Last official estimated population of Dewey County was 5,329 (year 2014)[1]. This was 0.002% of total US population and 0.6% of total South Dakota state population. Area of Dewey County is 2,445.3 mi² (=6333.2 km²), in this year population density was 2.18 p/mi². If population growth rate would be same as in period 2010-2014 (+0.13%/yr), Dewey County population in 2026 would be 5,414 [0].
Historical population of Dewey 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
[1880-1910] +11.31 %/yr
[1910-1920] +15.41 %/yr
[1920-1930] +3.04 %/yr
[1930-1940] -1.25 %/yr
[1940-1950] -1.48 %/yr
[1950-1960] +0.67 %/yr
[1960-1970] -0.17 %/yr
[1970-1980] +0.37 %/yr
[1980-1990] +0.29 %/yr
[1990-2000] +0.78 %/yr
[2000-2005] -1.04 %/yr
[2005-2010] -1.33 %/yr
[2010-2014] +0.13 %/yr
Looking for settlements in Dewey County? Visit this page: Settlements in Dewey County, SD
Population of Dewey County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 328 | 337 | 665 |
| 5 to 9 | 272 | 261 | 533 |
| 10 to 14 | 247 | 268 | 515 |
| 15 to 19 | 206 | 231 | 437 |
| 20 to 24 | 196 | 213 | 409 |
| 25 to 29 | 164 | 177 | 341 |
| 30 to 34 | 191 | 174 | 365 |
| 35 to 39 | 142 | 161 | 303 |
| 40 to 44 | 118 | 163 | 281 |
| 45 to 49 | 164 | 160 | 324 |
| 50 to 54 | 198 | 196 | 394 |
| 55 to 59 | 151 | 155 | 306 |
| 60 to 64 | 112 | 112 | 224 |
| 65 to 69 | 88 | 95 | 183 |
| 70 to 74 | 60 | 70 | 130 |
| 75 to 79 | 45 | 60 | 105 |
| 80 to 84 | 29 | 53 | 82 |
| 85+ | 28 | 37 | 65 |
Dewey 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 | 2633 | 2832 | 5,465 |
| IAC | 2054 | 2243 | 4,297 |
| NHIAC | 1984 | 2164 | 4,148 |
| IA | 1957 | 2163 | 4,120 |
| NHIA | 1896 | 2086 | 3,982 |
| WAC | 761 | 741 | 1,502 |
| NHWAC | 720 | 728 | 1,448 |
| WA | 643 | 649 | 1,292 |
| NHWA | 615 | 639 | 1,254 |
| TOM | 122 | 97 | 219 |
| NHTOM | 109 | 94 | 203 |
| H | 106 | 91 | 197 |
| HIAC | 70 | 79 | 149 |
| HIA | 61 | 77 | 138 |
| HWAC | 41 | 13 | 54 |
| BAC | 28 | 19 | 47 |
| NHBAC | 23 | 17 | 40 |
| HWA | 28 | 10 | 38 |
| AAC | 20 | 18 | 38 |
| NHAAC | 17 | 17 | 34 |
| BA | 14 | 7 | 21 |
| NHBA | 11 | 6 | 17 |
| HTOM | 13 | 3 | 16 |
| AA | 3 | 7 | 10 |
| NHAA | 2 | 7 | 9 |
| HBAC | 5 | 2 | 7 |
| HBA | 3 | 1 | 4 |
| HAAC | 3 | 1 | 4 |
| NAC | 2 | 2 | 4 |
| NHNAC | 2 | 1 | 3 |
| HAA | 1 | 0 | 1 |
| HNAC | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Hughes County population
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• Stanley County
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• Ziebach County
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• Potter County
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• Haakon County
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• Campbell County
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• Sully County
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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
See note 5 South Dakota Notes
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