Last official estimated population of Day County was 5,715 (year 2014)[1]. This was 0.002% of total US population and 0.7% of total South Dakota state population. Area of Day County is 1,091.1 mi² (=2825.9 km²), in this year population density was 5.24 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Day County population in 2025 would be 5,729 [0].
Historical population of Day 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
[1880-1890] +44.5 %/yr
[1890-1900] +2.94 %/yr
[1900-1910] +1.61 %/yr
[1910-1920] +0.56 %/yr
[1920-1930] -0.39 %/yr
[1930-1940] -0.74 %/yr
[1940-1950] -0.98 %/yr
[1950-1960] -1.55 %/yr
[1960-1970] -1.86 %/yr
[1970-1980] -0.69 %/yr
[1980-1990] -1.52 %/yr
[1990-2000] -1.1 %/yr
[2000-2005] -1.23 %/yr
[2005-2010] -0.56 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Day County? Visit this page: Settlements in Day County, SD
Population of Day County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 155 | 164 | 319 |
| 5 to 9 | 181 | 160 | 341 |
| 10 to 14 | 171 | 166 | 337 |
| 15 to 19 | 187 | 154 | 341 |
| 20 to 24 | 134 | 115 | 249 |
| 25 to 29 | 126 | 136 | 262 |
| 30 to 34 | 158 | 116 | 274 |
| 35 to 39 | 133 | 122 | 255 |
| 40 to 44 | 142 | 109 | 251 |
| 45 to 49 | 130 | 146 | 276 |
| 50 to 54 | 211 | 209 | 420 |
| 55 to 59 | 236 | 214 | 450 |
| 60 to 64 | 241 | 209 | 450 |
| 65 to 69 | 197 | 210 | 407 |
| 70 to 74 | 148 | 137 | 285 |
| 75 to 79 | 127 | 100 | 227 |
| 80 to 84 | 86 | 129 | 215 |
| 85+ | 77 | 152 | 229 |
Day 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 | 2773 | 2697 | 5,470 |
| WAC | 2566 | 2455 | 5,021 |
| NHWAC | 2508 | 2425 | 4,933 |
| WA | 2516 | 2410 | 4,926 |
| NHWA | 2462 | 2382 | 4,844 |
| IAC | 293 | 271 | 564 |
| NHIAC | 280 | 257 | 537 |
| IA | 254 | 236 | 490 |
| NHIA | 245 | 222 | 467 |
| H | 67 | 51 | 118 |
| TOM | 52 | 51 | 103 |
| NHTOM | 48 | 49 | 97 |
| HWAC | 58 | 30 | 88 |
| HWA | 54 | 28 | 82 |
| BAC | 24 | 37 | 61 |
| NHBAC | 23 | 29 | 52 |
| AAC | 11 | 38 | 49 |
| NHAAC | 11 | 37 | 48 |
| BA | 14 | 21 | 35 |
| NHAA | 4 | 30 | 34 |
| AA | 4 | 30 | 34 |
| NHBA | 14 | 14 | 28 |
| HIAC | 13 | 14 | 27 |
| HIA | 9 | 14 | 23 |
| HBAC | 1 | 8 | 9 |
| HBA | 0 | 7 | 7 |
| HTOM | 4 | 2 | 6 |
| NAC | 2 | 3 | 5 |
| NHNAC | 2 | 3 | 5 |
| HAAC | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Brown County population
40.7 mi, 
293°
• Codington County
32.7 mi, 
145°
• Roberts County
35.9 mi, 
58°
• Grant County
41.3 mi, 
107°
• Spink County
47.5 mi, 
231°
• Hamlin County
50.6 mi, 
157°
• Big Stone County
57.4 mi, 
85°
• Marshall County
26.4 mi, 
0°
• Sargent County
52.1 mi, 
357°
• Clark County
35.2 mi, 
191°
[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 4 South Dakota Notes
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