Last official estimated population of Union County was 14,480 (year 2014)[1]. This was 0.005% of total US population and 1.7% of total South Dakota state population. Area of Union County is 467.1 mi² (=1209.9 km²), in this year population density was 31.00 p/mi². If population growth rate would be same as in period 2010-2014 (+0.14%/yr), Union County population in 2025 would be 14,705 [0].
Historical population of Union 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] +6.87 %/yr
[1880-1890] +2.97 %/yr
[1890-1900] +2.02 %/yr
[1900-1910] -0.44 %/yr
[1910-1920] +0.39 %/yr
[1920-1930] +0.34 %/yr
[1930-1940] +0.17 %/yr
[1940-1950] -0.78 %/yr
[1950-1960] -0.57 %/yr
[1960-1970] -0.56 %/yr
[1970-1980] +1.27 %/yr
[1980-1990] -0.71 %/yr
[1990-2000] +2.13 %/yr
[2000-2005] +0.84 %/yr
[2005-2010] +1.88 %/yr
[2010-2014] +0.14 %/yr
Looking for settlements in Union County? Visit this page: Settlements in Union County, SD
Population of Union County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 495 | 417 | 912 |
| 5 to 9 | 562 | 510 | 1,072 |
| 10 to 14 | 562 | 566 | 1,128 |
| 15 to 19 | 553 | 491 | 1,044 |
| 20 to 24 | 425 | 383 | 808 |
| 25 to 29 | 391 | 354 | 745 |
| 30 to 34 | 461 | 443 | 904 |
| 35 to 39 | 422 | 474 | 896 |
| 40 to 44 | 463 | 459 | 922 |
| 45 to 49 | 535 | 474 | 1,009 |
| 50 to 54 | 540 | 555 | 1,095 |
| 55 to 59 | 550 | 530 | 1,080 |
| 60 to 64 | 557 | 527 | 1,084 |
| 65 to 69 | 394 | 388 | 782 |
| 70 to 74 | 262 | 272 | 534 |
| 75 to 79 | 165 | 195 | 360 |
| 80 to 84 | 129 | 182 | 311 |
| 85+ | 134 | 209 | 343 |
Union 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 |
| WAC | 7367 | 7211 | 14,578 |
| NH | 7342 | 7202 | 14,544 |
| WA | 7246 | 7116 | 14,362 |
| NHWAC | 7126 | 6995 | 14,121 |
| NHWA | 7025 | 6903 | 13,928 |
| H | 258 | 227 | 485 |
| HWAC | 241 | 216 | 457 |
| HWA | 221 | 213 | 434 |
| IAC | 124 | 111 | 235 |
| TOM | 125 | 102 | 227 |
| BAC | 131 | 87 | 218 |
| AAC | 101 | 112 | 213 |
| NHAAC | 95 | 112 | 207 |
| NHIAC | 104 | 102 | 206 |
| NHTOM | 104 | 99 | 203 |
| NHBAC | 119 | 82 | 201 |
| BA | 100 | 60 | 160 |
| AA | 72 | 87 | 159 |
| NHAA | 71 | 87 | 158 |
| NHBA | 92 | 57 | 149 |
| IA | 52 | 56 | 108 |
| NHIA | 45 | 48 | 93 |
| HIAC | 20 | 9 | 29 |
| NAC | 11 | 15 | 26 |
| HTOM | 21 | 3 | 24 |
| NHNAC | 9 | 15 | 24 |
| HBAC | 12 | 5 | 17 |
| HIA | 7 | 8 | 15 |
| NA | 5 | 8 | 13 |
| NHNA | 5 | 8 | 13 |
| HBA | 8 | 3 | 11 |
| HAAC | 6 | 0 | 6 |
| HNAC | 2 | 0 | 2 |
| HAA | 1 | 0 | 1 |
| HNA | 0 | 0 | 0 |
• Woodbury County population
42.9 mi, 
134°
• Lincoln County
31.2 mi, 
353°
• Sioux County
29.6 mi, 
53°
• Plymouth County
23 mi, 
106°
• Yankton County
39.2 mi, 
288°
• Dakota County
30.7 mi, 
171°
• Clay County
17.7 mi, 289°
• Cedar County
34.5 mi, 
243°
• Turner County
41.5 mi, 
322°
• Dixon County
26.1 mi, 
203°
[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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