Last official estimated population of Marion County was 904,710 (year 2014)[1]. This was 0.284% of total US population and 13.7% of total Indiana state population. Area of Marion County is 403.0 mi² (=1043.8 km²), in this year population density was 2,244.88 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Marion County population in 2026 would be 908,673 [0].
Historical population of Marion County for period 1830-2014 [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
[1830-1840] +8.38 %/yr
[1840-1850] +4.13 %/yr
[1850-1860] +5.16 %/yr
[1860-1870] +6.08 %/yr
[1870-1880] +3.63 %/yr
[1880-1890] +3.22 %/yr
[1890-1900] +3.4 %/yr
[1900-1910] +2.95 %/yr
[1910-1920] +2.82 %/yr
[1920-1930] +1.96 %/yr
[1930-1940] +0.87 %/yr
[1940-1950] +1.82 %/yr
[1950-1960] +2.37 %/yr
[1960-1970] +1.28 %/yr
[1970-1980] -0.35 %/yr
[1980-1990] +0.41 %/yr
[1990-2000] +0.77 %/yr
[2000-2005] +0.3 %/yr
[2005-2010] +0.68 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, IN
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 36168 | 34376 | 70,544 |
| 5 to 9 | 33613 | 32341 | 65,954 |
| 10 to 14 | 31313 | 30097 | 61,410 |
| 15 to 19 | 28535 | 28449 | 56,984 |
| 20 to 24 | 33437 | 36033 | 69,470 |
| 25 to 29 | 38197 | 41991 | 80,188 |
| 30 to 34 | 35714 | 37569 | 73,283 |
| 35 to 39 | 30204 | 31340 | 61,544 |
| 40 to 44 | 28740 | 29949 | 58,689 |
| 45 to 49 | 27911 | 29266 | 57,177 |
| 50 to 54 | 30583 | 32989 | 63,572 |
| 55 to 59 | 28936 | 31786 | 60,722 |
| 60 to 64 | 22886 | 26377 | 49,263 |
| 65 to 69 | 16182 | 19297 | 35,479 |
| 70 to 74 | 10445 | 13683 | 24,128 |
| 75 to 79 | 7223 | 10406 | 17,629 |
| 80 to 84 | 5063 | 8230 | 13,293 |
| 85+ | 4698 | 10216 | 14,914 |
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 | 401333 | 441138 | 842,471 |
| WAC | 314737 | 327944 | 642,681 |
| WA | 303549 | 316222 | 619,771 |
| NHWAC | 271455 | 289582 | 561,037 |
| NHWA | 261676 | 279228 | 540,904 |
| BAC | 127931 | 149237 | 277,168 |
| NHBAC | 123812 | 145160 | 268,972 |
| BA | 119410 | 140148 | 259,558 |
| NHBA | 116304 | 137053 | 253,357 |
| H | 48515 | 43257 | 91,772 |
| HWAC | 43282 | 38362 | 81,644 |
| HWA | 41873 | 36994 | 78,867 |
| AAC | 14393 | 15169 | 29,562 |
| NHAAC | 13849 | 14642 | 28,491 |
| TOM | 12236 | 12933 | 25,169 |
| AA | 11853 | 12535 | 24,388 |
| NHAA | 11558 | 12278 | 23,836 |
| NHTOM | 10690 | 11435 | 22,125 |
| IAC | 5576 | 5642 | 11,218 |
| HBAC | 4119 | 4077 | 8,196 |
| NHIAC | 3391 | 3769 | 7,160 |
| HBA | 3106 | 3095 | 6,201 |
| IA | 2486 | 2235 | 4,721 |
| HIAC | 2185 | 1873 | 4,058 |
| HTOM | 1546 | 1498 | 3,044 |
| HIA | 1517 | 1227 | 2,744 |
| NHIA | 969 | 1008 | 1,977 |
| NAC | 738 | 767 | 1,505 |
| HAAC | 544 | 527 | 1,071 |
| NHNAC | 477 | 487 | 964 |
| NA | 314 | 322 | 636 |
| HAA | 295 | 257 | 552 |
| HNAC | 261 | 280 | 541 |
| HNA | 178 | 186 | 364 |
| NHNA | 136 | 136 | 272 |
• Hamilton County population
19.7 mi, 
17°
• Hendricks County
19.9 mi, 
267°
• Johnson County
19.9 mi, 
173°
• Madison County
34.4 mi, 
39°
• Hancock County
19.4 mi, 
81°
• Morgan County
26.6 mi, 
218°
• Boone County
25.6 mi, 
316°
• Shelby County
25.6 mi, 
134°
• Rush County
37.3 mi, 
107°
• Tipton County
36.7 mi, 
6°
[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
*Delaware Indiana Notes
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