Last official estimated population of Grant County was 7,346 (year 2014)[1]. This was 0.002% of total US population and 0.9% of total South Dakota state population. Area of Grant County is 687.5 mi² (=1780.7 km²), in this year population density was 10.68 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Grant County population in 2025 would be 7,319 [0].
Historical population of Grant 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] +8.51 %/yr
[1890-1900] +2.94 %/yr
[1900-1910] +1.25 %/yr
[1910-1920] +0.55 %/yr
[1920-1930] -0.14 %/yr
[1930-1940] -0.17 %/yr
[1940-1950] -0.31 %/yr
[1950-1960] -0.32 %/yr
[1960-1970] -0.96 %/yr
[1970-1980] +0.01 %/yr
[1980-1990] -0.74 %/yr
[1990-2000] -0.65 %/yr
[2000-2005] -1.02 %/yr
[2005-2010] -0.26 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Grant County? Visit this page: Settlements in Grant County, SD
Population of Grant County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 215 | 197 | 412 |
| 5 to 9 | 259 | 196 | 455 |
| 10 to 14 | 227 | 228 | 455 |
| 15 to 19 | 243 | 233 | 476 |
| 20 to 24 | 208 | 165 | 373 |
| 25 to 29 | 162 | 123 | 285 |
| 30 to 34 | 179 | 187 | 366 |
| 35 to 39 | 215 | 196 | 411 |
| 40 to 44 | 228 | 174 | 402 |
| 45 to 49 | 188 | 193 | 381 |
| 50 to 54 | 333 | 312 | 645 |
| 55 to 59 | 323 | 273 | 596 |
| 60 to 64 | 280 | 259 | 539 |
| 65 to 69 | 196 | 232 | 428 |
| 70 to 74 | 157 | 165 | 322 |
| 75 to 79 | 124 | 146 | 270 |
| 80 to 84 | 82 | 113 | 195 |
| 85+ | 91 | 139 | 230 |
Grant 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 | 3615 | 3453 | 7,068 |
| NH | 3598 | 3438 | 7,036 |
| WA | 3580 | 3418 | 6,998 |
| NHWAC | 3508 | 3364 | 6,872 |
| NHWA | 3479 | 3333 | 6,812 |
| H | 112 | 93 | 205 |
| HWAC | 107 | 89 | 196 |
| HWA | 101 | 85 | 186 |
| IAC | 55 | 65 | 120 |
| NHIAC | 49 | 60 | 109 |
| BAC | 58 | 26 | 84 |
| NHBAC | 56 | 26 | 82 |
| TOM | 39 | 41 | 80 |
| BA | 51 | 18 | 69 |
| NHTOM | 32 | 37 | 69 |
| NHBA | 50 | 18 | 68 |
| IA | 27 | 36 | 63 |
| NHIA | 27 | 34 | 61 |
| AAC | 19 | 24 | 43 |
| NHAAC | 17 | 21 | 38 |
| AA | 11 | 17 | 28 |
| NHAA | 10 | 15 | 25 |
| HTOM | 7 | 4 | 11 |
| HIAC | 6 | 5 | 11 |
| NAC | 4 | 5 | 9 |
| NHNAC | 2 | 5 | 7 |
| HAAC | 2 | 3 | 5 |
| NA | 2 | 1 | 3 |
| HAA | 1 | 2 | 3 |
| HNAC | 2 | 0 | 2 |
| HBAC | 2 | 0 | 2 |
| HNA | 2 | 0 | 2 |
| HIA | 0 | 2 | 2 |
| HBA | 1 | 0 | 1 |
| NHNA | 0 | 1 | 1 |
• Codington County population
25.2 mi, 
235°
• Roberts County
32.3 mi, 
344°
• Stevens County
47.7 mi, 
52°
• Lac qui Parle County
31.4 mi, 
112°
• Hamlin County
39.4 mi, 
210°
• Day County
41.3 mi, 
287°
• Big Stone County
24.8 mi, 46°
• Deuel County
29 mi, 
172°
• Clark County
51.4 mi, 244°
• Traverse County
43.7 mi, 
19°
[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
*Deuel South Dakota Notes
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