Last official estimated population of Marion County was 56,518 (year 2014)[1]. This was 0.018% of total US population and 3.1% of total West Virginia state population. Area of Marion County is 311.5 mi² (=806.8 km²), in this year population density was 181.43 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Marion County population in 2026 would be 56,819 [0].
Historical population of Marion County for period 1850-2014 [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

[1850-1860] +1.89 %/yr
[1860-1870] -0.49 %/yr
[1870-1880] +3.57 %/yr
[1880-1890] +1.88 %/yr
[1890-1900] +4.58 %/yr
[1900-1910] +2.81 %/yr
[1910-1920] +2.46 %/yr
[1920-1930] +2.02 %/yr
[1930-1940] +0.3 %/yr
[1940-1950] +0.41 %/yr
[1950-1960] -1.15 %/yr
[1960-1970] -0.38 %/yr
[1970-1980] +0.7 %/yr
[1980-1990] -1.38 %/yr
[1990-2000] -0.11 %/yr
[2000-2005] -0.19 %/yr
[2005-2010] +0.12 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, WV
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1596 | 1673 | 3,269 |
| 5 to 9 | 1586 | 1501 | 3,087 |
| 10 to 14 | 1588 | 1495 | 3,083 |
| 15 to 19 | 1852 | 1706 | 3,558 |
| 20 to 24 | 2374 | 2395 | 4,769 |
| 25 to 29 | 1564 | 1495 | 3,059 |
| 30 to 34 | 1716 | 1686 | 3,402 |
| 35 to 39 | 1739 | 1645 | 3,384 |
| 40 to 44 | 1771 | 1821 | 3,592 |
| 45 to 49 | 1884 | 1750 | 3,634 |
| 50 to 54 | 1713 | 1862 | 3,575 |
| 55 to 59 | 2123 | 2065 | 4,188 |
| 60 to 64 | 1968 | 1940 | 3,908 |
| 65 to 69 | 1565 | 1792 | 3,357 |
| 70 to 74 | 1122 | 1322 | 2,444 |
| 75 to 79 | 771 | 1020 | 1,791 |
| 80 to 84 | 500 | 737 | 1,237 |
| 85+ | 497 | 969 | 1,466 |
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 | 27523 | 28585 | 56,108 |
| WAC | 26608 | 27674 | 54,282 |
| NHWAC | 26239 | 27409 | 53,648 |
| WA | 26173 | 27263 | 53,436 |
| NHWA | 25819 | 27016 | 52,835 |
| BAC | 1327 | 1202 | 2,529 |
| NHBAC | 1295 | 1182 | 2,477 |
| BA | 1066 | 942 | 2,008 |
| NHBA | 1044 | 931 | 1,975 |
| TOM | 452 | 434 | 886 |
| NHTOM | 435 | 412 | 847 |
| H | 406 | 289 | 695 |
| HWAC | 369 | 265 | 634 |
| HWA | 354 | 247 | 601 |
| IAC | 228 | 228 | 456 |
| AAC | 220 | 212 | 432 |
| NHAAC | 214 | 208 | 422 |
| NHIAC | 214 | 207 | 421 |
| AA | 154 | 161 | 315 |
| NHAA | 151 | 161 | 312 |
| IA | 77 | 71 | 148 |
| NHIA | 69 | 62 | 131 |
| HBAC | 32 | 20 | 52 |
| NAC | 24 | 17 | 41 |
| HTOM | 17 | 22 | 39 |
| HIAC | 14 | 21 | 35 |
| HBA | 22 | 11 | 33 |
| NHNAC | 20 | 13 | 33 |
| HIA | 8 | 9 | 17 |
| NA | 7 | 3 | 10 |
| HAAC | 6 | 4 | 10 |
| NHNA | 5 | 3 | 8 |
| HNAC | 4 | 4 | 8 |
| HAA | 3 | 0 | 3 |
| HNA | 2 | 0 | 2 |
• Monongalia County population
13.2 mi,
48°
• Harrison County
17.4 mi,
206°
• Greene County
23.6 mi,
2°
• Preston County
30.7 mi,
94°
• Marshall County
33.1 mi,
316°
• Taylor County
15.9 mi,
138°
• Barbour County
28.5 mi,
152°
• Wetzel County
21.5 mi,
287°
• Tyler County
33.9 mi,
265°
• Doddridge County
29.6 mi,
235°
[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
See note 15 West Virginia Notes
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