Last official estimated population of DeKalb County was 105,119 (year 2014)[1]. This was 0.033% of total US population and 0.8% of total Illinois state population. Area of DeKalb County is 634.7 mi² (=1643.8 km²), in this year population density was 165.63 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), DeKalb County population in 2025 would be 105,006 [0].
Historical population of DeKalb 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] +16.08 %/yr
[1850-1860] +9.73 %/yr
[1860-1870] +2 %/yr
[1870-1880] +1.41 %/yr
[1880-1890] +0.11 %/yr
[1890-1900] +1.61 %/yr
[1900-1910] +0.52 %/yr
[1910-1920] -0.65 %/yr
[1920-1930] +0.41 %/yr
[1930-1940] +0.52 %/yr
[1940-1950] +1.72 %/yr
[1950-1960] +2.4 %/yr
[1960-1970] +3.31 %/yr
[1970-1980] +0.41 %/yr
[1980-1990] +0.43 %/yr
[1990-2000] +1.33 %/yr
[2000-2005] +2.05 %/yr
[2005-2010] +1.33 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in DeKalb County? Visit this page: Settlements in DeKalb County, IL
Population of DeKalb County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3076 | 2992 | 6,068 |
| 5 to 9 | 3222 | 3181 | 6,403 |
| 10 to 14 | 3378 | 3199 | 6,577 |
| 15 to 19 | 4846 | 4852 | 9,698 |
| 20 to 24 | 8035 | 8225 | 16,260 |
| 25 to 29 | 3830 | 3629 | 7,459 |
| 30 to 34 | 3386 | 3323 | 6,709 |
| 35 to 39 | 2927 | 2813 | 5,740 |
| 40 to 44 | 2919 | 2880 | 5,799 |
| 45 to 49 | 2850 | 2938 | 5,788 |
| 50 to 54 | 3106 | 3234 | 6,340 |
| 55 to 59 | 2962 | 2957 | 5,919 |
| 60 to 64 | 2437 | 2518 | 4,955 |
| 65 to 69 | 1834 | 1960 | 3,794 |
| 70 to 74 | 1329 | 1471 | 2,800 |
| 75 to 79 | 859 | 1140 | 1,999 |
| 80 to 84 | 640 | 852 | 1,492 |
| 85+ | 538 | 1124 | 1,662 |
DeKalb 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 | 46404 | 47592 | 93,996 |
| WAC | 46878 | 47012 | 93,890 |
| WA | 46048 | 46090 | 92,138 |
| NHWAC | 41512 | 41772 | 83,284 |
| NHWA | 40828 | 41033 | 81,861 |
| H | 5770 | 5696 | 11,466 |
| HWAC | 5366 | 5240 | 10,606 |
| HWA | 5220 | 5057 | 10,277 |
| BAC | 4015 | 4896 | 8,911 |
| NHBAC | 3788 | 4641 | 8,429 |
| BA | 3582 | 4381 | 7,963 |
| NHBA | 3432 | 4220 | 7,652 |
| AAC | 1668 | 1878 | 3,546 |
| NHAAC | 1591 | 1717 | 3,308 |
| AA | 1388 | 1572 | 2,960 |
| NHAA | 1328 | 1442 | 2,770 |
| TOM | 889 | 999 | 1,888 |
| NHTOM | 728 | 803 | 1,531 |
| IAC | 472 | 482 | 954 |
| NHIAC | 232 | 253 | 485 |
| HBAC | 227 | 255 | 482 |
| HIAC | 240 | 229 | 469 |
| IA | 229 | 207 | 436 |
| HTOM | 161 | 196 | 357 |
| HBA | 150 | 161 | 311 |
| HIA | 161 | 140 | 301 |
| HAAC | 77 | 161 | 238 |
| HAA | 60 | 130 | 190 |
| NAC | 72 | 75 | 147 |
| NHIA | 68 | 67 | 135 |
| NHNAC | 47 | 54 | 101 |
| NA | 38 | 39 | 77 |
| NHNA | 20 | 27 | 47 |
| HNAC | 25 | 21 | 46 |
| HNA | 18 | 12 | 30 |
• DuPage County population
35.3 mi, 
94°
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17.8 mi, 
79°
• McHenry County
33.8 mi, 
28°
• Winnebago County
36.6 mi, 
326°
• Kendall County
27.4 mi, 
140°
• LaSalle County
38.6 mi, 
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• Boone County
29.5 mi, 
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• Ogle County
30.1 mi, 
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• Grundy County
45.7 mi, 
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• Lee County
29.1 mi, 
249°
[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 Illinois Notes
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