Last official estimated population of Iroquois County was 29,663 (year 2014)[1]. This was 0.009% of total US population and 0.2% of total Illinois state population. Area of Iroquois County is 1,118.9 mi² (=2898 km²), in this year population density was 26.51 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Iroquois County population in 2026 would be 29,499 [0].
Historical population of Iroquois 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] +9.36 %/yr
[1850-1860] +11.5 %/yr
[1860-1870] +7.66 %/yr
[1870-1880] +3.24 %/yr
[1880-1890] -0.08 %/yr
[1890-1900] +0.78 %/yr
[1900-1910] -0.67 %/yr
[1910-1920] -0.2 %/yr
[1920-1930] -0.57 %/yr
[1930-1940] -0.13 %/yr
[1940-1950] -0.05 %/yr
[1950-1960] +0.37 %/yr
[1960-1970] -0.01 %/yr
[1970-1980] -0.17 %/yr
[1980-1990] -0.68 %/yr
[1990-2000] +0.18 %/yr
[2000-2005] -0.51 %/yr
[2005-2010] -0.55 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Iroquois County? Visit this page: Settlements in Iroquois County, IL
Population of Iroquois County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 795 | 782 | 1,577 |
| 5 to 9 | 862 | 850 | 1,712 |
| 10 to 14 | 960 | 944 | 1,904 |
| 15 to 19 | 1028 | 855 | 1,883 |
| 20 to 24 | 796 | 751 | 1,547 |
| 25 to 29 | 717 | 681 | 1,398 |
| 30 to 34 | 770 | 850 | 1,620 |
| 35 to 39 | 794 | 779 | 1,573 |
| 40 to 44 | 809 | 795 | 1,604 |
| 45 to 49 | 861 | 917 | 1,778 |
| 50 to 54 | 1079 | 1096 | 2,175 |
| 55 to 59 | 1112 | 1178 | 2,290 |
| 60 to 64 | 954 | 967 | 1,921 |
| 65 to 69 | 830 | 880 | 1,710 |
| 70 to 74 | 618 | 775 | 1,393 |
| 75 to 79 | 521 | 544 | 1,065 |
| 80 to 84 | 294 | 462 | 756 |
| 85+ | 317 | 656 | 973 |
Iroquois 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 | 13797 | 14476 | 28,273 |
| WA | 13610 | 14314 | 27,924 |
| NH | 13124 | 13869 | 26,993 |
| NHWAC | 12844 | 13607 | 26,451 |
| NHWA | 12687 | 13466 | 26,153 |
| H | 993 | 893 | 1,886 |
| HWAC | 953 | 869 | 1,822 |
| HWA | 923 | 848 | 1,771 |
| BAC | 299 | 212 | 511 |
| NHBAC | 276 | 199 | 475 |
| TOM | 194 | 168 | 362 |
| BA | 200 | 125 | 325 |
| NHBA | 190 | 123 | 313 |
| NHTOM | 164 | 147 | 311 |
| AAC | 93 | 131 | 224 |
| IAC | 112 | 104 | 216 |
| NHAAC | 83 | 126 | 209 |
| AA | 67 | 107 | 174 |
| NHAA | 58 | 102 | 160 |
| NHIAC | 77 | 76 | 153 |
| IA | 45 | 42 | 87 |
| HIAC | 35 | 28 | 63 |
| HTOM | 30 | 21 | 51 |
| NHIA | 25 | 25 | 50 |
| HIA | 20 | 17 | 37 |
| HBAC | 23 | 13 | 36 |
| NAC | 10 | 9 | 19 |
| NHNAC | 8 | 9 | 17 |
| HAAC | 10 | 5 | 15 |
| HAA | 9 | 5 | 14 |
| HBA | 10 | 2 | 12 |
| NA | 1 | 6 | 7 |
| NHNA | 0 | 6 | 6 |
| HNAC | 2 | 0 | 2 |
| HNA | 1 | 0 | 1 |
• Champaign County population
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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
*Vermilion Illinois Notes
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