Last official estimated population of Madison County was 37,595 (year 2014)[1]. This was 0.012% of total US population and 2.3% of total Idaho state population. Area of Madison County is 473.2 mi² (=1225.7 km²), in this year population density was 79.44 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Madison County population in 2026 would be 37,773 [0].
Historical population of Madison County for period 1920-2014 [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
[1920-1930] -0.97 %/yr
[1930-1940] +1 %/yr
[1940-1950] -0.03 %/yr
[1950-1960] +0.28 %/yr
[1960-1970] +3.63 %/yr
[1970-1980] +3.77 %/yr
[1980-1990] +1.97 %/yr
[1990-2000] +1.51 %/yr
[2000-2005] +4.22 %/yr
[2005-2010] +2.11 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Madison County? Visit this page: Settlements in Madison County, ID
Population of Madison County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2040 | 1760 | 3,800 |
| 5 to 9 | 1338 | 1203 | 2,541 |
| 10 to 14 | 1247 | 1208 | 2,455 |
| 15 to 19 | 1621 | 2981 | 4,602 |
| 20 to 24 | 4600 | 3959 | 8,559 |
| 25 to 29 | 2420 | 1840 | 4,260 |
| 30 to 34 | 1040 | 865 | 1,905 |
| 35 to 39 | 776 | 751 | 1,527 |
| 40 to 44 | 655 | 694 | 1,349 |
| 45 to 49 | 566 | 586 | 1,152 |
| 50 to 54 | 621 | 652 | 1,273 |
| 55 to 59 | 619 | 676 | 1,295 |
| 60 to 64 | 533 | 503 | 1,036 |
| 65 to 69 | 352 | 388 | 740 |
| 70 to 74 | 270 | 294 | 564 |
| 75 to 79 | 210 | 247 | 457 |
| 80 to 84 | 128 | 153 | 281 |
| 85+ | 87 | 155 | 242 |
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 | 18578 | 18386 | 36,964 |
| WA | 18300 | 18051 | 36,351 |
| NH | 17805 | 17579 | 35,384 |
| NHWAC | 17352 | 17132 | 34,484 |
| NHWA | 17137 | 16853 | 33,990 |
| H | 1318 | 1336 | 2,654 |
| HWAC | 1226 | 1254 | 2,480 |
| HWA | 1163 | 1198 | 2,361 |
| AAC | 330 | 395 | 725 |
| TOM | 311 | 360 | 671 |
| NHAAC | 296 | 362 | 658 |
| NHTOM | 235 | 298 | 533 |
| IAC | 206 | 254 | 460 |
| AA | 191 | 236 | 427 |
| NHAA | 183 | 219 | 402 |
| BAC | 195 | 178 | 373 |
| NHBAC | 157 | 155 | 312 |
| NHIAC | 124 | 172 | 296 |
| BA | 131 | 127 | 258 |
| NAC | 146 | 98 | 244 |
| NHBA | 111 | 112 | 223 |
| NHNAC | 128 | 88 | 216 |
| IA | 92 | 103 | 195 |
| HIAC | 82 | 82 | 164 |
| HTOM | 76 | 62 | 138 |
| NA | 98 | 38 | 136 |
| NHNA | 89 | 36 | 125 |
| NHIA | 50 | 61 | 111 |
| HIA | 42 | 42 | 84 |
| HAAC | 34 | 33 | 67 |
| HBAC | 38 | 23 | 61 |
| HBA | 20 | 15 | 35 |
| HNAC | 18 | 10 | 28 |
| HAA | 8 | 17 | 25 |
| HNA | 9 | 2 | 11 |
• Bonneville County population
27.2 mi, 
176°
• Bannock County
81 mi, 
200°
• Bingham County
54.3 mi, 
223°
• Jefferson County
33 mi, 
271°
• Teton County
63.8 mi, 
73°
• Fremont County
30.9 mi, 
16°
• Teton County
22.3 mi, 
94°
• Caribou County
69.5 mi, 175°
• Butte County
76.2 mi, 
264°
• Clark County
49 mi, 
315°
[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
*Fremont Idaho Notes
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