Last official estimated population of Buffalo County was 1,942 (year 2014)[1]. This was 0.001% of total US population and 0.2% of total South Dakota state population. Area of Buffalo County is 487.7 mi² (=1263.3 km²), in this year population density was 3.98 p/mi². If population growth rate would be same as in period 2010-2014 (+0.39%/yr), Buffalo County population in 2026 would be 2,035 [0].
Historical population of Buffalo County for period 1870-2014 [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
[1870-1880] -12.73 %/yr
[1880-1890] +31.75 %/yr
[1890-1900] +6.07 %/yr
[1900-1910] -1.18 %/yr
[1910-1920] +0.77 %/yr
[1920-1930] +1.19 %/yr
[1930-1940] -0.41 %/yr
[1940-1950] -1.37 %/yr
[1950-1960] -0.43 %/yr
[1960-1970] +1.18 %/yr
[1970-1980] +0.32 %/yr
[1980-1990] -0.2 %/yr
[1990-2000] +1.45 %/yr
[2000-2005] -0.73 %/yr
[2005-2010] -0.48 %/yr
[2010-2014] +0.39 %/yr
Looking for settlements in Buffalo County? Visit this page: Settlements in Buffalo County, SD
Population of Buffalo County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 143 | 133 | 276 |
| 5 to 9 | 107 | 127 | 234 |
| 10 to 14 | 110 | 107 | 217 |
| 15 to 19 | 91 | 88 | 179 |
| 20 to 24 | 77 | 66 | 143 |
| 25 to 29 | 68 | 77 | 145 |
| 30 to 34 | 75 | 69 | 144 |
| 35 to 39 | 69 | 50 | 119 |
| 40 to 44 | 51 | 51 | 102 |
| 45 to 49 | 49 | 53 | 102 |
| 50 to 54 | 35 | 53 | 88 |
| 55 to 59 | 54 | 48 | 102 |
| 60 to 64 | 41 | 36 | 77 |
| 65 to 69 | 23 | 31 | 54 |
| 70 to 74 | 16 | 27 | 43 |
| 75 to 79 | 18 | 14 | 32 |
| 80 to 84 | 3 | 6 | 9 |
| 85+ | 5 | 6 | 11 |
Buffalo 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 | 1001 | 1004 | 2,005 |
| IAC | 827 | 835 | 1,662 |
| IA | 820 | 814 | 1,634 |
| NHIAC | 803 | 802 | 1,605 |
| NHIA | 797 | 788 | 1,585 |
| WAC | 204 | 220 | 424 |
| NHWAC | 193 | 209 | 402 |
| WA | 187 | 196 | 383 |
| NHWA | 179 | 193 | 372 |
| H | 34 | 38 | 72 |
| HIAC | 24 | 33 | 57 |
| HIA | 23 | 26 | 49 |
| TOM | 17 | 29 | 46 |
| NHTOM | 14 | 20 | 34 |
| BAC | 15 | 13 | 28 |
| NHBAC | 13 | 12 | 25 |
| HWAC | 11 | 11 | 22 |
| NHBA | 10 | 2 | 12 |
| BA | 10 | 2 | 12 |
| HTOM | 3 | 9 | 12 |
| HWA | 8 | 3 | 11 |
| AAC | 6 | 3 | 9 |
| NHAAC | 6 | 1 | 7 |
| HBAC | 2 | 1 | 3 |
| AA | 1 | 1 | 2 |
| NHAA | 1 | 1 | 2 |
| NHNAC | 0 | 2 | 2 |
| NAC | 0 | 2 | 2 |
| HAAC | 0 | 2 | 2 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Davison County population
57.9 mi, 
115°
• Beadle County
52.6 mi, 
60°
• Hughes County
44.9 mi, 
301°
• Brule County
22.4 mi, 
165°
• Lyman County
33.4 mi, 
251°
• Hand County
36.1 mi, 
15°
• Aurora County
38.2 mi, 
125°
• Sanborn County
55.3 mi, 
91°
• Jerauld County
28.9 mi, 87°
• Hyde County
36.9 mi, 
337°
[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
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