Last official estimated population of Fall River County was 7,121 (year 2014)[1]. This was 0.002% of total US population and 0.8% of total South Dakota state population. Area of Fall River County is 1,749.1 mi² (=4530.2 km²), in this year population density was 4.07 p/mi². If population growth rate would be same as in period 2010-2014 (+0.1%/yr), Fall River County population in 2025 would be 7,196 [0].
Historical population of Fall River 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] -2.32 %/yr
[1900-1910] +8.17 %/yr
[1910-1920] -1.05 %/yr
[1920-1930] +2.27 %/yr
[1930-1940] -0.77 %/yr
[1940-1950] +2.58 %/yr
[1950-1960] +0.24 %/yr
[1960-1970] -3.47 %/yr
[1970-1980] +1.18 %/yr
[1980-1990] -1.37 %/yr
[1990-2000] +0.14 %/yr
[2000-2005] -0.74 %/yr
[2005-2010] -0.24 %/yr
[2010-2014] +0.1 %/yr
Looking for settlements in Fall River County? Visit this page: Settlements in Fall River County, SD
Population of Fall River County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 142 | 84 | 226 |
| 5 to 9 | 181 | 161 | 342 |
| 10 to 14 | 208 | 195 | 403 |
| 15 to 19 | 230 | 176 | 406 |
| 20 to 24 | 150 | 134 | 284 |
| 25 to 29 | 129 | 146 | 275 |
| 30 to 34 | 155 | 146 | 301 |
| 35 to 39 | 143 | 169 | 312 |
| 40 to 44 | 157 | 180 | 337 |
| 45 to 49 | 216 | 180 | 396 |
| 50 to 54 | 267 | 242 | 509 |
| 55 to 59 | 286 | 297 | 583 |
| 60 to 64 | 342 | 343 | 685 |
| 65 to 69 | 311 | 277 | 588 |
| 70 to 74 | 209 | 207 | 416 |
| 75 to 79 | 171 | 168 | 339 |
| 80 to 84 | 94 | 126 | 220 |
| 85+ | 80 | 143 | 223 |
Fall River 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 | 3349 | 3240 | 6,589 |
| WAC | 3142 | 3067 | 6,209 |
| NHWAC | 3047 | 2964 | 6,011 |
| WA | 3035 | 2968 | 6,003 |
| NHWA | 2946 | 2872 | 5,818 |
| IAC | 338 | 313 | 651 |
| NHIAC | 314 | 284 | 598 |
| IA | 247 | 232 | 479 |
| NHIA | 227 | 208 | 435 |
| H | 122 | 134 | 256 |
| TOM | 115 | 107 | 222 |
| NHTOM | 108 | 100 | 208 |
| HWAC | 95 | 103 | 198 |
| HWA | 89 | 96 | 185 |
| BAC | 69 | 45 | 114 |
| NHBAC | 63 | 40 | 103 |
| AAC | 35 | 55 | 90 |
| NHAAC | 33 | 51 | 84 |
| BA | 51 | 26 | 77 |
| NHBA | 45 | 22 | 67 |
| AA | 20 | 40 | 60 |
| NHAA | 20 | 37 | 57 |
| HIAC | 24 | 29 | 53 |
| HIA | 20 | 24 | 44 |
| HTOM | 7 | 7 | 14 |
| HBAC | 6 | 5 | 11 |
| NAC | 7 | 3 | 10 |
| HBA | 6 | 4 | 10 |
| NHNAC | 5 | 3 | 8 |
| HAAC | 2 | 4 | 6 |
| NHNA | 3 | 1 | 4 |
| NA | 3 | 1 | 4 |
| HAA | 0 | 3 | 3 |
| HNAC | 2 | 0 | 2 |
| HNA | 0 | 0 | 0 |
• Pennington County population
64 mi, 
32°
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79.2 mi, 
349°
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48.5 mi, 
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• Box Butte County
73.2 mi, 
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• Dawes County
40.1 mi, 
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• Custer County
32.1 mi, 
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• Weston County
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• Sheridan County
75.9 mi, 
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• Niobrara County
49.4 mi, 
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• Sioux County
53.1 mi, 
192°
[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
*Custer South Dakota Notes
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