Last official estimated population of Blaine County was 21,295 (year 2014)[1]. This was 0.007% of total US population and 1.3% of total Idaho state population. Area of Blaine County is 2,657.0 mi² (=6881.7 km²), in this year population density was 8.01 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Blaine County population in 2026 would be 21,054 [0].
Historical population of Blaine County for period 1900-2014 [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

[1900-1910] +5.52 %/yr
[1910-1920] -6.09 %/yr
[1920-1930] -1.7 %/yr
[1930-1940] +3.46 %/yr
[1940-1950] +0.17 %/yr
[1950-1960] -1.57 %/yr
[1960-1970] +2.26 %/yr
[1970-1980] +5.52 %/yr
[1980-1990] +3.25 %/yr
[1990-2000] +3.43 %/yr
[2000-2005] +1.93 %/yr
[2005-2010] +0.45 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Blaine County? Visit this page: Settlements in Blaine County, ID
Population of Blaine County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 591 | 536 | 1,127 |
| 5 to 9 | 786 | 691 | 1,477 |
| 10 to 14 | 765 | 779 | 1,544 |
| 15 to 19 | 623 | 612 | 1,235 |
| 20 to 24 | 549 | 478 | 1,027 |
| 25 to 29 | 534 | 546 | 1,080 |
| 30 to 34 | 666 | 630 | 1,296 |
| 35 to 39 | 751 | 630 | 1,381 |
| 40 to 44 | 716 | 714 | 1,430 |
| 45 to 49 | 746 | 706 | 1,452 |
| 50 to 54 | 807 | 862 | 1,669 |
| 55 to 59 | 838 | 865 | 1,703 |
| 60 to 64 | 824 | 839 | 1,663 |
| 65 to 69 | 663 | 668 | 1,331 |
| 70 to 74 | 484 | 469 | 953 |
| 75 to 79 | 295 | 228 | 523 |
| 80 to 84 | 163 | 151 | 314 |
| 85+ | 112 | 165 | 277 |
Blaine 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 | 10557 | 10249 | 20,806 |
| WA | 10412 | 10109 | 20,521 |
| NH | 8566 | 8474 | 17,040 |
| NHWAC | 8392 | 8309 | 16,701 |
| NHWA | 8302 | 8214 | 16,516 |
| H | 2347 | 2095 | 4,442 |
| HWAC | 2165 | 1940 | 4,105 |
| HWA | 2110 | 1895 | 4,005 |
| IAC | 244 | 210 | 454 |
| HIAC | 181 | 146 | 327 |
| IA | 170 | 152 | 322 |
| AAC | 138 | 163 | 301 |
| TOM | 150 | 142 | 292 |
| HIA | 145 | 124 | 269 |
| NHAAC | 121 | 143 | 264 |
| AA | 99 | 125 | 224 |
| NHAA | 90 | 116 | 206 |
| NHTOM | 92 | 97 | 189 |
| BAC | 76 | 75 | 151 |
| NHIAC | 63 | 64 | 127 |
| HTOM | 58 | 45 | 103 |
| NHBAC | 40 | 46 | 86 |
| NAC | 55 | 26 | 81 |
| BA | 42 | 30 | 72 |
| HBAC | 36 | 29 | 65 |
| NHNAC | 46 | 17 | 63 |
| NHIA | 25 | 28 | 53 |
| NA | 40 | 11 | 51 |
| NHNA | 35 | 6 | 41 |
| HBA | 20 | 17 | 37 |
| HAAC | 17 | 20 | 37 |
| NHBA | 22 | 13 | 35 |
| HNAC | 9 | 9 | 18 |
| HAA | 9 | 9 | 18 |
| HNA | 5 | 5 | 10 |
• Elmore County population
76.1 mi,
270°
• Cassia County
78.6 mi,
167°
• Jerome County
51 mi,
197°
• Minidoka County
40.4 mi,
156°
• Gooding County
52.4 mi,
236°
• Power County
74.1 mi,
130°
• Lincoln County
29.9 mi,
199°
• Custer County
62.5 mi,
346°
• Butte County
43.8 mi,
62°
• Camas County
42.9 mi,
276°
[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
*Alturas, Logan; Lemhi Idaho Notes
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