Last official estimated population of Whiteside County was 58,472 (year 2014)[1]. This was 0.018% of total US population and 0.5% of total Illinois state population. Area of Whiteside County is 696.5 mi² (=1804 km²), in this year population density was 83.95 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Whiteside County population in 2025 would be 58,401 [0].
Historical population of Whiteside 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] +7.87 %/yr
[1850-1860] +13.33 %/yr
[1860-1870] +3.91 %/yr
[1870-1880] +1.17 %/yr
[1880-1890] -0.01 %/yr
[1890-1900] +1.18 %/yr
[1900-1910] -0.06 %/yr
[1910-1920] +0.47 %/yr
[1920-1930] +0.76 %/yr
[1930-1940] +1.06 %/yr
[1940-1950] +1.3 %/yr
[1950-1960] +1.96 %/yr
[1960-1970] +0.49 %/yr
[1970-1980] +0.48 %/yr
[1980-1990] -0.91 %/yr
[1990-2000] +0.08 %/yr
[2000-2005] -0.52 %/yr
[2005-2010] -0.2 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Whiteside County? Visit this page: Settlements in Whiteside County, IL
Population of Whiteside County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1603 | 1484 | 3,087 |
| 5 to 9 | 1836 | 1744 | 3,580 |
| 10 to 14 | 1875 | 1832 | 3,707 |
| 15 to 19 | 1860 | 1811 | 3,671 |
| 20 to 24 | 1734 | 1594 | 3,328 |
| 25 to 29 | 1513 | 1507 | 3,020 |
| 30 to 34 | 1525 | 1522 | 3,047 |
| 35 to 39 | 1539 | 1516 | 3,055 |
| 40 to 44 | 1756 | 1719 | 3,475 |
| 45 to 49 | 1833 | 1819 | 3,652 |
| 50 to 54 | 2066 | 2111 | 4,177 |
| 55 to 59 | 2201 | 2153 | 4,354 |
| 60 to 64 | 1955 | 2003 | 3,958 |
| 65 to 69 | 1526 | 1676 | 3,202 |
| 70 to 74 | 1204 | 1292 | 2,496 |
| 75 to 79 | 863 | 1079 | 1,942 |
| 80 to 84 | 609 | 839 | 1,448 |
| 85+ | 550 | 1127 | 1,677 |
Whiteside 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 | 27215 | 28065 | 55,280 |
| WA | 26774 | 27623 | 54,397 |
| NH | 24607 | 25572 | 50,179 |
| NHWAC | 23974 | 24987 | 48,961 |
| NHWA | 23644 | 24655 | 48,299 |
| H | 3441 | 3256 | 6,697 |
| HWAC | 3241 | 3078 | 6,319 |
| HWA | 3130 | 2968 | 6,098 |
| BAC | 814 | 719 | 1,533 |
| NHBAC | 670 | 568 | 1,238 |
| BA | 530 | 444 | 974 |
| TOM | 466 | 470 | 936 |
| NHBA | 445 | 351 | 796 |
| NHTOM | 352 | 355 | 707 |
| IAC | 271 | 249 | 520 |
| AAC | 196 | 252 | 448 |
| NHAAC | 174 | 231 | 405 |
| AA | 120 | 178 | 298 |
| HBAC | 144 | 151 | 295 |
| NHAA | 112 | 169 | 281 |
| NHIAC | 129 | 137 | 266 |
| HIAC | 142 | 112 | 254 |
| IA | 147 | 106 | 253 |
| HTOM | 114 | 115 | 229 |
| HBA | 85 | 93 | 178 |
| HIA | 97 | 65 | 162 |
| NHIA | 50 | 41 | 91 |
| NAC | 25 | 22 | 47 |
| HAAC | 22 | 21 | 43 |
| NHNAC | 18 | 13 | 31 |
| NA | 11 | 7 | 18 |
| HAA | 8 | 9 | 17 |
| HNAC | 7 | 9 | 16 |
| HNA | 7 | 6 | 13 |
| NHNA | 4 | 1 | 5 |
• Scott County population
37.5 mi, 
258°
• Rock Island County
39.3 mi, 
240°
• Ogle County
36.4 mi, 
56°
• Henry County
29.9 mi, 
202°
• Clinton County
33.7 mi, 
287°
• Stephenson County
43.3 mi, 
16°
• Lee County
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• Bureau County
31.2 mi, 
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• Jackson County
44.5 mi, 
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• Carroll County
22.1 mi, 
358°
[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
*Jo Daviess; see note 8 Illinois Notes
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