 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Knox County population in 2024 would be 38,241 [0].
Historical population of Knox County for period 1800-2014 [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
[1800-1810] +12.18 %/yr
[1810-1820] -3.72 %/yr
[1820-1830] +1.84 %/yr
[1830-1840] +5.03 %/yr
[1840-1850] +0.39 %/yr
[1850-1860] +3.78 %/yr
[1860-1870] +2.99 %/yr
[1870-1880] +2.02 %/yr
[1880-1890] +0.63 %/yr
[1890-1900] +1.56 %/yr
[1900-1910] +1.81 %/yr
[1910-1920] +1.66 %/yr
[1920-1930] -0.53 %/yr
[1930-1940] +0.04 %/yr
[1940-1950] -0.13 %/yr
[1950-1960] -0.44 %/yr
[1960-1970] -0 %/yr
[1970-1980] +0.07 %/yr
[1980-1990] -0.48 %/yr
[1990-2000] -0.16 %/yr
[2000-2005] -0.37 %/yr
[2005-2010] -0.05 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Knox County? Visit this page: Settlements in Knox County, IN
Population of Knox County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1247 | 1121 | 2,368 |
| 5 to 9 | 1113 | 1069 | 2,182 |
| 10 to 14 | 1071 | 1064 | 2,135 |
| 15 to 19 | 1775 | 1416 | 3,191 |
| 20 to 24 | 1986 | 1406 | 3,392 |
| 25 to 29 | 1177 | 988 | 2,165 |
| 30 to 34 | 1167 | 1071 | 2,238 |
| 35 to 39 | 1006 | 950 | 1,956 |
| 40 to 44 | 1020 | 1041 | 2,061 |
| 45 to 49 | 1130 | 1017 | 2,147 |
| 50 to 54 | 1379 | 1358 | 2,737 |
| 55 to 59 | 1320 | 1351 | 2,671 |
| 60 to 64 | 1167 | 1191 | 2,358 |
| 65 to 69 | 916 | 1042 | 1,958 |
| 70 to 74 | 670 | 848 | 1,518 |
| 75 to 79 | 535 | 653 | 1,188 |
| 80 to 84 | 295 | 528 | 823 |
| 85+ | 246 | 604 | 850 |
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 |
| NH | 18827 | 18417 | 37,244 |
| WAC | 18307 | 17990 | 36,297 |
| WA | 18083 | 17771 | 35,854 |
| NHWAC | 17946 | 17719 | 35,665 |
| NHWA | 17733 | 17508 | 35,241 |
| BAC | 798 | 640 | 1,438 |
| NHBAC | 782 | 620 | 1,402 |
| BA | 677 | 507 | 1,184 |
| NHBA | 667 | 490 | 1,157 |
| H | 393 | 301 | 694 |
| HWAC | 361 | 271 | 632 |
| HWA | 350 | 263 | 613 |
| TOM | 239 | 224 | 463 |
| NHTOM | 227 | 216 | 443 |
| AAC | 191 | 200 | 391 |
| NHAAC | 186 | 198 | 384 |
| AA | 148 | 173 | 321 |
| NHAA | 146 | 172 | 318 |
| IAC | 153 | 109 | 262 |
| NHIAC | 130 | 93 | 223 |
| IA | 64 | 37 | 101 |
| NHIA | 46 | 25 | 71 |
| HIAC | 23 | 16 | 39 |
| HBAC | 16 | 20 | 36 |
| NAC | 19 | 13 | 32 |
| HIA | 18 | 12 | 30 |
| NHNAC | 17 | 13 | 30 |
| HBA | 10 | 17 | 27 |
| HTOM | 12 | 8 | 20 |
| NA | 9 | 6 | 15 |
| NHNA | 8 | 6 | 14 |
| HAAC | 5 | 2 | 7 |
| HAA | 2 | 1 | 3 |
| HNAC | 2 | 0 | 2 |
| HNA | 1 | 0 | 1 |
• Gibson County population
27.1 mi, 
198°
• Greene County
33.4 mi, 
42°
• Daviess County
18.7 mi, 
88°
• Sullivan County
27.7 mi, 
0°
• Crawford County
28.4 mi, 
319°
• Lawrence County
16.8 mi, 
277°
• Richland County
35.9 mi, 
272°
• Pike County
22.5 mi, 
153°
• Wabash County
28.2 mi, 
233°
• Martin County
33.4 mi, 87°
[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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