Last official estimated population of Marion County was 39,455 (year 2014)[1]. This was 0.012% of total US population and 0.3% of total Illinois state population. Area of Marion County is 576.0 mi² (=1491.9 km²), in this year population density was 68.49 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Marion County population in 2026 would be 39,509 [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] +8.36 %/yr
[1840-1850] +3.55 %/yr
[1850-1860] +6.6 %/yr
[1860-1870] +4.93 %/yr
[1870-1880] +1.39 %/yr
[1880-1890] +0.27 %/yr
[1890-1900] +2.26 %/yr
[1900-1910] +1.43 %/yr
[1910-1920] +0.66 %/yr
[1920-1930] -0.51 %/yr
[1930-1940] +3.02 %/yr
[1940-1950] -1.39 %/yr
[1950-1960] -0.58 %/yr
[1960-1970] -0.09 %/yr
[1970-1980] +1.11 %/yr
[1980-1990] -0.46 %/yr
[1990-2000] +0.03 %/yr
[2000-2005] -0.85 %/yr
[2005-2010] -0.25 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, IL
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1252 | 1181 | 2,433 |
| 5 to 9 | 1317 | 1228 | 2,545 |
| 10 to 14 | 1201 | 1183 | 2,384 |
| 15 to 19 | 1158 | 1159 | 2,317 |
| 20 to 24 | 1245 | 1178 | 2,423 |
| 25 to 29 | 1041 | 1072 | 2,113 |
| 30 to 34 | 1113 | 1102 | 2,215 |
| 35 to 39 | 1093 | 1057 | 2,150 |
| 40 to 44 | 1114 | 1156 | 2,270 |
| 45 to 49 | 1152 | 1151 | 2,303 |
| 50 to 54 | 1387 | 1483 | 2,870 |
| 55 to 59 | 1424 | 1471 | 2,895 |
| 60 to 64 | 1231 | 1318 | 2,549 |
| 65 to 69 | 1037 | 1153 | 2,190 |
| 70 to 74 | 790 | 883 | 1,673 |
| 75 to 79 | 546 | 706 | 1,252 |
| 80 to 84 | 373 | 509 | 882 |
| 85+ | 388 | 719 | 1,107 |
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 | 18445 | 19418 | 37,863 |
| WAC | 17867 | 18724 | 36,591 |
| WA | 17567 | 18432 | 35,999 |
| NHWAC | 17499 | 18474 | 35,973 |
| NHWA | 17222 | 18191 | 35,413 |
| BAC | 1013 | 995 | 2,008 |
| NHBAC | 973 | 967 | 1,940 |
| BA | 793 | 774 | 1,567 |
| NHBA | 766 | 752 | 1,518 |
| H | 417 | 291 | 708 |
| TOM | 314 | 309 | 623 |
| HWAC | 368 | 250 | 618 |
| NHTOM | 291 | 298 | 589 |
| HWA | 345 | 241 | 586 |
| AAC | 161 | 172 | 333 |
| NHAAC | 158 | 168 | 326 |
| IAC | 140 | 119 | 259 |
| AA | 111 | 130 | 241 |
| NHAA | 111 | 128 | 239 |
| NHIAC | 106 | 99 | 205 |
| IA | 70 | 61 | 131 |
| NHIA | 49 | 46 | 95 |
| HBAC | 40 | 28 | 68 |
| HIAC | 34 | 20 | 54 |
| HBA | 27 | 22 | 49 |
| HIA | 21 | 15 | 36 |
| HTOM | 23 | 11 | 34 |
| NAC | 17 | 13 | 30 |
| NHNAC | 15 | 13 | 28 |
| NA | 7 | 3 | 10 |
| NHNA | 6 | 3 | 9 |
| HAAC | 3 | 4 | 7 |
| HNAC | 2 | 0 | 2 |
| HAA | 0 | 2 | 2 |
| HNA | 1 | 0 | 1 |
• Jefferson County population
24 mi, 
180°
• Clinton County
27.4 mi, 
263°
• Effingham County
32.8 mi, 
32°
• Fayette County
24.9 mi, 
347°
• Bond County
32.3 mi, 
300°
• Wayne County
30.3 mi, 
119°
• Richland County
45.2 mi, 
84°
• Washington County
33.7 mi, 
232°
• Clay County
24.6 mi, 
73°
• Hamilton County
44 mi, 
152°
[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
*Jefferson, Crawford Illinois Notes
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