Last official estimated population of Mellette County was 2,037 (year 2014)[1]. This was 0.001% of total US population and 0.2% of total South Dakota state population. Area of Mellette County is 1,310.9 mi² (=3395.1 km²), in this year population density was 1.55 p/mi². If population growth rate would be same as in period 2010-2014 (-0.13%/yr), Mellette County population in 2024 would be 2,010 [0].
Historical population of Mellette 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] +8.52 %/yr
[1920-1930] +3.23 %/yr
[1930-1940] -2.51 %/yr
[1940-1950] -2.94 %/yr
[1950-1960] -1.33 %/yr
[1960-1970] -0.96 %/yr
[1970-1980] -0.73 %/yr
[1980-1990] -0.51 %/yr
[1990-2000] -0.26 %/yr
[2000-2005] -0.54 %/yr
[2005-2010] +0.21 %/yr
[2010-2014] -0.13 %/yr
Looking for settlements in Mellette County? Visit this page: Settlements in Mellette County, SD
Population of Mellette County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 127 | 70 | 197 |
| 5 to 9 | 100 | 77 | 177 |
| 10 to 14 | 100 | 77 | 177 |
| 15 to 19 | 74 | 80 | 154 |
| 20 to 24 | 79 | 63 | 142 |
| 25 to 29 | 48 | 63 | 111 |
| 30 to 34 | 39 | 60 | 99 |
| 35 to 39 | 46 | 50 | 96 |
| 40 to 44 | 54 | 48 | 102 |
| 45 to 49 | 70 | 52 | 122 |
| 50 to 54 | 78 | 71 | 149 |
| 55 to 59 | 64 | 61 | 125 |
| 60 to 64 | 74 | 47 | 121 |
| 65 to 69 | 54 | 55 | 109 |
| 70 to 74 | 21 | 39 | 60 |
| 75 to 79 | 40 | 33 | 73 |
| 80 to 84 | 19 | 25 | 44 |
| 85+ | 22 | 20 | 42 |
Mellette 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 | 1069 | 967 | 2,036 |
| IAC | 648 | 543 | 1,191 |
| NHIAC | 623 | 532 | 1,155 |
| IA | 606 | 494 | 1,100 |
| NHIA | 581 | 484 | 1,065 |
| WAC | 497 | 485 | 982 |
| NHWAC | 482 | 472 | 954 |
| WA | 439 | 434 | 873 |
| NHWA | 425 | 421 | 846 |
| TOM | 59 | 55 | 114 |
| NHTOM | 58 | 54 | 112 |
| H | 40 | 24 | 64 |
| HIAC | 25 | 11 | 36 |
| HIA | 25 | 10 | 35 |
| BAC | 16 | 12 | 28 |
| HWAC | 15 | 13 | 28 |
| HWA | 14 | 13 | 27 |
| NHBAC | 15 | 11 | 26 |
| NHAAC | 7 | 5 | 12 |
| AAC | 7 | 5 | 12 |
| BA | 4 | 3 | 7 |
| NHBA | 4 | 3 | 7 |
| AA | 1 | 5 | 6 |
| NHAA | 1 | 5 | 6 |
| HTOM | 1 | 1 | 2 |
| HBAC | 1 | 1 | 2 |
| NAC | 0 | 1 | 1 |
| NHNAC | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
• Hughes County population
67.7 mi, 
35°
• Todd County
26.1 mi, 
174°
• Cherry County
71.5 mi, 
191°
• Tripp County
47.2 mi, 
110°
• Lyman County
50.6 mi, 
64°
• Bennett County
53.6 mi, 
239°
• Jackson County
43.7 mi, 
278°
• Stanley County
57.4 mi, 
0°
• Haakon County
63.6 mi, 
319°
• Jones County
25.6 mi, 
8°
[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
*Rosebud Reservation South Dakota Notes
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