Last official estimated population of Sioux County was 33,716 (year 2014)[1]. This was 0.011% of total US population and 1.1% of total Iowa state population. Area of Sioux County is 769.0 mi² (=1991.7 km²), in this year population density was 43.84 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Sioux County population in 2026 would be 33,752 [0].
Historical population of Sioux County for period 1860-2014 [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
[1860-1870] +49.98 %/yr
[1870-1880] +25.14 %/yr
[1880-1890] +12.97 %/yr
[1890-1900] +2.42 %/yr
[1900-1910] +0.79 %/yr
[1910-1920] +0.47 %/yr
[1920-1930] +0.13 %/yr
[1930-1940] +0.15 %/yr
[1940-1950] -0.31 %/yr
[1950-1960] -0 %/yr
[1960-1970] +0.6 %/yr
[1970-1980] +0.96 %/yr
[1980-1990] -0.3 %/yr
[1990-2000] +0.55 %/yr
[2000-2005] +0.71 %/yr
[2005-2010] +0.59 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Sioux County? Visit this page: Settlements in Sioux County, IA
Population of Sioux County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1400 | 1174 | 2,574 |
| 5 to 9 | 1339 | 1387 | 2,726 |
| 10 to 14 | 1327 | 1254 | 2,581 |
| 15 to 19 | 1464 | 1551 | 3,015 |
| 20 to 24 | 1725 | 1524 | 3,249 |
| 25 to 29 | 968 | 900 | 1,868 |
| 30 to 34 | 1132 | 1019 | 2,151 |
| 35 to 39 | 1006 | 921 | 1,927 |
| 40 to 44 | 846 | 834 | 1,680 |
| 45 to 49 | 928 | 871 | 1,799 |
| 50 to 54 | 1097 | 975 | 2,072 |
| 55 to 59 | 1055 | 1070 | 2,125 |
| 60 to 64 | 949 | 930 | 1,879 |
| 65 to 69 | 643 | 645 | 1,288 |
| 70 to 74 | 490 | 606 | 1,096 |
| 75 to 79 | 413 | 503 | 916 |
| 80 to 84 | 297 | 466 | 763 |
| 85+ | 342 | 630 | 972 |
Sioux 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 | 16916 | 16835 | 33,751 |
| WA | 16806 | 16704 | 33,510 |
| NH | 15601 | 15677 | 31,278 |
| NHWAC | 15285 | 15410 | 30,695 |
| NHWA | 15190 | 15295 | 30,485 |
| H | 1820 | 1583 | 3,403 |
| HWAC | 1631 | 1425 | 3,056 |
| HWA | 1616 | 1409 | 3,025 |
| BAC | 281 | 216 | 497 |
| AAC | 205 | 224 | 429 |
| NHAAC | 192 | 207 | 399 |
| AA | 180 | 185 | 365 |
| BA | 211 | 149 | 360 |
| NHAA | 171 | 170 | 341 |
| NHBAC | 161 | 121 | 282 |
| TOM | 117 | 139 | 256 |
| IAC | 128 | 125 | 253 |
| NHTOM | 99 | 119 | 218 |
| HBAC | 120 | 95 | 215 |
| HBA | 110 | 87 | 197 |
| IA | 96 | 79 | 175 |
| NHBA | 101 | 62 | 163 |
| HIAC | 70 | 67 | 137 |
| NHIAC | 58 | 58 | 116 |
| HIA | 61 | 51 | 112 |
| NHIA | 35 | 28 | 63 |
| HTOM | 18 | 20 | 38 |
| HAAC | 13 | 17 | 30 |
| NAC | 15 | 9 | 24 |
| HAA | 9 | 15 | 24 |
| NA | 11 | 4 | 15 |
| NHNAC | 9 | 6 | 15 |
| HNAC | 6 | 3 | 9 |
| NHNA | 5 | 3 | 8 |
| HNA | 6 | 1 | 7 |
• Lincoln County population
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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
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