Last official estimated population of De Witt County was 16,578 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of De Witt County is 405.1 mi² (=1049.2 km²), in this year population density was 40.92 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), De Witt County population in 2026 would be 16,629 [0].
Historical population of De Witt 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] +4.42 %/yr
[1850-1860] +8.02 %/yr
[1860-1870] +3.16 %/yr
[1870-1880] +1.42 %/yr
[1880-1890] +0 %/yr
[1890-1900] +1.1 %/yr
[1900-1910] -0.03 %/yr
[1910-1920] +0.18 %/yr
[1920-1930] -0.35 %/yr
[1930-1940] -0.19 %/yr
[1940-1950] -0.77 %/yr
[1950-1960] +0.21 %/yr
[1960-1970] -0.16 %/yr
[1970-1980] +0.65 %/yr
[1980-1990] -0.92 %/yr
[1990-2000] +0.17 %/yr
[2000-2005] -0.1 %/yr
[2005-2010] -0.19 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in De Witt County? Visit this page: Settlements in De Witt County, IL
Population of De Witt County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 471 | 417 | 888 |
| 5 to 9 | 508 | 415 | 923 |
| 10 to 14 | 535 | 543 | 1,078 |
| 15 to 19 | 495 | 455 | 950 |
| 20 to 24 | 465 | 424 | 889 |
| 25 to 29 | 425 | 404 | 829 |
| 30 to 34 | 506 | 496 | 1,002 |
| 35 to 39 | 497 | 466 | 963 |
| 40 to 44 | 539 | 505 | 1,044 |
| 45 to 49 | 567 | 546 | 1,113 |
| 50 to 54 | 633 | 623 | 1,256 |
| 55 to 59 | 692 | 653 | 1,345 |
| 60 to 64 | 509 | 549 | 1,058 |
| 65 to 69 | 436 | 474 | 910 |
| 70 to 74 | 350 | 423 | 773 |
| 75 to 79 | 234 | 318 | 552 |
| 80 to 84 | 139 | 188 | 327 |
| 85+ | 129 | 255 | 384 |
De Witt 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 | 7978 | 8036 | 16,014 |
| NH | 7928 | 7982 | 15,910 |
| WA | 7883 | 7942 | 15,825 |
| NHWAC | 7795 | 7874 | 15,669 |
| NHWA | 7705 | 7787 | 15,492 |
| H | 202 | 172 | 374 |
| HWAC | 183 | 162 | 345 |
| HWA | 178 | 155 | 333 |
| BAC | 135 | 87 | 222 |
| NHBAC | 121 | 83 | 204 |
| TOM | 101 | 102 | 203 |
| NHTOM | 96 | 93 | 189 |
| AAC | 58 | 83 | 141 |
| NHAAC | 58 | 77 | 135 |
| BA | 88 | 40 | 128 |
| NHBA | 78 | 38 | 116 |
| IAC | 58 | 42 | 100 |
| AA | 31 | 54 | 85 |
| NHIAC | 48 | 35 | 83 |
| NHAA | 31 | 52 | 83 |
| IA | 25 | 12 | 37 |
| NHIA | 16 | 9 | 25 |
| HBAC | 14 | 4 | 18 |
| HIAC | 10 | 7 | 17 |
| NAC | 7 | 8 | 15 |
| HTOM | 5 | 9 | 14 |
| NHNAC | 7 | 6 | 13 |
| HBA | 10 | 2 | 12 |
| HIA | 9 | 3 | 12 |
| NA | 2 | 4 | 6 |
| HAAC | 0 | 6 | 6 |
| NHNA | 2 | 3 | 5 |
| HNAC | 0 | 2 | 2 |
| HAA | 0 | 2 | 2 |
| HNA | 0 | 1 | 1 |
• Champaign County population
37.3 mi, 
94°
• McLean County
21.8 mi, 
7°
• Tazewell County
39.4 mi, 
304°
• Macon County
22.4 mi, 
188°
• Woodford County
45 mi, 
338°
• Logan County
24.7 mi, 
261°
• Douglas County
46 mi, 
128°
• Piatt County
20.2 mi, 126°
• Moultrie County
40.4 mi, 
158°
• Ford County
45.7 mi, 
51°
[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
*Macon, Tazewell Illinois Notes
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