Last official estimated population of Knox County was 52,919 (year 2014)[1]. This was 0.017% of total US population and 0.4% of total Illinois state population. Area of Knox County is 719.8 mi² (=1864.3 km²), in this year population density was 73.52 p/mi². If population growth rate would be same as in period 2010-2014 (0%/yr), Knox County population in 2026 would be 52,919 [0].
Historical population of Knox County for period 1830-2014 [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
[1830-1840] +38.39 %/yr
[1840-1850] +6.52 %/yr
[1850-1860] +8 %/yr
[1860-1870] +3.26 %/yr
[1870-1880] -0.3 %/yr
[1880-1890] +0.11 %/yr
[1890-1900] +1.19 %/yr
[1900-1910] +0.57 %/yr
[1910-1920] +0.12 %/yr
[1920-1930] +0.95 %/yr
[1930-1940] +0.18 %/yr
[1940-1950] +0.4 %/yr
[1950-1960] +1.2 %/yr
[1960-1970] 0 %/yr
[1970-1980] +0.05 %/yr
[1980-1990] -0.88 %/yr
[1990-2000] -0.1 %/yr
[2000-2005] -0.85 %/yr
[2005-2010] -0.22 %/yr
[2010-2014] 0 %/yr
Looking for settlements in Knox County? Visit this page: Settlements in Knox County, IL
Population of Knox County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1277 | 1315 | 2,592 |
| 5 to 9 | 1409 | 1435 | 2,844 |
| 10 to 14 | 1592 | 1485 | 3,077 |
| 15 to 19 | 1730 | 1635 | 3,365 |
| 20 to 24 | 1941 | 1755 | 3,696 |
| 25 to 29 | 1718 | 1339 | 3,057 |
| 30 to 34 | 1661 | 1355 | 3,016 |
| 35 to 39 | 1675 | 1362 | 3,037 |
| 40 to 44 | 1573 | 1392 | 2,965 |
| 45 to 49 | 1602 | 1523 | 3,125 |
| 50 to 54 | 1842 | 1794 | 3,636 |
| 55 to 59 | 1812 | 1894 | 3,706 |
| 60 to 64 | 1828 | 1904 | 3,732 |
| 65 to 69 | 1446 | 1592 | 3,038 |
| 70 to 74 | 1112 | 1288 | 2,400 |
| 75 to 79 | 797 | 959 | 1,756 |
| 80 to 84 | 598 | 860 | 1,458 |
| 85+ | 554 | 1015 | 1,569 |
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 | 24532 | 24646 | 49,178 |
| WAC | 23083 | 24058 | 47,141 |
| WA | 22519 | 23457 | 45,976 |
| NHWAC | 21649 | 22926 | 44,575 |
| NHWA | 21166 | 22406 | 43,572 |
| BAC | 3120 | 1894 | 5,014 |
| NHBAC | 2956 | 1774 | 4,730 |
| BA | 2726 | 1458 | 4,184 |
| NHBA | 2607 | 1387 | 3,994 |
| H | 1635 | 1256 | 2,891 |
| HWAC | 1434 | 1132 | 2,566 |
| HWA | 1353 | 1051 | 2,404 |
| TOM | 594 | 630 | 1,224 |
| NHTOM | 511 | 546 | 1,057 |
| AAC | 304 | 346 | 650 |
| NHAAC | 278 | 327 | 605 |
| AA | 211 | 265 | 476 |
| IAC | 246 | 218 | 464 |
| NHAA | 200 | 254 | 454 |
| NHIAC | 147 | 153 | 300 |
| HBAC | 164 | 120 | 284 |
| IA | 113 | 81 | 194 |
| HBA | 119 | 71 | 190 |
| HTOM | 83 | 84 | 167 |
| HIAC | 99 | 65 | 164 |
| HIA | 68 | 35 | 103 |
| NHIA | 45 | 46 | 91 |
| NAC | 26 | 25 | 51 |
| HAAC | 26 | 19 | 45 |
| NHNAC | 23 | 19 | 42 |
| HAA | 11 | 11 | 22 |
| NA | 4 | 11 | 15 |
| NHNA | 3 | 7 | 10 |
| HNAC | 3 | 6 | 9 |
| HNA | 1 | 4 | 5 |
• Peoria County population
25.4 mi, 
113°
• Rock Island County
41.5 mi, 
333°
• Henry County
29.3 mi, 
8°
• Fulton County
32.2 mi, 
178°
• McDonough County
40.9 mi, 
216°
• Warren County
21.9 mi, 
255°
• Mercer County
33.4 mi, 
304°
• Marshall County
46 mi, 
81°
• Henderson County
38.8 mi, 258°
• Stark County
24.5 mi, 
62°
[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
*Madison Illinois Notes
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