Last official estimated population of Jefferson County was 26,226 (year 2014)[1]. This was 0.008% of total US population and 1.6% of total Idaho state population. Area of Jefferson County is 1,105.6 mi² (=2863.4 km²), in this year population density was 23.72 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Jefferson County population in 2026 would be 26,486 [0].
Historical population of Jefferson 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] -0.29 %/yr
[1930-1940] +1.61 %/yr
[1940-1950] -0.25 %/yr
[1950-1960] +1.07 %/yr
[1960-1970] -0.05 %/yr
[1970-1980] +2.79 %/yr
[1980-1990] +0.78 %/yr
[1990-2000] +1.46 %/yr
[2000-2005] +2.54 %/yr
[2005-2010] +3.82 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, ID
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1235 | 1148 | 2,383 |
| 5 to 9 | 1411 | 1440 | 2,851 |
| 10 to 14 | 1325 | 1332 | 2,657 |
| 15 to 19 | 1136 | 1043 | 2,179 |
| 20 to 24 | 749 | 741 | 1,490 |
| 25 to 29 | 786 | 766 | 1,552 |
| 30 to 34 | 872 | 950 | 1,822 |
| 35 to 39 | 963 | 859 | 1,822 |
| 40 to 44 | 736 | 749 | 1,485 |
| 45 to 49 | 700 | 674 | 1,374 |
| 50 to 54 | 804 | 809 | 1,613 |
| 55 to 59 | 804 | 754 | 1,558 |
| 60 to 64 | 619 | 614 | 1,233 |
| 65 to 69 | 525 | 521 | 1,046 |
| 70 to 74 | 378 | 368 | 746 |
| 75 to 79 | 258 | 266 | 524 |
| 80 to 84 | 155 | 211 | 366 |
| 85+ | 136 | 184 | 320 |
Jefferson 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 | 13235 | 13090 | 26,325 |
| WA | 13040 | 12900 | 25,940 |
| NH | 12095 | 12154 | 24,249 |
| NHWAC | 11875 | 11951 | 23,826 |
| NHWA | 11742 | 11822 | 23,564 |
| H | 1497 | 1275 | 2,772 |
| HWAC | 1360 | 1139 | 2,499 |
| HWA | 1298 | 1078 | 2,376 |
| IAC | 286 | 288 | 574 |
| TOM | 211 | 211 | 422 |
| IA | 179 | 172 | 351 |
| NHIAC | 155 | 144 | 299 |
| AAC | 147 | 136 | 283 |
| NHTOM | 141 | 137 | 278 |
| HIAC | 131 | 144 | 275 |
| NHAAC | 118 | 116 | 234 |
| BAC | 110 | 88 | 198 |
| HIA | 91 | 95 | 186 |
| NHIA | 88 | 77 | 165 |
| AA | 74 | 74 | 148 |
| HTOM | 70 | 74 | 144 |
| NHAA | 65 | 69 | 134 |
| NHBAC | 69 | 53 | 122 |
| BA | 68 | 50 | 118 |
| NAC | 40 | 50 | 90 |
| HBAC | 41 | 35 | 76 |
| NHBA | 43 | 31 | 74 |
| NHNAC | 30 | 35 | 65 |
| HAAC | 29 | 20 | 49 |
| HBA | 25 | 19 | 44 |
| NA | 20 | 22 | 42 |
| NHNA | 16 | 18 | 34 |
| HNAC | 10 | 15 | 25 |
| HAA | 9 | 5 | 14 |
| HNA | 4 | 4 | 8 |
• Bonneville County population
44.6 mi, 
128°
• Bannock County
76.4 mi, 
176°
• Bingham County
40.3 mi, 
185°
• Madison County
33 mi, 
91°
• Fremont County
50.6 mi, 
54°
• Teton County
55.3 mi, 92°
• Power County
80.7 mi, 
199°
• Caribou County
80 mi, 
150°
• Butte County
43.6 mi, 
259°
• Clark County
34.1 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
*Fremont Idaho Notes
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