Last official estimated population of Cassia County was 23,078 (year 2014)[1]. This was 0.007% of total US population and 1.4% of total Idaho state population. Area of Cassia County is 2,579.8 mi² (=6681.8 km²), in this year population density was 8.95 p/mi². If population growth rate would be same as in period 2010-2014 (+0.14%/yr), Cassia County population in 2024 would be 23,396 [0].
Historical population of Cassia County for period 1880-2014 [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
[1880-1890] +9.13 %/yr
[1890-1900] +2.31 %/yr
[1900-1910] +6.18 %/yr
[1910-1920] +8.08 %/yr
[1920-1930] -1.76 %/yr
[1930-1940] +0.96 %/yr
[1940-1950] +0.14 %/yr
[1950-1960] +0.98 %/yr
[1960-1970] +0.54 %/yr
[1970-1980] +1.33 %/yr
[1980-1990] +0.05 %/yr
[1990-2000] +0.92 %/yr
[2000-2005] -0.03 %/yr
[2005-2010] +1.44 %/yr
[2010-2014] +0.14 %/yr
Looking for settlements in Cassia County? Visit this page: Settlements in Cassia County, ID
Population of Cassia County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 962 | 985 | 1,947 |
| 5 to 9 | 1141 | 1103 | 2,244 |
| 10 to 14 | 1161 | 1052 | 2,213 |
| 15 to 19 | 946 | 865 | 1,811 |
| 20 to 24 | 815 | 690 | 1,505 |
| 25 to 29 | 678 | 656 | 1,334 |
| 30 to 34 | 747 | 750 | 1,497 |
| 35 to 39 | 721 | 661 | 1,382 |
| 40 to 44 | 657 | 635 | 1,292 |
| 45 to 49 | 607 | 577 | 1,184 |
| 50 to 54 | 714 | 666 | 1,380 |
| 55 to 59 | 717 | 670 | 1,387 |
| 60 to 64 | 593 | 584 | 1,177 |
| 65 to 69 | 482 | 481 | 963 |
| 70 to 74 | 381 | 394 | 775 |
| 75 to 79 | 283 | 318 | 601 |
| 80 to 84 | 172 | 250 | 422 |
| 85+ | 154 | 272 | 426 |
Cassia 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 | 11569 | 11231 | 22,800 |
| WA | 11405 | 11034 | 22,439 |
| NH | 8620 | 8649 | 17,269 |
| NHWAC | 8475 | 8471 | 16,946 |
| NHWA | 8372 | 8341 | 16,713 |
| H | 3311 | 2960 | 6,271 |
| HWAC | 3094 | 2760 | 5,854 |
| HWA | 3033 | 2693 | 5,726 |
| IAC | 295 | 304 | 599 |
| TOM | 172 | 207 | 379 |
| IA | 191 | 182 | 373 |
| HIAC | 173 | 171 | 344 |
| AAC | 126 | 146 | 272 |
| NHIAC | 122 | 133 | 255 |
| HIA | 127 | 121 | 248 |
| NHTOM | 106 | 137 | 243 |
| BAC | 97 | 116 | 213 |
| NHAAC | 86 | 113 | 199 |
| AA | 73 | 95 | 168 |
| BA | 69 | 77 | 146 |
| HTOM | 66 | 70 | 136 |
| NHIA | 64 | 61 | 125 |
| NHAA | 49 | 75 | 124 |
| HBAC | 55 | 62 | 117 |
| HBA | 46 | 50 | 96 |
| NHBAC | 42 | 54 | 96 |
| HAAC | 40 | 33 | 73 |
| NAC | 39 | 31 | 70 |
| NHBA | 23 | 27 | 50 |
| HAA | 24 | 20 | 44 |
| NHNAC | 16 | 23 | 39 |
| NA | 21 | 14 | 35 |
| HNAC | 23 | 8 | 31 |
| HNA | 15 | 6 | 21 |
| NHNA | 6 | 8 | 14 |
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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
*Owyhee Idaho Notes
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