Last official estimated population of Lake County was 11,275 (year 2014)[1]. This was 0.004% of total US population and 1.3% of total South Dakota state population. Area of Lake County is 575.2 mi² (=1489.7 km²), in this year population density was 19.60 p/mi². If population growth rate would be same as in period 2010-2014 (+0.17%/yr), Lake County population in 2024 would be 11,465 [0].
Historical population of Lake 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] +10.95 %/yr
[1890-1900] +1.98 %/yr
[1900-1910] +1.6 %/yr
[1910-1920] +1.36 %/yr
[1920-1930] +0.1 %/yr
[1930-1940] +0.03 %/yr
[1940-1950] -0.51 %/yr
[1950-1960] -0.02 %/yr
[1960-1970] -0.26 %/yr
[1970-1980] -0.66 %/yr
[1980-1990] -0.16 %/yr
[1990-2000] +0.66 %/yr
[2000-2005] -1.17 %/yr
[2005-2010] +1.06 %/yr
[2010-2014] +0.17 %/yr
Looking for settlements in Lake County? Visit this page: Settlements in Lake County, SD
Population of Lake County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 363 | 319 | 682 |
| 5 to 9 | 335 | 329 | 664 |
| 10 to 14 | 368 | 305 | 673 |
| 15 to 19 | 494 | 425 | 919 |
| 20 to 24 | 497 | 386 | 883 |
| 25 to 29 | 350 | 279 | 629 |
| 30 to 34 | 342 | 302 | 644 |
| 35 to 39 | 340 | 271 | 611 |
| 40 to 44 | 262 | 264 | 526 |
| 45 to 49 | 321 | 315 | 636 |
| 50 to 54 | 457 | 472 | 929 |
| 55 to 59 | 485 | 558 | 1,043 |
| 60 to 64 | 560 | 524 | 1,084 |
| 65 to 69 | 517 | 402 | 919 |
| 70 to 74 | 294 | 257 | 551 |
| 75 to 79 | 162 | 205 | 367 |
| 80 to 84 | 124 | 148 | 272 |
| 85+ | 122 | 214 | 336 |
Lake 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 | 6229 | 5848 | 12,077 |
| WAC | 6209 | 5798 | 12,007 |
| WA | 6134 | 5724 | 11,858 |
| NHWAC | 6068 | 5685 | 11,753 |
| NHWA | 6000 | 5619 | 11,619 |
| H | 164 | 127 | 291 |
| HWAC | 141 | 113 | 254 |
| HWA | 134 | 105 | 239 |
| IAC | 98 | 100 | 198 |
| BAC | 105 | 66 | 171 |
| NHIAC | 85 | 84 | 169 |
| TOM | 82 | 78 | 160 |
| NHBAC | 90 | 61 | 151 |
| AAC | 56 | 87 | 143 |
| NHTOM | 73 | 69 | 142 |
| NHAAC | 52 | 86 | 138 |
| BA | 80 | 45 | 125 |
| AA | 45 | 75 | 120 |
| NHAA | 42 | 75 | 117 |
| NHBA | 70 | 44 | 114 |
| IA | 51 | 52 | 103 |
| NHIA | 43 | 40 | 83 |
| HIAC | 13 | 16 | 29 |
| HBAC | 15 | 5 | 20 |
| HIA | 8 | 12 | 20 |
| HTOM | 9 | 9 | 18 |
| NAC | 9 | 3 | 12 |
| HBA | 10 | 1 | 11 |
| NHNAC | 7 | 2 | 9 |
| HAAC | 4 | 1 | 5 |
| HAA | 3 | 0 | 3 |
| HNAC | 2 | 1 | 3 |
| NHNA | 1 | 1 | 2 |
| NA | 1 | 1 | 2 |
| HNA | 0 | 0 | 0 |
• Minnehaha County population
29.8 mi, 
146°
• Brookings County
29 mi, 
33°
• Pipestone County
43 mi, 
91°
• Moody County
22.2 mi, 92°
• Hamlin County
45.1 mi, 
356°
• McCook County
26.9 mi, 
206°
• Kingsbury County
29.7 mi, 
321°
• Hanson County
41.3 mi, 
234°
• Miner County
24.1 mi, 
268°
• Sanborn County
48.1 mi, 269°
[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
*Brookings, Minnehaha South Dakota Notes
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