Last official estimated population of Marshall County was 47,008 (year 2014)[1]. This was 0.015% of total US population and 0.7% of total Indiana state population. Area of Marshall County is 449.7 mi² (=1164.8 km²), in this year population density was 104.52 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Marshall County population in 2021 would be 46,933 [0].
Historical population of Marshall 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] +12.47 %/yr
[1850-1860] +9.05 %/yr
[1860-1870] +4.74 %/yr
[1870-1880] +1.48 %/yr
[1880-1890] +0.17 %/yr
[1890-1900] +0.53 %/yr
[1900-1910] -0.38 %/yr
[1910-1920] -0.18 %/yr
[1920-1930] +0.55 %/yr
[1930-1940] +0.34 %/yr
[1940-1950] +1.29 %/yr
[1950-1960] +0.97 %/yr
[1960-1970] +0.76 %/yr
[1970-1980] +1.13 %/yr
[1980-1990] +0.75 %/yr
[1990-2000] +0.68 %/yr
[2000-2005] +0.62 %/yr
[2005-2010] +0.21 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Marshall County? Visit this page: Settlements in Marshall County, IN
Population of Marshall County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1537 | 1446 | 2,983 |
| 5 to 9 | 1712 | 1586 | 3,298 |
| 10 to 14 | 1791 | 1721 | 3,512 |
| 15 to 19 | 1728 | 1604 | 3,332 |
| 20 to 24 | 1532 | 1420 | 2,952 |
| 25 to 29 | 1237 | 1276 | 2,513 |
| 30 to 34 | 1368 | 1243 | 2,611 |
| 35 to 39 | 1352 | 1398 | 2,750 |
| 40 to 44 | 1428 | 1413 | 2,841 |
| 45 to 49 | 1547 | 1526 | 3,073 |
| 50 to 54 | 1674 | 1679 | 3,353 |
| 55 to 59 | 1676 | 1663 | 3,339 |
| 60 to 64 | 1441 | 1514 | 2,955 |
| 65 to 69 | 1162 | 1201 | 2,363 |
| 70 to 74 | 836 | 950 | 1,786 |
| 75 to 79 | 565 | 737 | 1,302 |
| 80 to 84 | 406 | 599 | 1,005 |
| 85+ | 342 | 797 | 1,139 |
Marshall 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 | 22867 | 23295 | 46,162 |
| WA | 22612 | 23047 | 45,659 |
| NH | 21004 | 21686 | 42,690 |
| NHWAC | 20663 | 21337 | 42,000 |
| NHWA | 20456 | 21112 | 41,568 |
| H | 2330 | 2087 | 4,417 |
| HWAC | 2204 | 1958 | 4,162 |
| HWA | 2156 | 1935 | 4,091 |
| BAC | 339 | 297 | 636 |
| TOM | 263 | 260 | 523 |
| NHBAC | 269 | 222 | 491 |
| NHTOM | 215 | 236 | 451 |
| AAC | 173 | 243 | 416 |
| BA | 227 | 180 | 407 |
| IAC | 210 | 179 | 389 |
| NHAAC | 153 | 222 | 375 |
| AA | 128 | 197 | 325 |
| NHAA | 117 | 180 | 297 |
| NHBA | 172 | 112 | 284 |
| NHIAC | 137 | 133 | 270 |
| IA | 87 | 75 | 162 |
| HBAC | 70 | 75 | 145 |
| HBA | 55 | 68 | 123 |
| HIAC | 73 | 46 | 119 |
| NHIA | 44 | 43 | 87 |
| HIA | 43 | 32 | 75 |
| HTOM | 48 | 24 | 72 |
| NAC | 24 | 27 | 51 |
| HAAC | 20 | 21 | 41 |
| NA | 17 | 14 | 31 |
| HNAC | 18 | 12 | 30 |
| HNA | 17 | 11 | 28 |
| HAA | 11 | 17 | 28 |
| NHNAC | 6 | 15 | 21 |
| NHNA | 0 | 3 | 3 |
• St. Joseph County population
20.2 mi, 
357°
• Elkhart County
28.3 mi, 
47°
• Berrien County
40.5 mi, 
322°
• LaPorte County
29.1 mi, 
302°
• Kosciusko County
21.9 mi, 
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• Cass County
39.7 mi, 
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• Miami County
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• Starke County
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• Fulton County
19 mi, 
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• Pulaski County
29.3 mi, 
228°
[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
*Cass, St. Joseph Indiana Notes
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