Last official estimated population of Gem County was 16,681 (year 2014)[1]. This was 0.005% of total US population and 1% of total Idaho state population. Area of Gem County is 565.7 mi² (=1465.2 km²), in this year population density was 29.49 p/mi². If population growth rate would be same as in period 2010-2014 (-0.06%/yr), Gem County population in 2025 would be 16,577 [0].
Historical population of Gem 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] +1.45 %/yr
[1930-1940] +2.55 %/yr
[1940-1950] -0.89 %/yr
[1950-1960] +0.45 %/yr
[1960-1970] +0.28 %/yr
[1970-1980] +2.46 %/yr
[1980-1990] -0.11 %/yr
[1990-2000] +2.51 %/yr
[2000-2005] +1.44 %/yr
[2005-2010] +0.5 %/yr
[2010-2014] -0.06 %/yr
Looking for settlements in Gem County? Visit this page: Settlements in Gem County, ID
Population of Gem County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 471 | 487 | 958 |
| 5 to 9 | 593 | 514 | 1,107 |
| 10 to 14 | 617 | 578 | 1,195 |
| 15 to 19 | 563 | 512 | 1,075 |
| 20 to 24 | 466 | 412 | 878 |
| 25 to 29 | 384 | 386 | 770 |
| 30 to 34 | 412 | 427 | 839 |
| 35 to 39 | 390 | 416 | 806 |
| 40 to 44 | 419 | 438 | 857 |
| 45 to 49 | 502 | 562 | 1,064 |
| 50 to 54 | 613 | 645 | 1,258 |
| 55 to 59 | 635 | 653 | 1,288 |
| 60 to 64 | 576 | 593 | 1,169 |
| 65 to 69 | 553 | 572 | 1,125 |
| 70 to 74 | 477 | 479 | 956 |
| 75 to 79 | 342 | 321 | 663 |
| 80 to 84 | 193 | 239 | 432 |
| 85+ | 179 | 247 | 426 |
Gem 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 | 8165 | 8238 | 16,403 |
| WA | 7973 | 8046 | 16,019 |
| NH | 7658 | 7819 | 15,477 |
| NHWAC | 7480 | 7614 | 15,094 |
| NHWA | 7317 | 7456 | 14,773 |
| H | 727 | 662 | 1,389 |
| HWAC | 685 | 624 | 1,309 |
| HWA | 656 | 590 | 1,246 |
| IAC | 210 | 197 | 407 |
| TOM | 199 | 199 | 398 |
| NHTOM | 169 | 161 | 330 |
| AAC | 139 | 184 | 323 |
| NHIAC | 158 | 146 | 304 |
| NHAAC | 129 | 174 | 303 |
| AA | 95 | 140 | 235 |
| NHAA | 90 | 135 | 225 |
| IA | 82 | 76 | 158 |
| HIAC | 52 | 51 | 103 |
| NHIA | 52 | 50 | 102 |
| BAC | 51 | 45 | 96 |
| NHBAC | 45 | 33 | 78 |
| HTOM | 30 | 38 | 68 |
| HIA | 30 | 26 | 56 |
| NAC | 27 | 21 | 48 |
| NHNAC | 23 | 17 | 40 |
| BA | 24 | 13 | 37 |
| NHBA | 21 | 12 | 33 |
| HAAC | 10 | 10 | 20 |
| NA | 12 | 7 | 19 |
| HBAC | 6 | 12 | 18 |
| NHNA | 9 | 5 | 14 |
| HAA | 5 | 5 | 10 |
| HNAC | 4 | 4 | 8 |
| HNA | 3 | 2 | 5 |
| HBA | 3 | 1 | 4 |
• Ada County population
42.8 mi, 
169°
• Canyon County
34 mi, 
207°
• Malheur County
85.3 mi, 
224°
• Elmore County
65.3 mi, 
134°
• Payette County
17.9 mi, 
256°
• Baker County
77.7 mi, 
304°
• Washington County
33.2 mi, 
323°
• Valley County
61.8 mi, 
37°
• Boise County
34.3 mi, 
98°
• Adams County
56.4 mi, 
356°
[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
*Canyon, Boise Idaho Notes
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