Last official estimated population of Spencer County was 20,890 (year 2014)[1]. This was 0.007% of total US population and 0.3% of total Indiana state population. Area of Spencer County is 401.4 mi² (=1039.7 km²), in this year population density was 52.04 p/mi². If population growth rate would be same as in period 2010-2014 (-0.07%/yr), Spencer County population in 2026 would be 20,705 [0].
Historical population of Spencer 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] +5.44 %/yr
[1830-1840] +7.03 %/yr
[1840-1850] +3.17 %/yr
[1850-1860] +5.38 %/yr
[1860-1870] +2.15 %/yr
[1870-1880] +2.08 %/yr
[1880-1890] -0.03 %/yr
[1890-1900] +0.16 %/yr
[1900-1910] -0.8 %/yr
[1910-1920] -1.16 %/yr
[1920-1930] -0.96 %/yr
[1930-1940] -0.3 %/yr
[1940-1950] -0.02 %/yr
[1950-1960] -0.06 %/yr
[1960-1970] +0.64 %/yr
[1970-1980] +1.23 %/yr
[1980-1990] +0.07 %/yr
[1990-2000] +0.45 %/yr
[2000-2005] +0.5 %/yr
[2005-2010] +0.05 %/yr
[2010-2014] -0.07 %/yr
Looking for settlements in Spencer County? Visit this page: Settlements in Spencer County, IN
Population of Spencer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 623 | 511 | 1,134 |
| 5 to 9 | 675 | 630 | 1,305 |
| 10 to 14 | 713 | 661 | 1,374 |
| 15 to 19 | 693 | 658 | 1,351 |
| 20 to 24 | 574 | 528 | 1,102 |
| 25 to 29 | 512 | 466 | 978 |
| 30 to 34 | 617 | 545 | 1,162 |
| 35 to 39 | 591 | 604 | 1,195 |
| 40 to 44 | 618 | 650 | 1,268 |
| 45 to 49 | 729 | 677 | 1,406 |
| 50 to 54 | 883 | 837 | 1,720 |
| 55 to 59 | 839 | 819 | 1,658 |
| 60 to 64 | 719 | 680 | 1,399 |
| 65 to 69 | 645 | 646 | 1,291 |
| 70 to 74 | 453 | 477 | 930 |
| 75 to 79 | 312 | 334 | 646 |
| 80 to 84 | 191 | 271 | 462 |
| 85+ | 152 | 268 | 420 |
Spencer 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 | 10387 | 10104 | 20,491 |
| WA | 10300 | 10012 | 20,312 |
| NH | 10209 | 10018 | 20,227 |
| NHWAC | 10088 | 9881 | 19,969 |
| NHWA | 10013 | 9796 | 19,809 |
| H | 330 | 244 | 574 |
| HWAC | 299 | 223 | 522 |
| HWA | 287 | 216 | 503 |
| BAC | 147 | 125 | 272 |
| NHBAC | 122 | 106 | 228 |
| TOM | 89 | 96 | 185 |
| BA | 95 | 73 | 168 |
| NHTOM | 76 | 89 | 165 |
| NHBA | 76 | 58 | 134 |
| IAC | 54 | 60 | 114 |
| AAC | 39 | 71 | 110 |
| NHAAC | 33 | 68 | 101 |
| NHIAC | 43 | 55 | 98 |
| AA | 28 | 53 | 81 |
| NHAA | 24 | 51 | 75 |
| IA | 26 | 27 | 53 |
| HBAC | 25 | 19 | 44 |
| NHIA | 19 | 24 | 43 |
| HBA | 19 | 15 | 34 |
| HTOM | 13 | 7 | 20 |
| HIAC | 11 | 5 | 16 |
| HIA | 7 | 3 | 10 |
| HAAC | 6 | 3 | 9 |
| NAC | 4 | 3 | 7 |
| HAA | 4 | 2 | 6 |
| NHNAC | 2 | 2 | 4 |
| HNAC | 2 | 1 | 3 |
| NA | 1 | 1 | 2 |
| NHNA | 1 | 0 | 1 |
| HNA | 0 | 1 | 1 |
• Vanderburgh County population
31.3 mi, 
271°
• Daviess County
19.7 mi, 
192°
• Warrick County
15.5 mi, 
293°
• Henderson County
34.1 mi, 
243°
• Dubois County
26.2 mi, 
16°
• Breckinridge County
35.3 mi, 
116°
• Perry County
21.5 mi, 
76°
• Pike County
29.4 mi, 
335°
• McLean County
36.2 mi, 
202°
• Hancock County
16.5 mi, 
134°
[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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