Last official estimated population of Johnson County was 140,274 (year 2014)[1]. This was 0.044% of total US population and 2.1% of total Indiana state population. Area of Johnson County is 321.8 mi² (=833.4 km²), in this year population density was 435.92 p/mi². If population growth rate would be same as in period 2010-2014 (+0.11%/yr), Johnson County population in 2025 would be 141,993 [0].
Historical population of Johnson County for period 1830-2014 [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
[1830-1840] +8.81 %/yr
[1840-1850] +2.61 %/yr
[1850-1860] +2.07 %/yr
[1860-1870] +2.15 %/yr
[1870-1880] +0.62 %/yr
[1880-1890] +0.01 %/yr
[1890-1900] +0.33 %/yr
[1900-1910] +0.08 %/yr
[1910-1920] +0.17 %/yr
[1920-1930] +0.46 %/yr
[1930-1940] +0.36 %/yr
[1940-1950] +1.53 %/yr
[1950-1960] +5.26 %/yr
[1960-1970] +3.41 %/yr
[1970-1980] +2.37 %/yr
[1980-1990] +1.33 %/yr
[1990-2000] +2.72 %/yr
[2000-2005] +1.94 %/yr
[2005-2010] +1.95 %/yr
[2010-2014] +0.11 %/yr
Looking for settlements in Johnson County? Visit this page: Settlements in Johnson County, IN
Population of Johnson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4976 | 4573 | 9,549 |
| 5 to 9 | 5282 | 5052 | 10,334 |
| 10 to 14 | 5728 | 5282 | 11,010 |
| 15 to 19 | 5242 | 4982 | 10,224 |
| 20 to 24 | 4611 | 4573 | 9,184 |
| 25 to 29 | 4460 | 4633 | 9,093 |
| 30 to 34 | 4900 | 4998 | 9,898 |
| 35 to 39 | 4866 | 4901 | 9,767 |
| 40 to 44 | 5160 | 5095 | 10,255 |
| 45 to 49 | 4975 | 4954 | 9,929 |
| 50 to 54 | 5220 | 5301 | 10,521 |
| 55 to 59 | 4554 | 4816 | 9,370 |
| 60 to 64 | 3804 | 4174 | 7,978 |
| 65 to 69 | 3220 | 3636 | 6,856 |
| 70 to 74 | 2323 | 2718 | 5,041 |
| 75 to 79 | 1546 | 1993 | 3,539 |
| 80 to 84 | 979 | 1438 | 2,417 |
| 85+ | 859 | 1714 | 2,573 |
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 | 70023 | 72436 | 142,459 |
| WAC | 69012 | 71480 | 140,492 |
| WA | 67964 | 70348 | 138,312 |
| NHWAC | 66604 | 69333 | 135,937 |
| NHWA | 65666 | 68297 | 133,963 |
| H | 2682 | 2397 | 5,079 |
| HWAC | 2408 | 2147 | 4,555 |
| HWA | 2298 | 2051 | 4,349 |
| AAC | 2113 | 2189 | 4,302 |
| NHAAC | 2044 | 2142 | 4,186 |
| BAC | 2074 | 1750 | 3,824 |
| AA | 1781 | 1855 | 3,636 |
| NHAA | 1741 | 1824 | 3,565 |
| NHBAC | 1898 | 1570 | 3,468 |
| BA | 1588 | 1209 | 2,797 |
| NHBA | 1454 | 1070 | 2,524 |
| TOM | 1101 | 1180 | 2,281 |
| NHTOM | 981 | 1077 | 2,058 |
| IAC | 551 | 560 | 1,111 |
| NHIAC | 420 | 446 | 866 |
| IA | 216 | 204 | 420 |
| HBAC | 176 | 180 | 356 |
| NHIA | 142 | 142 | 284 |
| HBA | 134 | 139 | 273 |
| HIAC | 131 | 114 | 245 |
| HTOM | 120 | 103 | 223 |
| NAC | 92 | 76 | 168 |
| HIA | 74 | 62 | 136 |
| NHNAC | 69 | 59 | 128 |
| HAAC | 69 | 47 | 116 |
| NA | 55 | 37 | 92 |
| HAA | 40 | 31 | 71 |
| NHNA | 39 | 26 | 65 |
| HNAC | 23 | 17 | 40 |
| HNA | 16 | 11 | 27 |
• Marion County population
19.9 mi, 
353°
• Hendricks County
29.1 mi, 
310°
• Monroe County
32.6 mi, 
224°
• Bartholomew County
22.6 mi, 
152°
• Hancock County
28.3 mi, 
37°
• Morgan County
18.8 mi, 
267°
• Shelby County
16.2 mi, 
83°
• Decatur County
34.4 mi, 
112°
• Rush County
34.6 mi, 75°
• Brown County
22.3 mi, 
200°
[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
*Delaware Indiana Notes
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