Last official estimated population of Sioux County was 4,146 (year 2014)[1]. This was 0.001% of total US population and 0.5% of total North Dakota state population. Area of Sioux County is 1,128.2 mi² (=2922.1 km²), in this year population density was 3.67 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Sioux County population in 2026 would be 4,125 [0].
Historical population of Sioux 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] +3.55 %/yr
[1930-1940] -0.59 %/yr
[1940-1950] -1.77 %/yr
[1950-1960] -0.09 %/yr
[1960-1970] -0.08 %/yr
[1970-1980] -0.03 %/yr
[1980-1990] +0.38 %/yr
[1990-2000] +0.73 %/yr
[2000-2005] +0.2 %/yr
[2005-2010] +0.34 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Sioux County? Visit this page: Settlements in Sioux County, ND
Population of Sioux County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 261 | 278 | 539 |
| 5 to 9 | 241 | 228 | 469 |
| 10 to 14 | 239 | 208 | 447 |
| 15 to 19 | 149 | 168 | 317 |
| 20 to 24 | 183 | 174 | 357 |
| 25 to 29 | 157 | 160 | 317 |
| 30 to 34 | 136 | 127 | 263 |
| 35 to 39 | 126 | 125 | 251 |
| 40 to 44 | 120 | 121 | 241 |
| 45 to 49 | 130 | 153 | 283 |
| 50 to 54 | 140 | 123 | 263 |
| 55 to 59 | 100 | 101 | 201 |
| 60 to 64 | 79 | 74 | 153 |
| 65 to 69 | 49 | 54 | 103 |
| 70 to 74 | 47 | 49 | 96 |
| 75 to 79 | 28 | 32 | 60 |
| 80 to 84 | 13 | 25 | 38 |
| 85+ | 15 | 9 | 24 |
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 |
| NH | 2138 | 2116 | 4,254 |
| IAC | 1818 | 1892 | 3,710 |
| IA | 1775 | 1839 | 3,614 |
| NHIAC | 1763 | 1805 | 3,568 |
| NHIA | 1723 | 1754 | 3,477 |
| WAC | 424 | 361 | 785 |
| NHWAC | 404 | 353 | 757 |
| WA | 364 | 293 | 657 |
| NHWA | 347 | 288 | 635 |
| H | 75 | 93 | 168 |
| HIAC | 55 | 87 | 142 |
| HIA | 52 | 85 | 137 |
| TOM | 63 | 70 | 133 |
| NHTOM | 59 | 67 | 126 |
| BAC | 24 | 16 | 40 |
| NHBAC | 21 | 15 | 36 |
| HWAC | 20 | 8 | 28 |
| HWA | 17 | 5 | 22 |
| AAC | 10 | 10 | 20 |
| NHAAC | 10 | 10 | 20 |
| BA | 7 | 5 | 12 |
| NHBA | 6 | 5 | 11 |
| HTOM | 4 | 3 | 7 |
| AA | 3 | 2 | 5 |
| NHAA | 3 | 2 | 5 |
| HBAC | 3 | 1 | 4 |
| NAC | 2 | 0 | 2 |
| HNAC | 1 | 0 | 1 |
| HBA | 1 | 0 | 1 |
| NHNAC | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| NHNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
• Burleigh County population
66 mi, 
25°
• Morton County
43 mi, 
344°
• Walworth County
68.6 mi, 
133°
• Dewey County
67.4 mi, 
170°
• Corson County
29.9 mi, 
190°
• Emmons County
41.2 mi, 
73°
• Hettinger County
70.2 mi, 
288°
• Grant County
32.5 mi, 
301°
• Adams County
70.5 mi, 
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• Campbell County
55.6 mi, 
113°
[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
*Morton North Dakota Notes
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