Last official estimated population of Jefferson County was 32,425 (year 2014)[1]. This was 0.01% of total US population and 0.5% of total Indiana state population. Area of Jefferson County is 362.9 mi² (=939.9 km²), in this year population density was 89.35 p/mi². If population growth rate would be same as in period 2010-2014 (-0%/yr), Jefferson County population in 2021 would be 32,420 [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] +3.61 %/yr
[1830-1840] +3.78 %/yr
[1840-1850] +3.71 %/yr
[1850-1860] +0.46 %/yr
[1860-1870] +1.74 %/yr
[1870-1880] -1.34 %/yr
[1880-1890] -0.58 %/yr
[1890-1900] -0.67 %/yr
[1900-1910] -1.11 %/yr
[1910-1920] +0.11 %/yr
[1920-1930] -0.76 %/yr
[1930-1940] +0.37 %/yr
[1940-1950] +0.82 %/yr
[1950-1960] +1.08 %/yr
[1960-1970] +1.16 %/yr
[1970-1980] +1.2 %/yr
[1980-1990] -0.21 %/yr
[1990-2000] +0.62 %/yr
[2000-2005] +0.18 %/yr
[2005-2010] +0.27 %/yr
[2010-2014] -0 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, IN
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 878 | 883 | 1,761 |
| 5 to 9 | 955 | 911 | 1,866 |
| 10 to 14 | 1022 | 924 | 1,946 |
| 15 to 19 | 1079 | 1267 | 2,346 |
| 20 to 24 | 1122 | 1210 | 2,332 |
| 25 to 29 | 871 | 943 | 1,814 |
| 30 to 34 | 878 | 1034 | 1,912 |
| 35 to 39 | 935 | 1019 | 1,954 |
| 40 to 44 | 1020 | 1062 | 2,082 |
| 45 to 49 | 1028 | 1135 | 2,163 |
| 50 to 54 | 1269 | 1247 | 2,516 |
| 55 to 59 | 1180 | 1243 | 2,423 |
| 60 to 64 | 1047 | 1050 | 2,097 |
| 65 to 69 | 866 | 921 | 1,787 |
| 70 to 74 | 655 | 714 | 1,369 |
| 75 to 79 | 384 | 456 | 840 |
| 80 to 84 | 280 | 397 | 677 |
| 85+ | 191 | 418 | 609 |
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 | 15246 | 16444 | 31,690 |
| WAC | 15216 | 16264 | 31,480 |
| WA | 15007 | 16043 | 31,050 |
| NHWAC | 14843 | 15900 | 30,743 |
| NHWA | 14642 | 15697 | 30,339 |
| BAC | 413 | 482 | 895 |
| NHBAC | 384 | 459 | 843 |
| H | 414 | 390 | 804 |
| HWAC | 373 | 364 | 737 |
| HWA | 365 | 346 | 711 |
| BA | 295 | 358 | 653 |
| NHBA | 268 | 341 | 609 |
| TOM | 222 | 228 | 450 |
| NHTOM | 213 | 209 | 422 |
| AAC | 125 | 195 | 320 |
| NHAAC | 124 | 189 | 313 |
| AA | 87 | 157 | 244 |
| NHAA | 87 | 157 | 244 |
| IAC | 122 | 118 | 240 |
| NHIAC | 106 | 102 | 208 |
| IA | 43 | 45 | 88 |
| NHIA | 34 | 37 | 71 |
| HBAC | 29 | 23 | 52 |
| HBA | 27 | 17 | 44 |
| HIAC | 16 | 16 | 32 |
| HTOM | 9 | 19 | 28 |
| NAC | 9 | 11 | 20 |
| HIA | 9 | 8 | 17 |
| NHNAC | 5 | 11 | 16 |
| NA | 6 | 3 | 9 |
| HAAC | 1 | 6 | 7 |
| NHNA | 2 | 3 | 5 |
| HNAC | 4 | 0 | 4 |
| HNA | 4 | 0 | 4 |
| HAA | 0 | 0 | 0 |
• Clark County population
25.8 mi, 
214°
• Oldham County
26.5 mi, 
181°
• Ripley County
23.9 mi, 
23°
• Jennings County
17.8 mi, 
325°
• Scott County
18.3 mi, 
246°
• Henry County
28.7 mi, 
143°
• Carroll County
18.8 mi, 
115°
• Switzerland County
22.3 mi, 
82°
• Trimble County
12.3 mi, 
157°
• Ohio County
27.8 mi, 
67°
[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
*Clark Indiana Notes
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