Last official estimated population of Idaho County was 16,297 (year 2014)[1]. This was 0.005% of total US population and 1% of total Idaho state population. Area of Idaho County is 8,503.2 mi² (=22023.3 km²), in this year population density was 1.92 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Idaho County population in 2026 would be 16,387 [0].
Historical population of Idaho County for period 1870-2014 [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
[1870-1880] +9.11 %/yr
[1880-1890] +3.82 %/yr
[1890-1900] +11.93 %/yr
[1900-1910] +3.11 %/yr
[1910-1920] -0.52 %/yr
[1920-1930] -1.49 %/yr
[1930-1940] +2.3 %/yr
[1940-1950] -1.05 %/yr
[1950-1960] +1.72 %/yr
[1960-1970] -0.49 %/yr
[1970-1980] +1.37 %/yr
[1980-1990] -0.7 %/yr
[1990-2000] +1.2 %/yr
[2000-2005] +0.02 %/yr
[2005-2010] +0.94 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Idaho County? Visit this page: Settlements in Idaho County, ID
Population of Idaho County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 423 | 426 | 849 |
| 5 to 9 | 461 | 409 | 870 |
| 10 to 14 | 478 | 438 | 916 |
| 15 to 19 | 533 | 423 | 956 |
| 20 to 24 | 471 | 308 | 779 |
| 25 to 29 | 362 | 308 | 670 |
| 30 to 34 | 439 | 346 | 785 |
| 35 to 39 | 394 | 338 | 732 |
| 40 to 44 | 391 | 384 | 775 |
| 45 to 49 | 473 | 436 | 909 |
| 50 to 54 | 548 | 613 | 1,161 |
| 55 to 59 | 715 | 714 | 1,429 |
| 60 to 64 | 773 | 713 | 1,486 |
| 65 to 69 | 691 | 616 | 1,307 |
| 70 to 74 | 544 | 473 | 1,017 |
| 75 to 79 | 374 | 311 | 685 |
| 80 to 84 | 218 | 251 | 469 |
| 85+ | 177 | 243 | 420 |
Idaho 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 | 8184 | 7525 | 15,709 |
| WAC | 8130 | 7441 | 15,571 |
| WA | 7940 | 7303 | 15,243 |
| NHWAC | 7891 | 7241 | 15,132 |
| NHWA | 7719 | 7119 | 14,838 |
| IAC | 391 | 330 | 721 |
| NHIAC | 343 | 298 | 641 |
| H | 281 | 225 | 506 |
| IA | 252 | 234 | 486 |
| HWAC | 239 | 200 | 439 |
| NHIA | 215 | 215 | 430 |
| HWA | 221 | 184 | 405 |
| TOM | 194 | 141 | 335 |
| NHTOM | 176 | 124 | 300 |
| AAC | 55 | 70 | 125 |
| NHAAC | 49 | 67 | 116 |
| BAC | 67 | 46 | 113 |
| NHBAC | 62 | 39 | 101 |
| HIAC | 48 | 32 | 80 |
| AA | 31 | 49 | 80 |
| NHAA | 28 | 47 | 75 |
| BA | 38 | 23 | 61 |
| NHBA | 37 | 20 | 57 |
| HIA | 37 | 19 | 56 |
| HTOM | 18 | 17 | 35 |
| NAC | 22 | 9 | 31 |
| NHNAC | 20 | 8 | 28 |
| HBAC | 5 | 7 | 12 |
| NA | 10 | 0 | 10 |
| NHNA | 9 | 0 | 9 |
| HAAC | 6 | 3 | 9 |
| HAA | 3 | 2 | 5 |
| HBA | 1 | 3 | 4 |
| HNAC | 2 | 1 | 3 |
| HNA | 1 | 0 | 1 |
• Ravalli County population
66.7 mi, 
76°
• Nez Perce County
70.4 mi, 
298°
• Latah County
90.1 mi, 
318°
• Asotin County
87.5 mi, 
285°
• Valley County
74.9 mi, 
186°
• Clearwater County
57.5 mi, 
351°
• Wallowa County
84.7 mi, 
257°
• Mineral County
92.2 mi, 
11°
• Adams County
82.7 mi, 
215°
• Lewis County
53.1 mi, 300°
[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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