Last official estimated population of Jefferson County was 38,804 (year 2014)[1]. This was 0.012% of total US population and 0.3% of total Illinois state population. Area of Jefferson County is 583.8 mi² (=1512 km²), in this year population density was 66.47 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Jefferson County population in 2026 would be 38,735 [0].
Historical population of Jefferson 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] +13.97 %/yr
[1830-1840] +8.47 %/yr
[1840-1850] +3.48 %/yr
[1850-1860] +4.8 %/yr
[1860-1870] +3.26 %/yr
[1870-1880] +1.48 %/yr
[1880-1890] +0.88 %/yr
[1890-1900] +2.22 %/yr
[1900-1910] +0.34 %/yr
[1910-1920] -0.22 %/yr
[1920-1930] +0.86 %/yr
[1930-1940] +1.03 %/yr
[1940-1950] +0.43 %/yr
[1950-1960] -1.04 %/yr
[1960-1970] -0.27 %/yr
[1970-1980] +1.52 %/yr
[1980-1990] +0.13 %/yr
[1990-2000] +0.79 %/yr
[2000-2005] -0.21 %/yr
[2005-2010] -0.41 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, IL
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1198 | 1224 | 2,422 |
| 5 to 9 | 1171 | 1170 | 2,341 |
| 10 to 14 | 1214 | 1089 | 2,303 |
| 15 to 19 | 1164 | 993 | 2,157 |
| 20 to 24 | 1341 | 1105 | 2,446 |
| 25 to 29 | 1307 | 1018 | 2,325 |
| 30 to 34 | 1372 | 1139 | 2,511 |
| 35 to 39 | 1293 | 1014 | 2,307 |
| 40 to 44 | 1305 | 1113 | 2,418 |
| 45 to 49 | 1390 | 1134 | 2,524 |
| 50 to 54 | 1372 | 1301 | 2,673 |
| 55 to 59 | 1365 | 1366 | 2,731 |
| 60 to 64 | 1282 | 1322 | 2,604 |
| 65 to 69 | 1084 | 1068 | 2,152 |
| 70 to 74 | 788 | 877 | 1,665 |
| 75 to 79 | 529 | 659 | 1,188 |
| 80 to 84 | 336 | 470 | 806 |
| 85+ | 306 | 655 | 961 |
Jefferson 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 | 19259 | 18396 | 37,655 |
| WAC | 17441 | 17063 | 34,504 |
| WA | 17119 | 16741 | 33,860 |
| NHWAC | 16995 | 16791 | 33,786 |
| NHWA | 16702 | 16489 | 33,191 |
| BAC | 2282 | 1570 | 3,852 |
| NHBAC | 2181 | 1529 | 3,710 |
| BA | 2069 | 1363 | 3,432 |
| NHBA | 1985 | 1334 | 3,319 |
| H | 558 | 321 | 879 |
| HWAC | 446 | 272 | 718 |
| HWA | 417 | 252 | 669 |
| TOM | 336 | 333 | 669 |
| NHTOM | 306 | 313 | 619 |
| AAC | 274 | 261 | 535 |
| NHAAC | 270 | 259 | 529 |
| AA | 221 | 215 | 436 |
| NHAA | 220 | 213 | 433 |
| IAC | 145 | 149 | 294 |
| NHIAC | 109 | 122 | 231 |
| HBAC | 101 | 41 | 142 |
| IA | 67 | 61 | 128 |
| HBA | 84 | 29 | 113 |
| NHIA | 42 | 43 | 85 |
| HIAC | 36 | 27 | 63 |
| HTOM | 30 | 20 | 50 |
| HIA | 25 | 18 | 43 |
| NAC | 14 | 10 | 24 |
| NHNAC | 13 | 10 | 23 |
| NA | 5 | 4 | 9 |
| NHNA | 4 | 4 | 8 |
| HAAC | 4 | 2 | 6 |
| HAA | 1 | 2 | 3 |
| HNAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
• Williamson County population
39.4 mi, 
180°
• Franklin County
21.3 mi, 180°
• Marion County
24 mi, 
0°
• Clinton County
34.4 mi, 
307°
• Perry County
28.4 mi, 
238°
• Wayne County
28.1 mi, 
71°
• Washington County
27 mi, 
277°
• White County
43.1 mi, 
110°
• Clay County
39 mi, 
37°
• Hamilton County
25.7 mi, 
125°
[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, St. Clair Illinois Notes
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