Last official estimated population of Clay County was 13,846 (year 2014)[1]. This was 0.004% of total US population and 1.6% of total South Dakota state population. Area of Clay County is 417.2 mi² (=1080.6 km²), in this year population density was 33.19 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Clay County population in 2024 would be 13,801 [0].
Historical population of Clay 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] +6.67 %/yr
[1880-1890] +4.15 %/yr
[1890-1900] +2.18 %/yr
[1900-1910] -0.67 %/yr
[1910-1920] +1.03 %/yr
[1920-1930] +0.44 %/yr
[1930-1940] -0.5 %/yr
[1940-1950] +1.37 %/yr
[1950-1960] -0.17 %/yr
[1960-1970] +1.8 %/yr
[1970-1980] +0.58 %/yr
[1980-1990] -0.37 %/yr
[1990-2000] +0.26 %/yr
[2000-2005] -0.03 %/yr
[2005-2010] +0.51 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Clay County? Visit this page: Settlements in Clay County, SD
Population of Clay County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 413 | 381 | 794 |
| 5 to 9 | 359 | 324 | 683 |
| 10 to 14 | 313 | 352 | 665 |
| 15 to 19 | 717 | 917 | 1,634 |
| 20 to 24 | 1542 | 1587 | 3,129 |
| 25 to 29 | 520 | 448 | 968 |
| 30 to 34 | 400 | 369 | 769 |
| 35 to 39 | 312 | 310 | 622 |
| 40 to 44 | 289 | 266 | 555 |
| 45 to 49 | 293 | 310 | 603 |
| 50 to 54 | 304 | 329 | 633 |
| 55 to 59 | 354 | 319 | 673 |
| 60 to 64 | 339 | 308 | 647 |
| 65 to 69 | 270 | 221 | 491 |
| 70 to 74 | 175 | 171 | 346 |
| 75 to 79 | 113 | 152 | 265 |
| 80 to 84 | 79 | 123 | 202 |
| 85+ | 73 | 180 | 253 |
Clay 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 | 6675 | 6869 | 13,544 |
| WAC | 6377 | 6566 | 12,943 |
| WA | 6242 | 6423 | 12,665 |
| NHWAC | 6217 | 6401 | 12,618 |
| NHWA | 6095 | 6270 | 12,365 |
| IAC | 265 | 332 | 597 |
| NHIAC | 235 | 299 | 534 |
| IA | 179 | 244 | 423 |
| H | 190 | 198 | 388 |
| NHIA | 161 | 223 | 384 |
| AAC | 175 | 178 | 353 |
| NHAAC | 175 | 172 | 347 |
| BAC | 197 | 146 | 343 |
| HWAC | 160 | 165 | 325 |
| NHBAC | 184 | 138 | 322 |
| TOM | 153 | 155 | 308 |
| HWA | 147 | 153 | 300 |
| AA | 148 | 151 | 299 |
| NHAA | 148 | 147 | 295 |
| NHTOM | 137 | 139 | 276 |
| BA | 140 | 89 | 229 |
| NHBA | 132 | 87 | 219 |
| HIAC | 30 | 33 | 63 |
| HIA | 18 | 21 | 39 |
| HTOM | 16 | 16 | 32 |
| NAC | 13 | 10 | 23 |
| HBAC | 13 | 8 | 21 |
| NHNAC | 10 | 7 | 17 |
| HBA | 8 | 2 | 10 |
| NA | 3 | 5 | 8 |
| HNAC | 3 | 3 | 6 |
| HAAC | 0 | 6 | 6 |
| NHNA | 2 | 3 | 5 |
| HAA | 0 | 4 | 4 |
| HNA | 1 | 2 | 3 |
• Lincoln County population
28.3 mi, 
27°
• Sioux County
42.1 mi, 
74°
• Plymouth County
40.7 mi, 
107°
• Yankton County
21.5 mi, 
286°
• Dakota County
42 mi, 
149°
• Union County
17.7 mi, 109°
• Cedar County
25.7 mi, 
213°
• Turner County
28.4 mi, 
342°
• Bon Homme County
46 mi, 
276°
• Dixon County
30.4 mi, 
168°
[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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