Last official estimated population of Jerome County was 22,449 (year 2014)[1]. This was 0.007% of total US population and 1.4% of total Idaho state population. Area of Jerome County is 602.2 mi² (=1559.6 km²), in this year population density was 37.28 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Jerome County population in 2025 would be 22,657 [0].
Historical population of Jerome 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] +3.85 %/yr
[1930-1940] +1.71 %/yr
[1940-1950] +2.01 %/yr
[1950-1960] -0.31 %/yr
[1960-1970] -1.32 %/yr
[1970-1980] +3.77 %/yr
[1980-1990] +0.2 %/yr
[1990-2000] +1.97 %/yr
[2000-2005] +1.33 %/yr
[2005-2010] +2.63 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Jerome County? Visit this page: Settlements in Jerome County, ID
Population of Jerome County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1065 | 1038 | 2,103 |
| 5 to 9 | 1088 | 1022 | 2,110 |
| 10 to 14 | 904 | 944 | 1,848 |
| 15 to 19 | 806 | 728 | 1,534 |
| 20 to 24 | 810 | 722 | 1,532 |
| 25 to 29 | 783 | 756 | 1,539 |
| 30 to 34 | 844 | 746 | 1,590 |
| 35 to 39 | 667 | 643 | 1,310 |
| 40 to 44 | 628 | 619 | 1,247 |
| 45 to 49 | 648 | 635 | 1,283 |
| 50 to 54 | 749 | 656 | 1,405 |
| 55 to 59 | 674 | 682 | 1,356 |
| 60 to 64 | 613 | 596 | 1,209 |
| 65 to 69 | 434 | 467 | 901 |
| 70 to 74 | 361 | 358 | 719 |
| 75 to 79 | 240 | 255 | 495 |
| 80 to 84 | 166 | 199 | 365 |
| 85+ | 90 | 182 | 272 |
Jerome 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 | 11142 | 10819 | 21,961 |
| WA | 11002 | 10625 | 21,627 |
| NH | 7451 | 7617 | 15,068 |
| NHWAC | 7291 | 7434 | 14,725 |
| NHWA | 7182 | 7287 | 14,469 |
| H | 4119 | 3631 | 7,750 |
| HWAC | 3851 | 3385 | 7,236 |
| HWA | 3820 | 3338 | 7,158 |
| IAC | 359 | 391 | 750 |
| IA | 274 | 271 | 545 |
| HIAC | 224 | 215 | 439 |
| HIA | 204 | 182 | 386 |
| TOM | 146 | 203 | 349 |
| NHIAC | 135 | 176 | 311 |
| NHTOM | 113 | 153 | 266 |
| BAC | 113 | 92 | 205 |
| AAC | 80 | 113 | 193 |
| NHIA | 70 | 89 | 159 |
| NHAAC | 60 | 91 | 151 |
| BA | 84 | 52 | 136 |
| AA | 46 | 76 | 122 |
| NHBAC | 66 | 49 | 115 |
| NHAA | 34 | 59 | 93 |
| HBAC | 47 | 43 | 90 |
| HTOM | 33 | 50 | 83 |
| HBA | 40 | 31 | 71 |
| NAC | 30 | 39 | 69 |
| NHBA | 44 | 21 | 65 |
| HAAC | 20 | 22 | 42 |
| NA | 18 | 21 | 39 |
| NHNAC | 16 | 23 | 39 |
| HNAC | 14 | 16 | 30 |
| HAA | 12 | 17 | 29 |
| HNA | 10 | 13 | 23 |
| NHNA | 8 | 8 | 16 |
• Twin Falls County population
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59.9 mi, 
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[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
*Lincoln Idaho Notes
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