Last official estimated population of Twin Falls County was 77,527 (year 2014)[1]. This was 0.024% of total US population and 4.7% of total Idaho state population. Area of Twin Falls County is 1,928.3 mi² (=4994.3 km²), in this year population density was 40.20 p/mi². If population growth rate would be same as in period 2010-2014 (+0.1%/yr), Twin Falls County population in 2026 would be 78,425 [0].
Historical population of Twin Falls County for period 1910-2014 [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

[1910-1920] +7.69 %/yr
[1920-1930] +0.49 %/yr
[1930-1940] +2.01 %/yr
[1940-1950] +1.19 %/yr
[1950-1960] +0.21 %/yr
[1960-1970] -0.01 %/yr
[1970-1980] +2.39 %/yr
[1980-1990] +0.12 %/yr
[1990-2000] +1.84 %/yr
[2000-2005] +1.67 %/yr
[2005-2010] +2.03 %/yr
[2010-2014] +0.1 %/yr
Looking for settlements in Twin Falls County? Visit this page: Settlements in Twin Falls County, ID
Population of Twin Falls County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3183 | 3054 | 6,237 |
| 5 to 9 | 3402 | 3263 | 6,665 |
| 10 to 14 | 3082 | 2991 | 6,073 |
| 15 to 19 | 2741 | 2623 | 5,364 |
| 20 to 24 | 2600 | 2718 | 5,318 |
| 25 to 29 | 2642 | 2792 | 5,434 |
| 30 to 34 | 2836 | 2831 | 5,667 |
| 35 to 39 | 2647 | 2547 | 5,194 |
| 40 to 44 | 2296 | 2208 | 4,504 |
| 45 to 49 | 2153 | 2119 | 4,272 |
| 50 to 54 | 2501 | 2471 | 4,972 |
| 55 to 59 | 2349 | 2566 | 4,915 |
| 60 to 64 | 2086 | 2261 | 4,347 |
| 65 to 69 | 1777 | 1934 | 3,711 |
| 70 to 74 | 1387 | 1493 | 2,880 |
| 75 to 79 | 996 | 1239 | 2,235 |
| 80 to 84 | 656 | 879 | 1,535 |
| 85+ | 586 | 1005 | 1,591 |
Twin Falls 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 | 38396 | 39502 | 77,898 |
| WA | 37688 | 38811 | 76,499 |
| NH | 33413 | 35200 | 68,613 |
| NHWAC | 32335 | 34085 | 66,420 |
| NHWA | 31804 | 33590 | 65,394 |
| H | 6507 | 5794 | 12,301 |
| HWAC | 6061 | 5417 | 11,478 |
| HWA | 5884 | 5221 | 11,105 |
| IAC | 953 | 882 | 1,835 |
| AAC | 755 | 778 | 1,533 |
| TOM | 738 | 719 | 1,457 |
| NHAAC | 674 | 699 | 1,373 |
| AA | 548 | 577 | 1,125 |
| NHTOM | 551 | 515 | 1,066 |
| NHAA | 505 | 534 | 1,039 |
| IA | 542 | 494 | 1,036 |
| NHIAC | 526 | 496 | 1,022 |
| BAC | 442 | 420 | 862 |
| HIAC | 427 | 386 | 813 |
| NHBAC | 342 | 337 | 679 |
| BA | 316 | 290 | 606 |
| HIA | 303 | 254 | 557 |
| NHBA | 245 | 243 | 488 |
| NHIA | 239 | 240 | 479 |
| HTOM | 187 | 204 | 391 |
| NAC | 132 | 153 | 285 |
| NHNAC | 100 | 114 | 214 |
| NA | 88 | 103 | 191 |
| HBAC | 100 | 83 | 183 |
| HAAC | 81 | 79 | 160 |
| NHNA | 69 | 78 | 147 |
| HBA | 71 | 47 | 118 |
| HAA | 43 | 43 | 86 |
| HNAC | 32 | 39 | 71 |
| HNA | 19 | 25 | 44 |
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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
*Cassia Idaho Notes
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