Last official estimated population of Marshall County was 12,630 (year 2014)[1]. This was 0.004% of total US population and 0.1% of total Illinois state population. Area of Marshall County is 398.5 mi² (=1032.2 km²), in this year population density was 31.69 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Marshall County population in 2024 would be 12,605 [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] +10.85 %/yr
[1850-1860] +10 %/yr
[1860-1870] +2.35 %/yr
[1870-1880] -1.18 %/yr
[1880-1890] -0.97 %/yr
[1890-1900] +1.83 %/yr
[1900-1910] -0.43 %/yr
[1910-1920] -0.6 %/yr
[1920-1930] -1.24 %/yr
[1930-1940] +0.12 %/yr
[1940-1950] -0.12 %/yr
[1950-1960] +0.23 %/yr
[1960-1970] -0.02 %/yr
[1970-1980] +0.85 %/yr
[1980-1990] -1.19 %/yr
[1990-2000] +0.24 %/yr
[2000-2005] -0.32 %/yr
[2005-2010] -0.49 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Marshall County? Visit this page: Settlements in Marshall County, IL
Population of Marshall County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 259 | 327 | 586 |
| 5 to 9 | 342 | 322 | 664 |
| 10 to 14 | 367 | 327 | 694 |
| 15 to 19 | 375 | 323 | 698 |
| 20 to 24 | 350 | 320 | 670 |
| 25 to 29 | 280 | 292 | 572 |
| 30 to 34 | 314 | 324 | 638 |
| 35 to 39 | 332 | 325 | 657 |
| 40 to 44 | 358 | 316 | 674 |
| 45 to 49 | 362 | 380 | 742 |
| 50 to 54 | 470 | 470 | 940 |
| 55 to 59 | 459 | 465 | 924 |
| 60 to 64 | 476 | 457 | 933 |
| 65 to 69 | 360 | 377 | 737 |
| 70 to 74 | 317 | 331 | 648 |
| 75 to 79 | 203 | 265 | 468 |
| 80 to 84 | 163 | 219 | 382 |
| 85+ | 139 | 248 | 387 |
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 | 5826 | 5991 | 11,817 |
| WA | 5775 | 5940 | 11,715 |
| NH | 5734 | 5883 | 11,617 |
| NHWAC | 5651 | 5794 | 11,445 |
| NHWA | 5612 | 5749 | 11,361 |
| H | 192 | 205 | 397 |
| HWAC | 175 | 197 | 372 |
| HWA | 163 | 191 | 354 |
| AAC | 50 | 65 | 115 |
| TOM | 52 | 55 | 107 |
| NHAAC | 41 | 62 | 103 |
| BAC | 56 | 41 | 97 |
| AA | 40 | 57 | 97 |
| NHAA | 36 | 54 | 90 |
| IAC | 47 | 42 | 89 |
| NHTOM | 40 | 49 | 89 |
| NHBAC | 52 | 36 | 88 |
| NHIAC | 28 | 36 | 64 |
| BA | 36 | 19 | 55 |
| NHBA | 35 | 18 | 53 |
| IA | 21 | 15 | 36 |
| HIAC | 19 | 6 | 25 |
| NHIA | 9 | 11 | 20 |
| HTOM | 12 | 6 | 18 |
| HIA | 12 | 4 | 16 |
| HAAC | 9 | 3 | 12 |
| NAC | 5 | 4 | 9 |
| HBAC | 4 | 5 | 9 |
| NHNAC | 4 | 4 | 8 |
| HAA | 4 | 3 | 7 |
| NA | 2 | 2 | 4 |
| NHNA | 2 | 2 | 4 |
| HBA | 1 | 1 | 2 |
| HNAC | 1 | 0 | 1 |
| HNA | 0 | 0 | 0 |
• Peoria County population
27.9 mi, 
232°
• McLean County
45.3 mi, 
144°
• Tazewell County
37.3 mi, 
194°
• LaSalle County
32.1 mi, 
47°
• Knox County
46 mi, 
261°
• Livingston County
42.3 mi, 
102°
• Woodford County
18 mi, 
157°
• Bureau County
27.3 mi, 
339°
• Putnam County
11.8 mi, 
11°
• Stark County
24.1 mi, 
280°
[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
*Peoria, Putnam Illinois Notes
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