Last official estimated population of Tazewell County was 135,447 (year 2014)[1]. This was 0.042% of total US population and 1.1% of total Illinois state population. Area of Tazewell County is 657.9 mi² (=1704 km²), in this year population density was 205.87 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Tazewell County population in 2026 would be 135,606 [0].
Historical population of Tazewell 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] +4.35 %/yr
[1840-1850] +5.26 %/yr
[1850-1860] +5.94 %/yr
[1860-1870] +2.66 %/yr
[1870-1880] +0.61 %/yr
[1880-1890] -0.04 %/yr
[1890-1900] +1.18 %/yr
[1900-1910] +0.24 %/yr
[1910-1920] +1.25 %/yr
[1920-1930] +1.8 %/yr
[1930-1940] +2.39 %/yr
[1940-1950] +2.7 %/yr
[1950-1960] +2.74 %/yr
[1960-1970] +1.75 %/yr
[1970-1980] +1.08 %/yr
[1980-1990] -0.65 %/yr
[1990-2000] +0.38 %/yr
[2000-2005] +0.36 %/yr
[2005-2010] +0.7 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Tazewell County? Visit this page: Settlements in Tazewell County, IL
Population of Tazewell County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4147 | 4032 | 8,179 |
| 5 to 9 | 4518 | 4390 | 8,908 |
| 10 to 14 | 4532 | 4377 | 8,909 |
| 15 to 19 | 4234 | 3846 | 8,080 |
| 20 to 24 | 3796 | 3743 | 7,539 |
| 25 to 29 | 4042 | 3851 | 7,893 |
| 30 to 34 | 4644 | 4369 | 9,013 |
| 35 to 39 | 4557 | 4360 | 8,917 |
| 40 to 44 | 4310 | 4338 | 8,648 |
| 45 to 49 | 4374 | 4232 | 8,606 |
| 50 to 54 | 4776 | 4875 | 9,651 |
| 55 to 59 | 4746 | 4951 | 9,697 |
| 60 to 64 | 4169 | 4415 | 8,584 |
| 65 to 69 | 3433 | 3744 | 7,177 |
| 70 to 74 | 2434 | 2823 | 5,257 |
| 75 to 79 | 1817 | 2330 | 4,147 |
| 80 to 84 | 1302 | 1877 | 3,179 |
| 85+ | 1156 | 2167 | 3,323 |
Tazewell 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 | 65372 | 67303 | 132,675 |
| WAC | 65038 | 67194 | 132,232 |
| WA | 64176 | 66315 | 130,491 |
| NHWAC | 63561 | 65882 | 129,443 |
| NHWA | 62775 | 65074 | 127,849 |
| H | 1615 | 1417 | 3,032 |
| HWAC | 1477 | 1312 | 2,789 |
| HWA | 1401 | 1241 | 2,642 |
| BAC | 1553 | 1038 | 2,591 |
| NHBAC | 1478 | 981 | 2,459 |
| TOM | 912 | 918 | 1,830 |
| BA | 1142 | 620 | 1,762 |
| NHBA | 1103 | 591 | 1,694 |
| NHTOM | 825 | 844 | 1,669 |
| AAC | 746 | 920 | 1,666 |
| NHAAC | 717 | 900 | 1,617 |
| AA | 485 | 670 | 1,155 |
| NHAA | 471 | 656 | 1,127 |
| IAC | 538 | 474 | 1,012 |
| NHIAC | 418 | 377 | 795 |
| IA | 252 | 173 | 425 |
| NHIA | 181 | 118 | 299 |
| HIAC | 120 | 97 | 217 |
| HTOM | 87 | 74 | 161 |
| HBAC | 75 | 57 | 132 |
| HIA | 71 | 55 | 126 |
| NAC | 48 | 50 | 98 |
| NHNAC | 41 | 43 | 84 |
| HBA | 39 | 29 | 68 |
| HAAC | 29 | 20 | 49 |
| NA | 20 | 24 | 44 |
| NHNA | 17 | 20 | 37 |
| HAA | 14 | 14 | 28 |
| HNAC | 7 | 7 | 14 |
| HNA | 3 | 4 | 7 |
• Peoria County population
23.3 mi,
325°
• McLean County
35.3 mi,
91°
• Woodford County
25.2 mi,
39°
• Fulton County
36.2 mi,
265°
• Logan County
27.4 mi,
163°
• De Witt County
39.4 mi,
124°
• Mason County
28.1 mi,
228°
• Menard County
36.6 mi,
203°
• Marshall County
37.3 mi,
14°
• Stark County
43.3 mi,
340°
[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
*Clark, Bond, Madison Illinois Notes
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