Last official estimated population of Marion County was 33,248 (year 2014)[1]. This was 0.01% of total US population and 1.1% of total Iowa state population. Area of Marion County is 570.5 mi² (=1477.6 km²), in this year population density was 58.28 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Marion County population in 2026 would be 33,066 [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] +11.86 %/yr
[1860-1870] +3.81 %/yr
[1870-1880] +0.27 %/yr
[1880-1890] -0.85 %/yr
[1890-1900] +0.47 %/yr
[1900-1910] -0.49 %/yr
[1910-1920] +0.82 %/yr
[1920-1930] +0.3 %/yr
[1930-1940] +0.49 %/yr
[1940-1950] -0.41 %/yr
[1950-1960] -0.02 %/yr
[1960-1970] +0.18 %/yr
[1970-1980] +1.19 %/yr
[1980-1990] +0.11 %/yr
[1990-2000] +0.66 %/yr
[2000-2005] +0.45 %/yr
[2005-2010] +0.32 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, IA
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1022 | 1004 | 2,026 |
| 5 to 9 | 1216 | 1101 | 2,317 |
| 10 to 14 | 1231 | 1085 | 2,316 |
| 15 to 19 | 1257 | 1284 | 2,541 |
| 20 to 24 | 1240 | 1179 | 2,419 |
| 25 to 29 | 888 | 803 | 1,691 |
| 30 to 34 | 964 | 956 | 1,920 |
| 35 to 39 | 992 | 919 | 1,911 |
| 40 to 44 | 971 | 960 | 1,931 |
| 45 to 49 | 1019 | 1010 | 2,029 |
| 50 to 54 | 1223 | 1182 | 2,405 |
| 55 to 59 | 1174 | 1134 | 2,308 |
| 60 to 64 | 1035 | 1030 | 2,065 |
| 65 to 69 | 782 | 828 | 1,610 |
| 70 to 74 | 603 | 676 | 1,279 |
| 75 to 79 | 446 | 563 | 1,009 |
| 80 to 84 | 341 | 454 | 795 |
| 85+ | 259 | 534 | 793 |
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 | 16349 | 16386 | 32,735 |
| WAC | 16162 | 16290 | 32,452 |
| WA | 16007 | 16127 | 32,134 |
| NHWAC | 15881 | 15999 | 31,880 |
| NHWA | 15741 | 15843 | 31,584 |
| H | 314 | 316 | 630 |
| HWAC | 281 | 291 | 572 |
| HWA | 266 | 284 | 550 |
| AAC | 268 | 275 | 543 |
| NHAAC | 261 | 274 | 535 |
| BAC | 286 | 195 | 481 |
| AA | 235 | 238 | 473 |
| NHAA | 232 | 238 | 470 |
| NHBAC | 268 | 184 | 452 |
| BA | 214 | 123 | 337 |
| TOM | 164 | 169 | 333 |
| NHBA | 199 | 115 | 314 |
| NHTOM | 148 | 162 | 310 |
| IAC | 115 | 98 | 213 |
| NHIAC | 92 | 79 | 171 |
| IA | 42 | 39 | 81 |
| NHIA | 28 | 23 | 51 |
| HIAC | 23 | 19 | 42 |
| HIA | 14 | 16 | 30 |
| HBAC | 18 | 11 | 29 |
| HTOM | 16 | 7 | 23 |
| HBA | 15 | 8 | 23 |
| NAC | 5 | 16 | 21 |
| NHNAC | 4 | 15 | 19 |
| HAAC | 7 | 1 | 8 |
| NA | 1 | 6 | 7 |
| NHNA | 1 | 5 | 6 |
| HAA | 3 | 0 | 3 |
| HNAC | 1 | 1 | 2 |
| HNA | 0 | 1 | 1 |
• Polk County population
34.6 mi, 
314°
• Warren County
24.4 mi, 
270°
• Jasper County
24.6 mi, 
4°
• Wapello County
41.2 mi, 
120°
• Mahaska County
23.7 mi, 
90°
• Poweshiek County
38.3 mi, 
50°
• Appanoose County
42.2 mi, 
164°
• Clarke County
41.5 mi, 
239°
• Lucas County
24 mi, 
210°
• Monroe County
23.9 mi, 
150°
[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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