Last official estimated population of Johnson County was 12,610 (year 2014)[1]. This was 0.004% of total US population and 0.1% of total Illinois state population. Area of Johnson County is 348.9 mi² (=903.6 km²), in this year population density was 36.15 p/mi². If population growth rate would be same as in period 2010-2014 (+0.06%/yr), Johnson County population in 2026 would be 12,694 [0].
Historical population of Johnson County for period 1820-2014 [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
[1820-1830] +6.59 %/yr
[1830-1840] +8.55 %/yr
[1840-1850] +1.27 %/yr
[1850-1860] +8.55 %/yr
[1860-1870] +1.87 %/yr
[1870-1880] +1.52 %/yr
[1880-1890] +1.39 %/yr
[1890-1900] +0.43 %/yr
[1900-1910] -0.89 %/yr
[1910-1920] -1.74 %/yr
[1920-1930] -1.63 %/yr
[1930-1940] +0.5 %/yr
[1940-1950] -2.04 %/yr
[1950-1960] -2.28 %/yr
[1960-1970] +0.86 %/yr
[1970-1980] +2.46 %/yr
[1980-1990] +1.66 %/yr
[1990-2000] +1.27 %/yr
[2000-2005] -0.09 %/yr
[2005-2010] -0.37 %/yr
[2010-2014] +0.06 %/yr
Looking for settlements in Johnson County? Visit this page: Settlements in Johnson County, IL
Population of Johnson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 300 | 302 | 602 |
| 5 to 9 | 306 | 316 | 622 |
| 10 to 14 | 380 | 328 | 708 |
| 15 to 19 | 386 | 293 | 679 |
| 20 to 24 | 576 | 295 | 871 |
| 25 to 29 | 526 | 268 | 794 |
| 30 to 34 | 503 | 287 | 790 |
| 35 to 39 | 473 | 280 | 753 |
| 40 to 44 | 492 | 317 | 809 |
| 45 to 49 | 498 | 397 | 895 |
| 50 to 54 | 517 | 400 | 917 |
| 55 to 59 | 465 | 456 | 921 |
| 60 to 64 | 415 | 399 | 814 |
| 65 to 69 | 415 | 414 | 829 |
| 70 to 74 | 340 | 312 | 652 |
| 75 to 79 | 225 | 221 | 446 |
| 80 to 84 | 119 | 158 | 277 |
| 85+ | 86 | 136 | 222 |
Johnson 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 | 6714 | 5477 | 12,191 |
| WAC | 5937 | 5512 | 11,449 |
| WA | 5888 | 5440 | 11,328 |
| NHWAC | 5684 | 5415 | 11,099 |
| NHWA | 5640 | 5344 | 10,984 |
| BAC | 1057 | 61 | 1,118 |
| NHBAC | 1027 | 60 | 1,087 |
| BA | 1037 | 29 | 1,066 |
| NHBA | 1009 | 28 | 1,037 |
| H | 308 | 102 | 410 |
| HWAC | 253 | 97 | 350 |
| HWA | 248 | 96 | 344 |
| TOM | 53 | 74 | 127 |
| NHTOM | 48 | 73 | 121 |
| IAC | 52 | 46 | 98 |
| NHIAC | 30 | 42 | 72 |
| AAC | 26 | 32 | 58 |
| NHAAC | 21 | 31 | 52 |
| IA | 29 | 10 | 39 |
| AA | 12 | 25 | 37 |
| HBAC | 30 | 1 | 31 |
| NHAA | 7 | 24 | 31 |
| HBA | 28 | 1 | 29 |
| HIAC | 22 | 4 | 26 |
| HIA | 19 | 3 | 22 |
| NHIA | 10 | 7 | 17 |
| HAAC | 5 | 1 | 6 |
| HAA | 5 | 1 | 6 |
| HTOM | 5 | 1 | 6 |
| NAC | 3 | 3 | 6 |
| NA | 3 | 1 | 4 |
| HNAC | 3 | 0 | 3 |
| HNA | 3 | 0 | 3 |
| NHNAC | 0 | 3 | 3 |
| NHNA | 0 | 1 | 1 |
• Williamson County population
18.8 mi, 
351°
• McCracken County
29.6 mi, 
161°
• Saline County
27.3 mi, 
42°
• Union County
20 mi, 
274°
• Massac County
19.5 mi, 
150°
• Livingston County
33.4 mi, 
121°
• Ballard County
29.2 mi, 
193°
• Alexander County
32 mi, 
233°
• Pulaski County
21.7 mi, 
218°
• Pope County
18.9 mi, 
99°
[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
*Randolph Illinois Notes
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