Last official estimated population of Sully County was 1,374 (year 2014)[1]. This was 0% of total US population and 0.2% of total South Dakota state population. Area of Sully County is 1,070.3 mi² (=2772 km²), in this year population density was 1.28 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Sully County population in 2026 would be 1,377 [0].
Historical population of Sully 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] +23.34 %/yr
[1890-1900] -3.35 %/yr
[1900-1910] +3.68 %/yr
[1910-1920] +1.41 %/yr
[1920-1930] +3.13 %/yr
[1930-1940] -3.61 %/yr
[1940-1950] +0.17 %/yr
[1950-1960] -0.4 %/yr
[1960-1970] -0.98 %/yr
[1970-1980] -1.7 %/yr
[1980-1990] -2.23 %/yr
[1990-2000] -0.23 %/yr
[2000-2005] -1.96 %/yr
[2005-2010] -0.49 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Sully County? Visit this page: Settlements in Sully County, SD
Population of Sully County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 40 | 31 | 71 |
| 5 to 9 | 49 | 40 | 89 |
| 10 to 14 | 49 | 46 | 95 |
| 15 to 19 | 46 | 33 | 79 |
| 20 to 24 | 46 | 26 | 72 |
| 25 to 29 | 44 | 35 | 79 |
| 30 to 34 | 38 | 40 | 78 |
| 35 to 39 | 33 | 34 | 67 |
| 40 to 44 | 38 | 31 | 69 |
| 45 to 49 | 53 | 47 | 100 |
| 50 to 54 | 60 | 53 | 113 |
| 55 to 59 | 73 | 60 | 133 |
| 60 to 64 | 77 | 46 | 123 |
| 65 to 69 | 39 | 31 | 70 |
| 70 to 74 | 32 | 31 | 63 |
| 75 to 79 | 33 | 32 | 65 |
| 80 to 84 | 15 | 26 | 41 |
| 85+ | 11 | 20 | 31 |
Sully 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 | 755 | 648 | 1,403 |
| WAC | 755 | 641 | 1,396 |
| WA | 737 | 630 | 1,367 |
| NHWAC | 735 | 627 | 1,362 |
| NHWA | 721 | 617 | 1,338 |
| IAC | 32 | 18 | 50 |
| NHIAC | 27 | 18 | 45 |
| H | 21 | 14 | 35 |
| HWAC | 20 | 14 | 34 |
| TOM | 19 | 11 | 30 |
| HWA | 16 | 13 | 29 |
| IA | 16 | 12 | 28 |
| NHIA | 15 | 12 | 27 |
| NHTOM | 15 | 10 | 25 |
| BAC | 7 | 13 | 20 |
| NHBAC | 6 | 12 | 18 |
| BA | 4 | 8 | 12 |
| NHBA | 4 | 8 | 12 |
| HIAC | 5 | 0 | 5 |
| HTOM | 4 | 1 | 5 |
| AAC | 2 | 1 | 3 |
| NHAAC | 2 | 1 | 3 |
| HBAC | 1 | 1 | 2 |
| HIA | 1 | 0 | 1 |
| NHAA | 0 | 1 | 1 |
| AA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| NHNAC | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| NAC | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Hughes County population
24.6 mi, 
161°
• Walworth County
49 mi, 
5°
• Dewey County
45.4 mi, 
310°
• Lyman County
58.9 mi, 
165°
• Hand County
56.7 mi, 
102°
• Stanley County
37.1 mi, 
235°
• Faulk County
53.4 mi, 
63°
• Potter County
24.3 mi, 
19°
• Hyde County
33.9 mi, 
112°
• Jones County
59.9 mi, 
207°
[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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