Last official estimated population of Walworth County was 5,446 (year 2014)[1]. This was 0.002% of total US population and 0.6% of total South Dakota state population. Area of Walworth County is 744.6 mi² (=1928.6 km²), in this year population density was 7.31 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Walworth County population in 2025 would be 5,468 [0].
Historical population of Walworth 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] +46.9 %/yr
[1890-1900] +5.95 %/yr
[1900-1910] +5.39 %/yr
[1910-1920] +2.67 %/yr
[1920-1930] +0.4 %/yr
[1930-1940] -1.88 %/yr
[1940-1950] +0.5 %/yr
[1950-1960] +0.57 %/yr
[1960-1970] -0.32 %/yr
[1970-1980] -1.11 %/yr
[1980-1990] -1.4 %/yr
[1990-2000] -0.2 %/yr
[2000-2005] -1.6 %/yr
[2005-2010] -0.25 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Walworth County? Visit this page: Settlements in Walworth County, SD
Population of Walworth County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 156 | 174 | 330 |
| 5 to 9 | 152 | 185 | 337 |
| 10 to 14 | 200 | 154 | 354 |
| 15 to 19 | 161 | 154 | 315 |
| 20 to 24 | 140 | 126 | 266 |
| 25 to 29 | 148 | 147 | 295 |
| 30 to 34 | 151 | 136 | 287 |
| 35 to 39 | 147 | 117 | 264 |
| 40 to 44 | 121 | 119 | 240 |
| 45 to 49 | 138 | 159 | 297 |
| 50 to 54 | 201 | 193 | 394 |
| 55 to 59 | 205 | 193 | 398 |
| 60 to 64 | 193 | 204 | 397 |
| 65 to 69 | 176 | 182 | 358 |
| 70 to 74 | 128 | 140 | 268 |
| 75 to 79 | 114 | 150 | 264 |
| 80 to 84 | 80 | 112 | 192 |
| 85+ | 86 | 169 | 255 |
Walworth 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 | 2640 | 2770 | 5,410 |
| WAC | 2336 | 2375 | 4,711 |
| NHWAC | 2292 | 2343 | 4,635 |
| WA | 2252 | 2286 | 4,538 |
| NHWA | 2209 | 2258 | 4,467 |
| IAC | 409 | 484 | 893 |
| NHIAC | 397 | 471 | 868 |
| IA | 335 | 412 | 747 |
| NHIA | 324 | 401 | 725 |
| TOM | 87 | 90 | 177 |
| NHTOM | 85 | 86 | 171 |
| H | 57 | 44 | 101 |
| HWAC | 44 | 32 | 76 |
| HWA | 43 | 28 | 71 |
| BAC | 33 | 27 | 60 |
| NHBAC | 30 | 26 | 56 |
| BA | 15 | 14 | 29 |
| NHBA | 14 | 13 | 27 |
| AAC | 10 | 16 | 26 |
| HIAC | 12 | 13 | 25 |
| NHAAC | 10 | 15 | 25 |
| HIA | 11 | 11 | 22 |
| AA | 8 | 12 | 20 |
| NHAA | 8 | 12 | 20 |
| HTOM | 2 | 4 | 6 |
| HBAC | 3 | 1 | 4 |
| NAC | 0 | 4 | 4 |
| NHNAC | 0 | 3 | 3 |
| HBA | 1 | 1 | 2 |
| HNAC | 0 | 1 | 1 |
| HAAC | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Dewey County population
43.9 mi, 
243°
• Edmunds County
39.9 mi, 
91°
• Corson County
58.5 mi, 
287°
• Emmons County
60 mi, 
350°
• McIntosh County
55.3 mi, 
30°
• McPherson County
46.5 mi, 
58°
• Faulk County
49.3 mi, 
120°
• Potter County
26.1 mi, 
172°
• Campbell County
24.8 mi, 
2°
• Sully County
49 mi, 
185°
[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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