Last official estimated population of Will County was 678,828 (year 2014)[1]. This was 0.213% of total US population and 5.3% of total Illinois state population. Area of Will County is 849.2 mi² (=2199.5 km²), in this year population density was 799.35 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Will County population in 2025 would be 682,327 [0].
Historical population of Will 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] +5.09 %/yr
[1850-1860] +5.79 %/yr
[1860-1870] +3.91 %/yr
[1870-1880] +2.19 %/yr
[1880-1890] +1.5 %/yr
[1890-1900] +1.89 %/yr
[1900-1910] +1.22 %/yr
[1910-1920] +0.97 %/yr
[1920-1930] +1.77 %/yr
[1930-1940] +0.31 %/yr
[1940-1950] +1.64 %/yr
[1950-1960] +3.62 %/yr
[1960-1970] +2.67 %/yr
[1970-1980] +2.66 %/yr
[1980-1990] +0.97 %/yr
[1990-2000] +3.46 %/yr
[2000-2005] +4.56 %/yr
[2005-2010] +1.54 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Will County? Visit this page: Settlements in Will County, IL
Population of Will County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 21164 | 20534 | 41,698 |
| 5 to 9 | 25888 | 24886 | 50,774 |
| 10 to 14 | 28961 | 27495 | 56,456 |
| 15 to 19 | 27323 | 25361 | 52,684 |
| 20 to 24 | 22658 | 21384 | 44,042 |
| 25 to 29 | 18664 | 17803 | 36,467 |
| 30 to 34 | 20654 | 21496 | 42,150 |
| 35 to 39 | 22694 | 23781 | 46,475 |
| 40 to 44 | 26257 | 26958 | 53,215 |
| 45 to 49 | 26630 | 26925 | 53,555 |
| 50 to 54 | 26084 | 26115 | 52,199 |
| 55 to 59 | 22165 | 22359 | 44,524 |
| 60 to 64 | 16886 | 17864 | 34,750 |
| 65 to 69 | 13080 | 14322 | 27,402 |
| 70 to 74 | 8808 | 10191 | 18,999 |
| 75 to 79 | 5661 | 7164 | 12,825 |
| 80 to 84 | 3463 | 4979 | 8,442 |
| 85+ | 2904 | 5858 | 8,762 |
Will 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 | 281748 | 290201 | 571,949 |
| WAC | 280899 | 282936 | 563,835 |
| WA | 275366 | 277268 | 552,634 |
| NHWAC | 225889 | 230838 | 456,727 |
| NHWA | 221429 | 226214 | 447,643 |
| H | 58196 | 55274 | 113,470 |
| HWAC | 55010 | 52098 | 107,108 |
| HWA | 53937 | 51054 | 104,991 |
| BAC | 42273 | 44323 | 86,596 |
| NHBAC | 40302 | 42206 | 82,508 |
| BA | 39380 | 41246 | 80,626 |
| NHBA | 37930 | 39664 | 77,594 |
| AAC | 19769 | 21500 | 41,269 |
| NHAAC | 19118 | 20886 | 40,004 |
| AA | 17574 | 19282 | 36,856 |
| NHAA | 17140 | 18871 | 36,011 |
| TOM | 5939 | 6096 | 12,035 |
| NHTOM | 4797 | 4986 | 9,783 |
| IAC | 2956 | 2884 | 5,840 |
| HBAC | 1971 | 2117 | 4,088 |
| HIAC | 1615 | 1469 | 3,084 |
| HBA | 1450 | 1582 | 3,032 |
| IA | 1503 | 1394 | 2,897 |
| NHIAC | 1341 | 1415 | 2,756 |
| HTOM | 1142 | 1110 | 2,252 |
| HIA | 1117 | 1005 | 2,122 |
| HAAC | 651 | 614 | 1,265 |
| HAA | 434 | 411 | 845 |
| NHIA | 386 | 389 | 775 |
| NAC | 353 | 370 | 723 |
| NHNAC | 189 | 214 | 403 |
| NA | 182 | 189 | 371 |
| HNAC | 164 | 156 | 320 |
| HNA | 116 | 112 | 228 |
| NHNA | 66 | 77 | 143 |
• Cook County population
35.3 mi, 
29°
• DuPage County
28.4 mi, 
348°
• Kane County
41.1 mi, 
325°
• Lake County
31.3 mi, 
86°
• Porter County
47.1 mi, 
84°
• Kendall County
25.3 mi, 
292°
• LaSalle County
47.6 mi, 
261°
• Kankakee County
22.2 mi, 
164°
• Grundy County
24.4 mi, 
243°
• Newton County
45 mi, 
138°
[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
*Putnam, Vermilion Illinois Notes
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