Last official estimated population of Marion County was 19,811 (year 2014)[1]. This was 0.006% of total US population and 0.4% of total Kentucky state population. Area of Marion County is 346.9 mi² (=898.4 km²), in this year population density was 57.12 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Marion County population in 2026 would be 19,784 [0].
Historical population of Marion County for period 1840-2014 [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

[1840-1850] +0.65 %/yr
[1850-1860] +0.68 %/yr
[1860-1870] +0.19 %/yr
[1870-1880] +1.36 %/yr
[1880-1890] +0.63 %/yr
[1890-1900] +0.4 %/yr
[1900-1910] +0.02 %/yr
[1910-1920] -0.5 %/yr
[1920-1930] -0.02 %/yr
[1930-1940] +0.88 %/yr
[1940-1950] +0.18 %/yr
[1950-1960] -0.19 %/yr
[1960-1970] -0.1 %/yr
[1970-1980] +0.69 %/yr
[1980-1990] -0.82 %/yr
[1990-2000] +1.01 %/yr
[2000-2005] +1.08 %/yr
[2005-2010] +0.58 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, KY
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 648 | 591 | 1,239 |
| 5 to 9 | 669 | 658 | 1,327 |
| 10 to 14 | 685 | 667 | 1,352 |
| 15 to 19 | 663 | 590 | 1,253 |
| 20 to 24 | 694 | 569 | 1,263 |
| 25 to 29 | 717 | 502 | 1,219 |
| 30 to 34 | 801 | 602 | 1,403 |
| 35 to 39 | 777 | 547 | 1,324 |
| 40 to 44 | 680 | 612 | 1,292 |
| 45 to 49 | 741 | 675 | 1,416 |
| 50 to 54 | 774 | 712 | 1,486 |
| 55 to 59 | 670 | 669 | 1,339 |
| 60 to 64 | 569 | 563 | 1,132 |
| 65 to 69 | 490 | 506 | 996 |
| 70 to 74 | 336 | 361 | 697 |
| 75 to 79 | 194 | 273 | 467 |
| 80 to 84 | 134 | 239 | 373 |
| 85+ | 125 | 304 | 429 |
Marion 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 | 10099 | 9427 | 19,526 |
| WAC | 9238 | 8860 | 18,098 |
| WA | 9090 | 8713 | 17,803 |
| NHWAC | 8994 | 8663 | 17,657 |
| NHWA | 8852 | 8524 | 17,376 |
| BAC | 1116 | 776 | 1,892 |
| NHBAC | 1095 | 764 | 1,859 |
| BA | 1006 | 678 | 1,684 |
| NHBA | 990 | 670 | 1,660 |
| H | 268 | 213 | 481 |
| HWAC | 244 | 197 | 441 |
| HWA | 238 | 189 | 427 |
| TOM | 154 | 151 | 305 |
| NHTOM | 147 | 141 | 288 |
| AAC | 108 | 100 | 208 |
| NHAAC | 104 | 97 | 201 |
| AA | 91 | 86 | 177 |
| NHAA | 89 | 84 | 173 |
| IAC | 57 | 51 | 108 |
| NHIAC | 51 | 42 | 93 |
| HBAC | 21 | 12 | 33 |
| IA | 21 | 11 | 32 |
| NHIA | 19 | 8 | 27 |
| HBA | 16 | 8 | 24 |
| HTOM | 7 | 10 | 17 |
| NAC | 8 | 8 | 16 |
| HIAC | 6 | 9 | 15 |
| NHNAC | 4 | 6 | 10 |
| HAAC | 4 | 3 | 7 |
| NA | 5 | 1 | 6 |
| HNAC | 4 | 2 | 6 |
| HIA | 2 | 3 | 5 |
| HNA | 3 | 1 | 4 |
| HAA | 2 | 2 | 4 |
| NHNA | 2 | 0 | 2 |
• Nelson County population
20.4 mi,
328°
• Boyle County
22.4 mi,
78°
• Taylor County
13.3 mi,
194°
• Mercer County
27.8 mi,
49°
• Adair County
30.9 mi,
181°
• Spencer County
32.7 mi,
355°
• Casey County
24.6 mi,
130°
• Larue County
23.4 mi,
268°
• Washington County
14.8 mi,
20°
• Green County
25.3 mi,
219°
[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
*Washington Kentucky Notes
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