Last official estimated population of Fremont County was 13,237 (year 2014)[1]. This was 0.004% of total US population and 0.8% of total Idaho state population. Area of Fremont County is 1,895.9 mi² (=4910.4 km²), in this year population density was 6.98 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Fremont County population in 2026 would be 13,222 [0].
Historical population of Fremont 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] +6.74 %/yr
[1910-1920] -8.27 %/yr
[1920-1930] -0.45 %/yr
[1930-1940] +0.38 %/yr
[1940-1950] -0.97 %/yr
[1950-1960] -0.74 %/yr
[1960-1970] +0.04 %/yr
[1970-1980] +2.19 %/yr
[1980-1990] +0.11 %/yr
[1990-2000] +0.77 %/yr
[2000-2005] +1.31 %/yr
[2005-2010] +0.98 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Fremont County? Visit this page: Settlements in Fremont County, ID
Population of Fremont County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 453 | 433 | 886 |
| 5 to 9 | 508 | 489 | 997 |
| 10 to 14 | 558 | 508 | 1,066 |
| 15 to 19 | 613 | 470 | 1,083 |
| 20 to 24 | 369 | 316 | 685 |
| 25 to 29 | 341 | 327 | 668 |
| 30 to 34 | 384 | 363 | 747 |
| 35 to 39 | 458 | 384 | 842 |
| 40 to 44 | 347 | 348 | 695 |
| 45 to 49 | 387 | 336 | 723 |
| 50 to 54 | 443 | 373 | 816 |
| 55 to 59 | 434 | 402 | 836 |
| 60 to 64 | 404 | 361 | 765 |
| 65 to 69 | 316 | 333 | 649 |
| 70 to 74 | 289 | 271 | 560 |
| 75 to 79 | 200 | 162 | 362 |
| 80 to 84 | 134 | 152 | 286 |
| 85+ | 85 | 116 | 201 |
Fremont 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 | 6554 | 5999 | 12,553 |
| WA | 6453 | 5925 | 12,378 |
| NH | 5872 | 5402 | 11,274 |
| NHWAC | 5773 | 5313 | 11,086 |
| NHWA | 5703 | 5263 | 10,966 |
| H | 851 | 742 | 1,593 |
| HWAC | 781 | 686 | 1,467 |
| HWA | 750 | 662 | 1,412 |
| IAC | 127 | 116 | 243 |
| TOM | 105 | 77 | 182 |
| NHIAC | 86 | 79 | 165 |
| BAC | 92 | 55 | 147 |
| IA | 66 | 71 | 137 |
| NHTOM | 73 | 53 | 126 |
| BA | 69 | 39 | 108 |
| NHIA | 45 | 49 | 94 |
| HBAC | 48 | 33 | 81 |
| HIAC | 41 | 37 | 78 |
| AAC | 36 | 38 | 74 |
| HBA | 42 | 27 | 69 |
| NHBAC | 44 | 22 | 66 |
| NHAAC | 27 | 35 | 62 |
| HTOM | 32 | 24 | 56 |
| AA | 20 | 24 | 44 |
| HIA | 21 | 22 | 43 |
| NAC | 26 | 14 | 40 |
| NHBA | 27 | 12 | 39 |
| NHAA | 16 | 22 | 38 |
| NHNAC | 20 | 7 | 27 |
| NA | 10 | 8 | 18 |
| HNAC | 6 | 7 | 13 |
| HAAC | 9 | 3 | 12 |
| NHNA | 8 | 3 | 11 |
| HNA | 2 | 5 | 7 |
| HAA | 4 | 2 | 6 |
• Bonneville County population
57.3 mi,
186°
• Gallatin County
91.2 mi,
9°
• Bingham County
82.9 mi,
213°
• Madison County
30.9 mi,
196°
• Jefferson County
50.6 mi,
234°
• Teton County
53.8 mi,
102°
• Teton County
34.4 mi,
156°
• Madison County
79.3 mi,
344°
• Butte County
91.9 mi,
246°
• Clark County
43.3 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
*Bingham; Lemhi Idaho Notes
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