Last official estimated population of Sullivan County was 21,419 (year 2014)[1]. This was 0.007% of total US population and 0.3% of total Indiana state population. Area of Sullivan County is 454.1 mi² (=1176.2 km²), in this year population density was 47.17 p/mi². If population growth rate would be same as in period 2010-2014 (-0.07%/yr), Sullivan County population in 2023 would be 21,294 [0].
Historical population of Sullivan 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] +2.84 %/yr
[1830-1840] +6.03 %/yr
[1840-1850] +2.01 %/yr
[1850-1860] +4.04 %/yr
[1860-1870] +2.05 %/yr
[1870-1880] +0.98 %/yr
[1880-1890] +0.73 %/yr
[1890-1900] +1.74 %/yr
[1900-1910] +2.24 %/yr
[1910-1920] -0.25 %/yr
[1920-1930] -1.16 %/yr
[1930-1940] -0.41 %/yr
[1940-1950] -1.31 %/yr
[1950-1960] -0.85 %/yr
[1960-1970] -0.88 %/yr
[1970-1980] +0.6 %/yr
[1980-1990] -1.05 %/yr
[1990-2000] +1.36 %/yr
[2000-2005] -0.04 %/yr
[2005-2010] -0.2 %/yr
[2010-2014] -0.07 %/yr
Looking for settlements in Sullivan County? Visit this page: Settlements in Sullivan County, IN
Population of Sullivan County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 589 | 490 | 1,079 |
| 5 to 9 | 587 | 539 | 1,126 |
| 10 to 14 | 646 | 609 | 1,255 |
| 15 to 19 | 737 | 524 | 1,261 |
| 20 to 24 | 820 | 554 | 1,374 |
| 25 to 29 | 892 | 546 | 1,438 |
| 30 to 34 | 888 | 539 | 1,427 |
| 35 to 39 | 798 | 601 | 1,399 |
| 40 to 44 | 870 | 609 | 1,479 |
| 45 to 49 | 841 | 616 | 1,457 |
| 50 to 54 | 815 | 724 | 1,539 |
| 55 to 59 | 760 | 715 | 1,475 |
| 60 to 64 | 662 | 646 | 1,308 |
| 65 to 69 | 575 | 586 | 1,161 |
| 70 to 74 | 399 | 440 | 839 |
| 75 to 79 | 263 | 332 | 595 |
| 80 to 84 | 159 | 245 | 404 |
| 85+ | 135 | 299 | 434 |
Sullivan 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 | 11182 | 9497 | 20,679 |
| WAC | 10420 | 9509 | 19,929 |
| WA | 10299 | 9388 | 19,687 |
| NHWAC | 10186 | 9404 | 19,590 |
| NHWA | 10072 | 9289 | 19,361 |
| BAC | 1009 | 91 | 1,100 |
| NHBAC | 991 | 83 | 1,074 |
| BA | 952 | 40 | 992 |
| NHBA | 937 | 36 | 973 |
| H | 254 | 117 | 371 |
| HWAC | 234 | 105 | 339 |
| HWA | 227 | 99 | 326 |
| TOM | 124 | 126 | 250 |
| NHTOM | 117 | 120 | 237 |
| IAC | 83 | 97 | 180 |
| NHIAC | 76 | 88 | 164 |
| AAC | 49 | 47 | 96 |
| NHAAC | 47 | 46 | 93 |
| IA | 33 | 34 | 67 |
| NHIA | 30 | 26 | 56 |
| AA | 27 | 26 | 53 |
| NHAA | 25 | 26 | 51 |
| HBAC | 18 | 8 | 26 |
| HBA | 15 | 4 | 19 |
| HIAC | 7 | 9 | 16 |
| HTOM | 7 | 6 | 13 |
| HIA | 3 | 8 | 11 |
| NAC | 6 | 1 | 7 |
| NHNAC | 5 | 1 | 6 |
| HAAC | 2 | 1 | 3 |
| HAA | 2 | 0 | 2 |
| HNAC | 1 | 0 | 1 |
| NHNA | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| HNA | 0 | 0 | 0 |
• Vigo County population
23.5 mi, 
3°
• Knox County
27.7 mi, 
180°
• Greene County
22.2 mi, 
97°
• Daviess County
32.9 mi, 
145°
• Clay County
26.5 mi, 
37°
• Owen County
34.7 mi, 
62°
• Crawford County
19.4 mi, 
252°
• Lawrence County
30.7 mi, 
213°
• Clark County
26.2 mi, 
309°
• Jasper County
39.9 mi, 
261°
[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
*Knox Indiana Notes
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