Last official estimated population of Marshall County was 40,682 (year 2014)[1]. This was 0.013% of total US population and 1.3% of total Iowa state population. Area of Marshall County is 573.2 mi² (=1484.6 km²), in this year population density was 70.97 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Marshall County population in 2026 would be 40,784 [0].
Historical population of Marshall 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] +33.36 %/yr
[1860-1870] +11.32 %/yr
[1870-1880] +3.06 %/yr
[1880-1890] +0.85 %/yr
[1890-1900] +1.5 %/yr
[1900-1910] +0.1 %/yr
[1910-1920] +0.75 %/yr
[1920-1930] +0.33 %/yr
[1930-1940] +0.49 %/yr
[1940-1950] +0.06 %/yr
[1950-1960] +0.65 %/yr
[1960-1970] +0.79 %/yr
[1970-1980] +0.14 %/yr
[1980-1990] -0.84 %/yr
[1990-2000] +0.27 %/yr
[2000-2005] +0.16 %/yr
[2005-2010] +0.5 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Marshall County? Visit this page: Settlements in Marshall County, IA
Population of Marshall County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1457 | 1411 | 2,868 |
| 5 to 9 | 1513 | 1397 | 2,910 |
| 10 to 14 | 1436 | 1370 | 2,806 |
| 15 to 19 | 1400 | 1237 | 2,637 |
| 20 to 24 | 1351 | 1164 | 2,515 |
| 25 to 29 | 1245 | 1100 | 2,345 |
| 30 to 34 | 1275 | 1153 | 2,428 |
| 35 to 39 | 1107 | 1055 | 2,162 |
| 40 to 44 | 1120 | 1145 | 2,265 |
| 45 to 49 | 1235 | 1176 | 2,411 |
| 50 to 54 | 1449 | 1343 | 2,792 |
| 55 to 59 | 1400 | 1459 | 2,859 |
| 60 to 64 | 1406 | 1322 | 2,728 |
| 65 to 69 | 1023 | 1081 | 2,104 |
| 70 to 74 | 768 | 861 | 1,629 |
| 75 to 79 | 592 | 646 | 1,238 |
| 80 to 84 | 401 | 590 | 991 |
| 85+ | 442 | 736 | 1,178 |
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 | 19274 | 19221 | 38,495 |
| WA | 18900 | 18879 | 37,779 |
| NH | 16332 | 16401 | 32,733 |
| NHWAC | 15169 | 15542 | 30,711 |
| NHWA | 14902 | 15307 | 30,209 |
| H | 4288 | 3845 | 8,133 |
| HWAC | 4105 | 3679 | 7,784 |
| HWA | 3998 | 3572 | 7,570 |
| AAC | 705 | 593 | 1,298 |
| NHAAC | 669 | 565 | 1,234 |
| BAC | 714 | 457 | 1,171 |
| AA | 614 | 517 | 1,131 |
| NHAA | 598 | 501 | 1,099 |
| NHBAC | 605 | 373 | 978 |
| BA | 509 | 293 | 802 |
| TOM | 393 | 359 | 752 |
| NHBA | 455 | 255 | 710 |
| IAC | 286 | 302 | 588 |
| NHTOM | 279 | 246 | 525 |
| IA | 166 | 168 | 334 |
| HIAC | 145 | 162 | 307 |
| NHIAC | 141 | 140 | 281 |
| HTOM | 114 | 113 | 227 |
| HBAC | 109 | 84 | 193 |
| HIA | 92 | 96 | 188 |
| NHIA | 74 | 72 | 146 |
| NAC | 55 | 47 | 102 |
| HBA | 54 | 38 | 92 |
| NHNAC | 37 | 32 | 69 |
| NA | 38 | 30 | 68 |
| HAAC | 36 | 28 | 64 |
| NHNA | 24 | 20 | 44 |
| HNAC | 18 | 15 | 33 |
| HAA | 16 | 16 | 32 |
| HNA | 14 | 10 | 24 |
• Polk County population
39 mi, 
230°
• Black Hawk County
45.5 mi, 
49°
• Story County
24.9 mi, 
269°
• Jasper County
24.9 mi, 
188°
• Benton County
47.5 mi, 
85°
• Poweshiek County
34.1 mi, 
136°
• Tama County
23.3 mi, 
84°
• Hardin County
27.5 mi, 
331°
• Hamilton County
44.4 mi, 
302°
• Grundy County
26.8 mi, 
21°
[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
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