Last official estimated population of Jennings County was 28,465 (year 2014)[1]. This was 0.009% of total US population and 0.4% of total Indiana state population. Area of Jennings County is 378.3 mi² (=979.9 km²), in this year population density was 75.24 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Jennings County population in 2026 would be 28,286 [0].
Historical population of Jennings 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] +7.11 %/yr
[1830-1840] +8.31 %/yr
[1840-1850] +3.2 %/yr
[1850-1860] +2 %/yr
[1860-1870] +0.95 %/yr
[1870-1880] +0.14 %/yr
[1880-1890] -1.18 %/yr
[1890-1900] +0.76 %/yr
[1900-1910] -1.03 %/yr
[1910-1920] -0.67 %/yr
[1920-1930] -1.17 %/yr
[1930-1940] +1.49 %/yr
[1940-1950] +1.09 %/yr
[1950-1960] +1.25 %/yr
[1960-1970] +1.2 %/yr
[1970-1980] +1.62 %/yr
[1980-1990] +0.35 %/yr
[1990-2000] +1.54 %/yr
[2000-2005] +0.57 %/yr
[2005-2010] +0.12 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Jennings County? Visit this page: Settlements in Jennings County, IN
Population of Jennings County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 917 | 815 | 1,732 |
| 5 to 9 | 927 | 906 | 1,833 |
| 10 to 14 | 967 | 934 | 1,901 |
| 15 to 19 | 1010 | 978 | 1,988 |
| 20 to 24 | 965 | 897 | 1,862 |
| 25 to 29 | 803 | 745 | 1,548 |
| 30 to 34 | 753 | 741 | 1,494 |
| 35 to 39 | 842 | 804 | 1,646 |
| 40 to 44 | 986 | 993 | 1,979 |
| 45 to 49 | 1055 | 985 | 2,040 |
| 50 to 54 | 1099 | 1088 | 2,187 |
| 55 to 59 | 1045 | 960 | 2,005 |
| 60 to 64 | 805 | 845 | 1,650 |
| 65 to 69 | 707 | 779 | 1,486 |
| 70 to 74 | 558 | 580 | 1,138 |
| 75 to 79 | 324 | 413 | 737 |
| 80 to 84 | 166 | 248 | 414 |
| 85+ | 118 | 242 | 360 |
Jennings 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 | 13836 | 13759 | 27,595 |
| NH | 13737 | 13618 | 27,355 |
| WA | 13661 | 13629 | 27,290 |
| NHWAC | 13540 | 13439 | 26,979 |
| NHWA | 13375 | 13318 | 26,693 |
| H | 310 | 335 | 645 |
| HWAC | 296 | 320 | 616 |
| HWA | 286 | 311 | 597 |
| BAC | 229 | 172 | 401 |
| NHBAC | 220 | 160 | 380 |
| TOM | 183 | 134 | 317 |
| NHTOM | 173 | 125 | 298 |
| BA | 151 | 107 | 258 |
| NHBA | 144 | 97 | 241 |
| IAC | 109 | 94 | 203 |
| NHIAC | 98 | 84 | 182 |
| AAC | 55 | 59 | 114 |
| NHAAC | 54 | 59 | 113 |
| AA | 25 | 52 | 77 |
| NHAA | 25 | 52 | 77 |
| IA | 22 | 26 | 48 |
| NHIA | 18 | 23 | 41 |
| HIAC | 11 | 10 | 21 |
| HBAC | 9 | 12 | 21 |
| HTOM | 10 | 9 | 19 |
| HBA | 7 | 10 | 17 |
| NAC | 7 | 8 | 15 |
| NA | 5 | 5 | 10 |
| NHNAC | 4 | 6 | 10 |
| HIA | 4 | 3 | 7 |
| HNAC | 3 | 2 | 5 |
| HNA | 3 | 2 | 5 |
| NHNA | 2 | 3 | 5 |
| HAAC | 1 | 0 | 1 |
| HAA | 0 | 0 | 0 |
• Bartholomew County population
20.5 mi, 
315°
• Jackson County
23 mi, 
255°
• Jefferson County
17.8 mi, 
145°
• Ripley County
21 mi, 
69°
• Decatur County
22.5 mi, 
17°
• Scott County
22.9 mi, 
196°
• Brown County
35.5 mi, 
292°
• Carroll County
35.3 mi, 
129°
• Switzerland County
34.3 mi, 
110°
• Trimble County
30 mi, 150°
[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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