Last official estimated population of Roberts County was 10,182 (year 2014)[1]. This was 0.003% of total US population and 1.2% of total South Dakota state population. Area of Roberts County is 1,135.8 mi² (=2941.7 km²), in this year population density was 8.96 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Roberts County population in 2024 would be 10,265 [0].
Historical population of Roberts County for period 1890-2014 [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
[1890-1900] +19.85 %/yr
[1900-1910] +2 %/yr
[1910-1920] +1.04 %/yr
[1920-1930] -0.45 %/yr
[1930-1940] +0.07 %/yr
[1940-1950] -0.62 %/yr
[1950-1960] -1.23 %/yr
[1960-1970] -1.21 %/yr
[1970-1980] -0.68 %/yr
[1980-1990] -0.95 %/yr
[1990-2000] +0.1 %/yr
[2000-2005] -0.15 %/yr
[2005-2010] +0.42 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Roberts County? Visit this page: Settlements in Roberts County, SD
Population of Roberts County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 450 | 456 | 906 |
| 5 to 9 | 408 | 426 | 834 |
| 10 to 14 | 367 | 362 | 729 |
| 15 to 19 | 418 | 343 | 761 |
| 20 to 24 | 302 | 304 | 606 |
| 25 to 29 | 234 | 248 | 482 |
| 30 to 34 | 235 | 265 | 500 |
| 35 to 39 | 264 | 249 | 513 |
| 40 to 44 | 253 | 256 | 509 |
| 45 to 49 | 275 | 305 | 580 |
| 50 to 54 | 357 | 322 | 679 |
| 55 to 59 | 373 | 326 | 699 |
| 60 to 64 | 339 | 356 | 695 |
| 65 to 69 | 309 | 251 | 560 |
| 70 to 74 | 216 | 217 | 433 |
| 75 to 79 | 173 | 169 | 342 |
| 80 to 84 | 119 | 150 | 269 |
| 85+ | 90 | 187 | 277 |
Roberts 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 | 5057 | 5070 | 10,127 |
| WAC | 3295 | 3169 | 6,464 |
| NHWAC | 3231 | 3114 | 6,345 |
| WA | 3160 | 2998 | 6,158 |
| NHWA | 3099 | 2949 | 6,048 |
| IAC | 1925 | 2133 | 4,058 |
| NHIAC | 1866 | 2064 | 3,930 |
| IA | 1816 | 1982 | 3,798 |
| NHIA | 1761 | 1919 | 3,680 |
| TOM | 140 | 182 | 322 |
| NHTOM | 136 | 173 | 309 |
| H | 125 | 122 | 247 |
| HIAC | 59 | 69 | 128 |
| HWAC | 64 | 55 | 119 |
| HIA | 55 | 63 | 118 |
| HWA | 61 | 49 | 110 |
| BAC | 69 | 35 | 104 |
| NHBAC | 64 | 33 | 97 |
| AAC | 37 | 40 | 77 |
| NHAAC | 36 | 35 | 71 |
| BA | 47 | 16 | 63 |
| NHBA | 42 | 15 | 57 |
| AA | 19 | 14 | 33 |
| NHAA | 19 | 14 | 33 |
| HTOM | 4 | 9 | 13 |
| NAC | 4 | 5 | 9 |
| NHNAC | 4 | 4 | 8 |
| HBAC | 5 | 2 | 7 |
| HBA | 5 | 1 | 6 |
| HAAC | 1 | 5 | 6 |
| HNAC | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Codington County population
47 mi, 
195°
• Richland County
44.3 mi, 
0°
• Stevens County
46.2 mi, 
92°
• Grant County
32.3 mi, 
164°
• Grant County
49.9 mi, 
64°
• Day County
35.9 mi, 
238°
• Big Stone County
29.9 mi, 
118°
• Marshall County
31.6 mi, 
284°
• Sargent County
46.9 mi, 
315°
• Traverse County
25 mi, 
66°
[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
*Sisseton and Wahpeton Reservation, Grant South Dakota Notes
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