Last official estimated population of Marion County was 27,054 (year 2014)[1]. This was 0.008% of total US population and 0.9% of total Mississippi state population. Area of Marion County is 548.6 mi² (=1420.9 km²), in this year population density was 49.31 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Marion County population in 2025 would be 26,961 [0].
Historical population of Marion 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] +1.71 %/yr
[1830-1840] +0.37 %/yr
[1840-1850] +1.42 %/yr
[1850-1860] +0.61 %/yr
[1860-1870] -1.06 %/yr
[1870-1880] +5.06 %/yr
[1880-1890] +3.28 %/yr
[1890-1900] +3.54 %/yr
[1900-1910] +1.45 %/yr
[1910-1920] +0.95 %/yr
[1920-1930] +1.51 %/yr
[1930-1940] +1.92 %/yr
[1940-1950] -0.05 %/yr
[1950-1960] -0.28 %/yr
[1960-1970] -0.18 %/yr
[1970-1980] +1.18 %/yr
[1980-1990] -0.06 %/yr
[1990-2000] +0.03 %/yr
[2000-2005] +0.06 %/yr
[2005-2010] +1.05 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, MS
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 845 | 831 | 1,676 |
| 5 to 9 | 907 | 940 | 1,847 |
| 10 to 14 | 896 | 821 | 1,717 |
| 15 to 19 | 803 | 803 | 1,606 |
| 20 to 24 | 806 | 814 | 1,620 |
| 25 to 29 | 793 | 791 | 1,584 |
| 30 to 34 | 831 | 848 | 1,679 |
| 35 to 39 | 787 | 735 | 1,522 |
| 40 to 44 | 777 | 805 | 1,582 |
| 45 to 49 | 728 | 791 | 1,519 |
| 50 to 54 | 879 | 946 | 1,825 |
| 55 to 59 | 859 | 914 | 1,773 |
| 60 to 64 | 779 | 832 | 1,611 |
| 65 to 69 | 663 | 728 | 1,391 |
| 70 to 74 | 438 | 546 | 984 |
| 75 to 79 | 328 | 451 | 779 |
| 80 to 84 | 234 | 372 | 606 |
| 85+ | 154 | 393 | 547 |
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 | 12313 | 13188 | 25,501 |
| WAC | 8393 | 8885 | 17,278 |
| WA | 8284 | 8787 | 17,071 |
| NHWAC | 8230 | 8741 | 16,971 |
| NHWA | 8130 | 8650 | 16,780 |
| BAC | 4103 | 4445 | 8,548 |
| NHBAC | 4074 | 4420 | 8,494 |
| BA | 4032 | 4362 | 8,394 |
| NHBA | 4011 | 4346 | 8,357 |
| H | 194 | 173 | 367 |
| HWAC | 163 | 144 | 307 |
| HWA | 154 | 137 | 291 |
| TOM | 128 | 123 | 251 |
| NHTOM | 112 | 111 | 223 |
| AAC | 68 | 80 | 148 |
| IAC | 69 | 72 | 141 |
| NHAAC | 60 | 75 | 135 |
| NHIAC | 61 | 61 | 122 |
| AA | 37 | 53 | 90 |
| NHAA | 36 | 52 | 88 |
| HBAC | 29 | 25 | 54 |
| IA | 23 | 28 | 51 |
| NHIA | 21 | 21 | 42 |
| HBA | 21 | 16 | 37 |
| HTOM | 16 | 12 | 28 |
| NAC | 10 | 12 | 22 |
| HIAC | 8 | 11 | 19 |
| NHNAC | 8 | 11 | 19 |
| HAAC | 8 | 5 | 13 |
| NHNA | 3 | 8 | 11 |
| NA | 3 | 8 | 11 |
| HIA | 2 | 7 | 9 |
| HNAC | 2 | 1 | 3 |
| HAA | 1 | 1 | 2 |
| HNA | 0 | 0 | 0 |
• Forrest County population
33.3 mi, 
94°
• Lamar County
18.8 mi, 
96°
• Pearl River County
34.4 mi, 
156°
• Washington Parish
29.3 mi, 
206°
• Pike County
34.2 mi, 
263°
• Lincoln County
42.8 mi, 
299°
• Covington County
32.2 mi, 
30°
• Walthall County
17.3 mi, 
254°
• Lawrence County
27.8 mi, 
322°
• Jefferson Davis County
23.2 mi, 
359°
[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
*Wayne, Amite, Franklin Mississippi Notes
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