Last official estimated population of Marion County was 12,663 (year 2014)[1]. This was 0.004% of total US population and 0.4% of total Kansas state population. Area of Marion County is 953.7 mi² (=2470.2 km²), in this year population density was 13.28 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Marion County population in 2025 would be 12,671 [0].
Historical population of Marion County for period 1860-2014 [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
[1860-1870] +26.36 %/yr
[1870-1880] +32.13 %/yr
[1880-1890] +5.13 %/yr
[1890-1900] +0.07 %/yr
[1900-1910] +0.81 %/yr
[1910-1920] +0.22 %/yr
[1920-1930] -1 %/yr
[1930-1940] -0.9 %/yr
[1940-1950] -1.49 %/yr
[1950-1960] -0.74 %/yr
[1960-1970] -0.83 %/yr
[1970-1980] -0.3 %/yr
[1980-1990] -0.48 %/yr
[1990-2000] +0.36 %/yr
[2000-2005] -0.52 %/yr
[2005-2010] -0.55 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, KS
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 307 | 305 | 612 |
| 5 to 9 | 380 | 348 | 728 |
| 10 to 14 | 413 | 383 | 796 |
| 15 to 19 | 469 | 429 | 898 |
| 20 to 24 | 434 | 373 | 807 |
| 25 to 29 | 279 | 269 | 548 |
| 30 to 34 | 288 | 279 | 567 |
| 35 to 39 | 290 | 289 | 579 |
| 40 to 44 | 277 | 271 | 548 |
| 45 to 49 | 361 | 338 | 699 |
| 50 to 54 | 456 | 463 | 919 |
| 55 to 59 | 515 | 459 | 974 |
| 60 to 64 | 418 | 397 | 815 |
| 65 to 69 | 368 | 385 | 753 |
| 70 to 74 | 288 | 307 | 595 |
| 75 to 79 | 224 | 253 | 477 |
| 80 to 84 | 159 | 211 | 370 |
| 85+ | 178 | 345 | 523 |
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 |
| WAC | 5931 | 5978 | 11,909 |
| NH | 5914 | 5909 | 11,823 |
| WA | 5842 | 5876 | 11,718 |
| NHWAC | 5754 | 5803 | 11,557 |
| NHWA | 5676 | 5714 | 11,390 |
| H | 190 | 195 | 385 |
| HWAC | 177 | 175 | 352 |
| HWA | 166 | 162 | 328 |
| IAC | 113 | 110 | 223 |
| TOM | 94 | 108 | 202 |
| BAC | 117 | 81 | 198 |
| NHIAC | 101 | 89 | 190 |
| NHBAC | 107 | 72 | 179 |
| NHTOM | 82 | 95 | 177 |
| BA | 91 | 52 | 143 |
| NHBA | 84 | 46 | 130 |
| IA | 51 | 44 | 95 |
| NHIA | 48 | 31 | 79 |
| AAC | 35 | 41 | 76 |
| NHAAC | 32 | 37 | 69 |
| AA | 20 | 22 | 42 |
| NHAA | 18 | 22 | 40 |
| HIAC | 12 | 21 | 33 |
| HTOM | 12 | 13 | 25 |
| HBAC | 10 | 9 | 19 |
| NAC | 9 | 9 | 18 |
| HIA | 3 | 13 | 16 |
| NHNAC | 8 | 7 | 15 |
| HBA | 7 | 6 | 13 |
| NA | 6 | 2 | 8 |
| NHNA | 6 | 1 | 7 |
| HAAC | 3 | 4 | 7 |
| HNAC | 1 | 2 | 3 |
| HAA | 2 | 0 | 2 |
| HNA | 0 | 1 | 1 |
• Sedgwick County population
50.8 mi, 
202°
• Butler County
43 mi, 
160°
• Saline County
41.8 mi, 
314°
• Geary County
47.9 mi, 
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• Harvey County
28 mi, 
220°
• Lyon County
51.4 mi, 
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• McPherson County
29.6 mi, 
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• Dickinson County
35.2 mi, 
355°
• Morris County
33.3 mi, 
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• Chase County
27.9 mi, 
98°
[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
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