Last official estimated population of Marion County was 28,792 (year 2014)[1]. This was 0.009% of total US population and 0.5% of total Missouri state population. Area of Marion County is 444.3 mi² (=1150.7 km²), in this year population density was 64.80 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Marion County population in 2025 would be 28,822 [0].
Historical population of Marion 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] +7.12 %/yr
[1840-1850] +2.43 %/yr
[1850-1860] +4.41 %/yr
[1860-1870] +2.36 %/yr
[1870-1880] +0.44 %/yr
[1880-1890] +0.55 %/yr
[1890-1900] +0.04 %/yr
[1900-1910] +1.5 %/yr
[1910-1920] -0.11 %/yr
[1920-1930] +1.03 %/yr
[1930-1940] -0.59 %/yr
[1940-1950] -0.59 %/yr
[1950-1960] -0.08 %/yr
[1960-1970] -0.49 %/yr
[1970-1980] +0.18 %/yr
[1980-1990] -0.34 %/yr
[1990-2000] +0.21 %/yr
[2000-2005] +0.03 %/yr
[2005-2010] +0.33 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, MO
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 896 | 921 | 1,817 |
| 5 to 9 | 955 | 977 | 1,932 |
| 10 to 14 | 988 | 940 | 1,928 |
| 15 to 19 | 901 | 955 | 1,856 |
| 20 to 24 | 949 | 974 | 1,923 |
| 25 to 29 | 838 | 863 | 1,701 |
| 30 to 34 | 866 | 959 | 1,825 |
| 35 to 39 | 823 | 834 | 1,657 |
| 40 to 44 | 858 | 853 | 1,711 |
| 45 to 49 | 869 | 874 | 1,743 |
| 50 to 54 | 1062 | 1047 | 2,109 |
| 55 to 59 | 981 | 1013 | 1,994 |
| 60 to 64 | 915 | 928 | 1,843 |
| 65 to 69 | 715 | 762 | 1,477 |
| 70 to 74 | 508 | 578 | 1,086 |
| 75 to 79 | 360 | 491 | 851 |
| 80 to 84 | 272 | 428 | 700 |
| 85+ | 254 | 513 | 767 |
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 | 13786 | 14678 | 28,464 |
| WAC | 13104 | 13981 | 27,085 |
| NHWAC | 12904 | 13773 | 26,677 |
| WA | 12811 | 13653 | 26,464 |
| NHWA | 12633 | 13459 | 26,092 |
| BAC | 934 | 979 | 1,913 |
| NHBAC | 910 | 955 | 1,865 |
| BA | 745 | 765 | 1,510 |
| NHBA | 730 | 746 | 1,476 |
| TOM | 302 | 340 | 642 |
| NHTOM | 280 | 326 | 606 |
| H | 224 | 232 | 456 |
| HWAC | 200 | 208 | 408 |
| HWA | 178 | 194 | 372 |
| AAC | 140 | 150 | 290 |
| NHAAC | 132 | 146 | 278 |
| IAC | 122 | 118 | 240 |
| AA | 108 | 115 | 223 |
| NHAA | 103 | 113 | 216 |
| NHIAC | 104 | 110 | 214 |
| NAC | 29 | 30 | 59 |
| IA | 31 | 26 | 57 |
| NHNAC | 28 | 27 | 55 |
| NHIA | 27 | 24 | 51 |
| HBAC | 24 | 24 | 48 |
| HTOM | 22 | 14 | 36 |
| HBA | 15 | 19 | 34 |
| HIAC | 18 | 8 | 26 |
| NA | 13 | 11 | 24 |
| NHNA | 13 | 10 | 23 |
| HAAC | 8 | 4 | 12 |
| HAA | 5 | 2 | 7 |
| HIA | 4 | 2 | 6 |
| HNAC | 1 | 3 | 4 |
| HNA | 0 | 1 | 1 |
• Adams County population
26.4 mi, 
62°
• Audrain County
42.4 mi, 
195°
• Pike County
40.7 mi, 
142°
• Pike County
41.6 mi, 
107°
• Lewis County
19.8 mi, 
345°
• Ralls County
18.5 mi, 
161°
• Monroe County
29.1 mi, 
222°
• Clark County
41.7 mi, 353°
• Shelby County
24.1 mi, 
268°
• Knox County
35.4 mi, 
310°
[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
*Pike Missouri Notes
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