Last official estimated population of Yankton County was 22,455 (year 2014)[1]. This was 0.007% of total US population and 2.6% of total South Dakota state population. Area of Yankton County is 532.2 mi² (=1378.4 km²), in this year population density was 42.19 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Yankton County population in 2024 would be 22,498 [0].
Historical population of Yankton County for period 1870-2014 [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
[1870-1880] +14.87 %/yr
[1880-1890] +2.21 %/yr
[1890-1900] +1.93 %/yr
[1900-1910] +0.38 %/yr
[1910-1920] +1.49 %/yr
[1920-1930] +0.86 %/yr
[1930-1940] +0.08 %/yr
[1940-1950] +0.05 %/yr
[1950-1960] +0.44 %/yr
[1960-1970] +0.82 %/yr
[1970-1980] -0.05 %/yr
[1980-1990] +0.16 %/yr
[1990-2000] +1.18 %/yr
[2000-2005] +0.2 %/yr
[2005-2010] +0.51 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Yankton County? Visit this page: Settlements in Yankton County, SD
Population of Yankton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 676 | 641 | 1,317 |
| 5 to 9 | 669 | 649 | 1,318 |
| 10 to 14 | 668 | 616 | 1,284 |
| 15 to 19 | 721 | 713 | 1,434 |
| 20 to 24 | 740 | 708 | 1,448 |
| 25 to 29 | 789 | 592 | 1,381 |
| 30 to 34 | 896 | 597 | 1,493 |
| 35 to 39 | 728 | 585 | 1,313 |
| 40 to 44 | 743 | 577 | 1,320 |
| 45 to 49 | 828 | 654 | 1,482 |
| 50 to 54 | 913 | 812 | 1,725 |
| 55 to 59 | 899 | 823 | 1,722 |
| 60 to 64 | 753 | 717 | 1,470 |
| 65 to 69 | 565 | 590 | 1,155 |
| 70 to 74 | 437 | 450 | 887 |
| 75 to 79 | 283 | 380 | 663 |
| 80 to 84 | 214 | 304 | 518 |
| 85+ | 244 | 510 | 754 |
Yankton 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 | 11293 | 10649 | 21,942 |
| WAC | 10874 | 10497 | 21,371 |
| WA | 10712 | 10332 | 21,044 |
| NHWAC | 10473 | 10263 | 20,736 |
| NHWA | 10327 | 10112 | 20,439 |
| IAC | 542 | 369 | 911 |
| NHIAC | 482 | 339 | 821 |
| H | 473 | 269 | 742 |
| IA | 434 | 255 | 689 |
| HWAC | 401 | 234 | 635 |
| NHIA | 387 | 233 | 620 |
| HWA | 385 | 220 | 605 |
| BAC | 415 | 123 | 538 |
| NHBAC | 393 | 111 | 504 |
| BA | 371 | 66 | 437 |
| NHBA | 353 | 57 | 410 |
| TOM | 170 | 178 | 348 |
| NHTOM | 153 | 164 | 317 |
| AAC | 101 | 107 | 208 |
| NHAAC | 95 | 100 | 195 |
| AA | 74 | 83 | 157 |
| NHAA | 71 | 79 | 150 |
| HIAC | 60 | 30 | 90 |
| HIA | 47 | 22 | 69 |
| HBAC | 22 | 12 | 34 |
| HTOM | 17 | 14 | 31 |
| NAC | 15 | 14 | 29 |
| HBA | 18 | 9 | 27 |
| NHNAC | 11 | 13 | 24 |
| HAAC | 6 | 7 | 13 |
| NA | 5 | 4 | 9 |
| HAA | 3 | 4 | 7 |
| NHNA | 2 | 4 | 6 |
| HNAC | 4 | 1 | 5 |
| HNA | 3 | 0 | 3 |
• Lincoln County population
38.5 mi, 
60°
• Union County
39.2 mi, 
108°
• Clay County
21.5 mi, 106°
• Cedar County
28.6 mi, 
166°
• Knox County
36.2 mi, 
224°
• Turner County
24.1 mi, 
29°
• Hutchinson County
29.2 mi, 
321°
• Bon Homme County
25.1 mi, 
266°
• Dixon County
45 mi, 
143°
• McCook County
46.5 mi, 
1°
[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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