Last official estimated population of Madison County was 269,341 (year 2014)[1]. This was 0.084% of total US population and 2.1% of total Illinois state population. Area of Madison County is 740.6 mi² (=1918 km²), in this year population density was 363.70 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Madison County population in 2026 would be 269,518 [0].
Historical population of Madison County for period 1820-2014 [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
[1820-1830] -7.49 %/yr
[1830-1840] +8.78 %/yr
[1840-1850] +3.54 %/yr
[1850-1860] +4.34 %/yr
[1860-1870] +3.51 %/yr
[1870-1880] +1.28 %/yr
[1880-1890] +0.28 %/yr
[1890-1900] +2.3 %/yr
[1900-1910] +3.34 %/yr
[1910-1920] +1.75 %/yr
[1920-1930] +3.01 %/yr
[1930-1940] +0.38 %/yr
[1940-1950] +2.01 %/yr
[1950-1960] +2.11 %/yr
[1960-1970] +1.11 %/yr
[1970-1980] -0.13 %/yr
[1980-1990] +0.06 %/yr
[1990-2000] +0.39 %/yr
[2000-2005] +0.44 %/yr
[2005-2010] +0.34 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Madison County? Visit this page: Settlements in Madison County, IL
Population of Madison County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 8067 | 7636 | 15,703 |
| 5 to 9 | 8434 | 8030 | 16,464 |
| 10 to 14 | 8856 | 8145 | 17,001 |
| 15 to 19 | 8438 | 7818 | 16,256 |
| 20 to 24 | 8630 | 8909 | 17,539 |
| 25 to 29 | 9287 | 9188 | 18,475 |
| 30 to 34 | 8446 | 8661 | 17,107 |
| 35 to 39 | 7741 | 8150 | 15,891 |
| 40 to 44 | 8174 | 8586 | 16,760 |
| 45 to 49 | 8595 | 8707 | 17,302 |
| 50 to 54 | 9901 | 10004 | 19,905 |
| 55 to 59 | 9851 | 10096 | 19,947 |
| 60 to 64 | 7842 | 8596 | 16,438 |
| 65 to 69 | 6135 | 6924 | 13,059 |
| 70 to 74 | 4476 | 5336 | 9,812 |
| 75 to 79 | 3199 | 4067 | 7,266 |
| 80 to 84 | 2241 | 3354 | 5,595 |
| 85+ | 1934 | 4106 | 6,040 |
Madison 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 | 125923 | 132398 | 258,321 |
| WAC | 118143 | 122409 | 240,552 |
| WA | 115762 | 120036 | 235,798 |
| NHWAC | 114192 | 118814 | 233,006 |
| NHWA | 111989 | 116579 | 228,568 |
| BAC | 11840 | 13403 | 25,243 |
| NHBAC | 11580 | 13189 | 24,769 |
| BA | 10343 | 11906 | 22,249 |
| NHBA | 10183 | 11771 | 21,954 |
| H | 4324 | 3915 | 8,239 |
| HWAC | 3951 | 3595 | 7,546 |
| HWA | 3773 | 3457 | 7,230 |
| TOM | 2515 | 2507 | 5,022 |
| NHTOM | 2324 | 2357 | 4,681 |
| AAC | 1749 | 2013 | 3,762 |
| NHAAC | 1680 | 1937 | 3,617 |
| AA | 1124 | 1405 | 2,529 |
| NHAA | 1080 | 1349 | 2,429 |
| IAC | 1049 | 1024 | 2,073 |
| NHIAC | 814 | 847 | 1,661 |
| IA | 419 | 394 | 813 |
| NHIA | 284 | 286 | 570 |
| HBAC | 260 | 214 | 474 |
| HIAC | 235 | 177 | 412 |
| HTOM | 191 | 150 | 341 |
| NAC | 159 | 158 | 317 |
| HBA | 160 | 135 | 295 |
| NHNAC | 128 | 139 | 267 |
| HIA | 135 | 108 | 243 |
| NA | 84 | 65 | 149 |
| HAAC | 69 | 76 | 145 |
| NHNA | 63 | 56 | 119 |
| HAA | 44 | 56 | 100 |
| HNAC | 31 | 19 | 50 |
| HNA | 21 | 9 | 30 |
• St. Louis County population
32.1 mi, 
246°
• St. Charles County
41.8 mi, 
265°
• St. Louis city
22.8 mi, 
234°
• St. Clair County
24.7 mi, 
183°
• Macoupin County
30.4 mi, 
357°
• Clinton County
29.8 mi, 
120°
• Monroe County
40.8 mi, 
201°
• Montgomery County
35.8 mi, 
39°
• Jersey County
30.3 mi, 
305°
• Bond County
25.3 mi, 
80°
[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
*St. Clair Illinois Notes
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