Last official estimated population of Madison County was 15,722 (year 2014)[1]. This was 0.005% of total US population and 0.5% of total Iowa state population. Area of Madison County is 562.2 mi² (=1456 km²), in this year population density was 27.97 p/mi². If population growth rate would be same as in period 2010-2014 (+0.07%/yr), Madison County population in 2026 would be 15,852 [0].
Historical population of Madison 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] +20.06 %/yr
[1860-1870] +6.58 %/yr
[1870-1880] +2.18 %/yr
[1880-1890] -0.75 %/yr
[1890-1900] +1.04 %/yr
[1900-1910] -1.25 %/yr
[1910-1920] -0.39 %/yr
[1920-1930] -0.47 %/yr
[1930-1940] +0.13 %/yr
[1940-1950] -1 %/yr
[1950-1960] -0.66 %/yr
[1960-1970] -0.62 %/yr
[1970-1980] +0.86 %/yr
[1980-1990] -0.09 %/yr
[1990-2000] +1.16 %/yr
[2000-2005] +1.26 %/yr
[2005-2010] +1 %/yr
[2010-2014] +0.07 %/yr
Looking for settlements in Madison County? Visit this page: Settlements in Madison County, IA
Population of Madison County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 466 | 446 | 912 |
| 5 to 9 | 621 | 542 | 1,163 |
| 10 to 14 | 611 | 587 | 1,198 |
| 15 to 19 | 581 | 535 | 1,116 |
| 20 to 24 | 356 | 316 | 672 |
| 25 to 29 | 328 | 360 | 688 |
| 30 to 34 | 437 | 430 | 867 |
| 35 to 39 | 480 | 493 | 973 |
| 40 to 44 | 540 | 546 | 1,086 |
| 45 to 49 | 542 | 548 | 1,090 |
| 50 to 54 | 582 | 581 | 1,163 |
| 55 to 59 | 562 | 572 | 1,134 |
| 60 to 64 | 517 | 493 | 1,010 |
| 65 to 69 | 396 | 392 | 788 |
| 70 to 74 | 284 | 316 | 600 |
| 75 to 79 | 211 | 227 | 438 |
| 80 to 84 | 141 | 192 | 333 |
| 85+ | 122 | 256 | 378 |
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 |
| WAC | 7670 | 7718 | 15,388 |
| NH | 7661 | 7711 | 15,372 |
| WA | 7585 | 7657 | 15,242 |
| NHWAC | 7571 | 7607 | 15,178 |
| NHWA | 7492 | 7550 | 15,042 |
| H | 116 | 121 | 237 |
| HWAC | 99 | 111 | 210 |
| HWA | 93 | 107 | 200 |
| TOM | 90 | 65 | 155 |
| NHTOM | 84 | 61 | 145 |
| BAC | 83 | 52 | 135 |
| AAC | 60 | 63 | 123 |
| NHAAC | 58 | 63 | 121 |
| NHBAC | 72 | 44 | 116 |
| IAC | 53 | 61 | 114 |
| NHIAC | 44 | 55 | 99 |
| BA | 45 | 32 | 77 |
| AA | 30 | 46 | 76 |
| NHAA | 29 | 46 | 75 |
| NHBA | 36 | 27 | 63 |
| IA | 27 | 31 | 58 |
| NHIA | 20 | 26 | 46 |
| HBAC | 11 | 8 | 19 |
| HIAC | 9 | 6 | 15 |
| HBA | 9 | 5 | 14 |
| HIA | 7 | 5 | 12 |
| HTOM | 6 | 4 | 10 |
| NAC | 3 | 4 | 7 |
| NHNAC | 2 | 4 | 6 |
| HAAC | 2 | 0 | 2 |
| HNAC | 1 | 0 | 1 |
| HAA | 1 | 0 | 1 |
| NA | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Polk County population
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24.5 mi, 
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23.4 mi, 
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• Union County
24.1 mi, 
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35 mi, 
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• Clarke County
24 mi, 
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• Lucas County
41.1 mi, 
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• Decatur County
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• Adair County
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• Adams County
41.4 mi, 
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[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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