Last official estimated population of Keystone town (Pennington County**, South Dakota state) was 344 (year 2014)[1]. This was 0% of total US population and 0.04% of total South Dakota state population. Area of Keystone town is 2.9 mi² (=7.4 km²)[6], in this year population density was 120.28 p/mi². If population growth rate would be same as in period 2010-2014 (+0.52%/yr), Keystone town population in 2024 would be 362*.
Historical population of Keystone town for period 1980-2014:
Estimated population for 2014[1]. Click on flag to hide it.
Population • Legends • Position
[1980-1990] -2.37 %/yr
[1990-2000] +2.97 %/yr
[2000-2005] +0.38 %/yr
[2005-2010] +1.23 %/yr
[2010-2014] +0.52 %/yr
• Rapid City city population
16 mi, 
40°
• Box Elder city
23 mi, 
49°
• Summerset city
21.3 mi, 
10°
• Custer city
12.5 mi, 
224°
• Hill City city
7.5 mi, 
290°
• Piedmont city
22.1 mi, 7°
• Hermosa town
12.3 mi, 
108°
• Buffalo Gap town
28.4 mi, 
168°
• Pringle town
21.5 mi, 
202°
• Fairburn town
18.1 mi, 
142°
*Calculated by population.us from last known population growth rate, not official data.
**Some cities are placed on more than one county. Only 1 county is shown.
[1] Cities and Towns (Incorporated Places and Minor Civil Divisions) 2014, archived from the original, retrieved 02/23/2016
[2] City and Town Intercensal Estimates (2000-2010), archived from the original, retrieved 02/23/2016
[3] Places: 1990 and 1999 Populations, With Numeric and Percent Population Change, archived from the original, retrieved 02/23/2016
[4] Population of the 100 Largest Urban Places: 1980,
[5] Population of the 100 Largest Urban Places in history,
[6] Area, latitude longitude data, retrieved 02/23/2016
[7] Through the Decades, Overview 1790-2010, PDF, large files! >100 Mb
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