Last official estimated population of Jersey County was 22,964 (year 2014)[1]. This was 0.007% of total US population and 0.2% of total Illinois state population. Area of Jersey County is 377.1 mi² (=976.8 km²), in this year population density was 60.89 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Jersey County population in 2024 would be 22,912 [0].
Historical population of Jersey 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] +4.95 %/yr
[1850-1860] +5.06 %/yr
[1860-1870] +2.25 %/yr
[1870-1880] +0.32 %/yr
[1880-1890] -0.48 %/yr
[1890-1900] -0.13 %/yr
[1900-1910] -0.46 %/yr
[1910-1920] -0.95 %/yr
[1920-1930] -0.1 %/yr
[1930-1940] +0.83 %/yr
[1940-1950] +1.13 %/yr
[1950-1960] +1.1 %/yr
[1960-1970] +0.83 %/yr
[1970-1980] +1.05 %/yr
[1980-1990] +0 %/yr
[1990-2000] +0.53 %/yr
[2000-2005] +0.77 %/yr
[2005-2010] +0.43 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Jersey County? Visit this page: Settlements in Jersey County, IL
Population of Jersey County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 568 | 551 | 1,119 |
| 5 to 9 | 669 | 668 | 1,337 |
| 10 to 14 | 744 | 699 | 1,443 |
| 15 to 19 | 795 | 812 | 1,607 |
| 20 to 24 | 749 | 778 | 1,527 |
| 25 to 29 | 592 | 641 | 1,233 |
| 30 to 34 | 632 | 611 | 1,243 |
| 35 to 39 | 605 | 642 | 1,247 |
| 40 to 44 | 654 | 668 | 1,322 |
| 45 to 49 | 739 | 762 | 1,501 |
| 50 to 54 | 903 | 951 | 1,854 |
| 55 to 59 | 846 | 880 | 1,726 |
| 60 to 64 | 723 | 712 | 1,435 |
| 65 to 69 | 554 | 625 | 1,179 |
| 70 to 74 | 463 | 512 | 975 |
| 75 to 79 | 347 | 398 | 745 |
| 80 to 84 | 226 | 299 | 525 |
| 85+ | 193 | 360 | 553 |
Jersey 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 | 10883 | 11400 | 22,283 |
| WAC | 10831 | 11382 | 22,213 |
| NHWAC | 10730 | 11240 | 21,970 |
| WA | 10706 | 11258 | 21,964 |
| NHWA | 10615 | 11126 | 21,741 |
| H | 119 | 169 | 288 |
| TOM | 133 | 132 | 265 |
| BAC | 121 | 132 | 253 |
| NHTOM | 123 | 122 | 245 |
| HWAC | 101 | 142 | 243 |
| NHBAC | 109 | 126 | 235 |
| HWA | 91 | 132 | 223 |
| IAC | 102 | 84 | 186 |
| AAC | 73 | 97 | 170 |
| NHIAC | 86 | 72 | 158 |
| NHAAC | 73 | 78 | 151 |
| BA | 78 | 72 | 150 |
| NHBA | 72 | 69 | 141 |
| AA | 41 | 74 | 115 |
| NHAA | 41 | 55 | 96 |
| IA | 39 | 32 | 71 |
| NHIA | 27 | 27 | 54 |
| HIAC | 16 | 12 | 28 |
| HTOM | 10 | 10 | 20 |
| HAA | 0 | 19 | 19 |
| HAAC | 0 | 19 | 19 |
| HBAC | 12 | 6 | 18 |
| HIA | 12 | 5 | 17 |
| NAC | 9 | 6 | 15 |
| NHNAC | 9 | 6 | 15 |
| HBA | 6 | 3 | 9 |
| NA | 5 | 1 | 6 |
| NHNA | 5 | 1 | 6 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• St. Louis County population
30.7 mi, 
188°
• St. Charles County
26.7 mi, 
219°
• St. Louis city
31.3 mi, 
168°
• Madison County
30.3 mi, 
125°
• Lincoln County
32.3 mi, 
267°
• Macoupin County
26.6 mi, 
61°
• Morgan County
44.9 mi, 
10°
• Greene County
19.1 mi, 
355°
• Scott County
39 mi, 
350°
• Calhoun County
17.3 mi, 
289°
[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
*Greene Illinois Notes
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