Last official estimated population of Franklin County was 12,777 (year 2014)[1]. This was 0.004% of total US population and 0.8% of total Idaho state population. Area of Franklin County is 668.3 mi² (=1730.9 km²), in this year population density was 19.12 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Franklin County population in 2026 would be 12,750 [0].
Historical population of Franklin 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] +0.81 %/yr
[1930-1940] +0.87 %/yr
[1940-1950] -0.36 %/yr
[1950-1960] -1.53 %/yr
[1960-1970] -1.36 %/yr
[1970-1980] +1.89 %/yr
[1980-1990] +0.37 %/yr
[1990-2000] +2.07 %/yr
[2000-2005] +1.28 %/yr
[2005-2010] +1.14 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Franklin County? Visit this page: Settlements in Franklin County, ID
Population of Franklin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 482 | 561 | 1,043 |
| 5 to 9 | 676 | 585 | 1,261 |
| 10 to 14 | 724 | 606 | 1,330 |
| 15 to 19 | 579 | 551 | 1,130 |
| 20 to 24 | 378 | 324 | 702 |
| 25 to 29 | 294 | 313 | 607 |
| 30 to 34 | 379 | 379 | 758 |
| 35 to 39 | 443 | 446 | 889 |
| 40 to 44 | 381 | 359 | 740 |
| 45 to 49 | 322 | 315 | 637 |
| 50 to 54 | 366 | 386 | 752 |
| 55 to 59 | 390 | 356 | 746 |
| 60 to 64 | 336 | 318 | 654 |
| 65 to 69 | 261 | 266 | 527 |
| 70 to 74 | 208 | 248 | 456 |
| 75 to 79 | 177 | 155 | 332 |
| 80 to 84 | 103 | 119 | 222 |
| 85+ | 100 | 135 | 235 |
Franklin 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 | 6516 | 6325 | 12,841 |
| WA | 6431 | 6223 | 12,654 |
| NH | 6116 | 6003 | 12,119 |
| NHWAC | 6067 | 5941 | 12,008 |
| NHWA | 6008 | 5856 | 11,864 |
| H | 483 | 419 | 902 |
| HWAC | 449 | 384 | 833 |
| HWA | 423 | 367 | 790 |
| IAC | 105 | 129 | 234 |
| TOM | 89 | 105 | 194 |
| NHTOM | 63 | 87 | 150 |
| NHIAC | 54 | 83 | 137 |
| IA | 48 | 61 | 109 |
| HIAC | 51 | 46 | 97 |
| BAC | 37 | 34 | 71 |
| HIA | 33 | 33 | 66 |
| NHBAC | 33 | 30 | 63 |
| AAC | 23 | 31 | 54 |
| NHAAC | 19 | 28 | 47 |
| HTOM | 26 | 18 | 44 |
| NHIA | 15 | 28 | 43 |
| BA | 21 | 14 | 35 |
| NHBA | 20 | 14 | 34 |
| NAC | 10 | 12 | 22 |
| AA | 8 | 14 | 22 |
| NHAA | 8 | 13 | 21 |
| NHNAC | 9 | 11 | 20 |
| HBAC | 4 | 4 | 8 |
| HAAC | 4 | 3 | 7 |
| NA | 2 | 5 | 7 |
| NHNA | 2 | 5 | 7 |
| HNAC | 1 | 1 | 2 |
| HBA | 1 | 0 | 1 |
| HAA | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Weber County population
62.5 mi, 
182°
• Cache County
30.6 mi, 
172°
• Bannock County
41.4 mi, 
330°
• Box Elder County
73.4 mi, 
238°
• Lincoln County
58.5 mi, 
86°
• Power County
63.3 mi, 
304°
• Caribou County
44.6 mi, 
18°
• Bear Lake County
26.5 mi, 
72°
• Oneida County
35.7 mi, 
271°
• Rich County
48.2 mi, 
141°
[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
*Oneida, Bannock Idaho Notes
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