Last official estimated population of Clay County was 8,550 (year 2014)[1]. This was 0.003% of total US population and 0.3% of total Kansas state population. Area of Clay County is 655.6 mi² (=1698 km²), in this year population density was 13.04 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Clay County population in 2024 would be 8,588 [0].
Historical population of Clay County for period 1860-2014 [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
[1860-1870] +33.55 %/yr
[1870-1880] +15.4 %/yr
[1880-1890] +2.74 %/yr
[1890-1900] -0.2 %/yr
[1900-1910] -0.37 %/yr
[1910-1920] -0.6 %/yr
[1920-1930] +0.13 %/yr
[1930-1940] -0.91 %/yr
[1940-1950] -1.26 %/yr
[1950-1960] -0.91 %/yr
[1960-1970] -0.76 %/yr
[1970-1980] -0.09 %/yr
[1980-1990] -0.68 %/yr
[1990-2000] -0.35 %/yr
[2000-2005] -0.92 %/yr
[2005-2010] +0.21 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Clay County? Visit this page: Settlements in Clay County, KS
Population of Clay County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 274 | 262 | 536 |
| 5 to 9 | 276 | 270 | 546 |
| 10 to 14 | 263 | 248 | 511 |
| 15 to 19 | 271 | 246 | 517 |
| 20 to 24 | 202 | 185 | 387 |
| 25 to 29 | 232 | 186 | 418 |
| 30 to 34 | 243 | 238 | 481 |
| 35 to 39 | 251 | 240 | 491 |
| 40 to 44 | 246 | 217 | 463 |
| 45 to 49 | 229 | 231 | 460 |
| 50 to 54 | 260 | 282 | 542 |
| 55 to 59 | 293 | 288 | 581 |
| 60 to 64 | 277 | 286 | 563 |
| 65 to 69 | 255 | 271 | 526 |
| 70 to 74 | 192 | 206 | 398 |
| 75 to 79 | 142 | 167 | 309 |
| 80 to 84 | 90 | 151 | 241 |
| 85+ | 139 | 208 | 347 |
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 |
| WAC | 4057 | 4114 | 8,171 |
| NH | 4014 | 4083 | 8,097 |
| WA | 4004 | 4061 | 8,065 |
| NHWAC | 3948 | 4025 | 7,973 |
| NHWA | 3898 | 3975 | 7,873 |
| H | 121 | 99 | 220 |
| HWAC | 109 | 89 | 198 |
| HWA | 106 | 86 | 192 |
| TOM | 56 | 57 | 113 |
| NHTOM | 53 | 54 | 107 |
| IAC | 51 | 47 | 98 |
| BAC | 55 | 40 | 95 |
| NHIAC | 48 | 43 | 91 |
| NHBAC | 48 | 33 | 81 |
| NHAAC | 22 | 35 | 57 |
| AAC | 22 | 35 | 57 |
| BA | 35 | 20 | 55 |
| NHBA | 31 | 16 | 47 |
| IA | 25 | 20 | 45 |
| NHIA | 22 | 16 | 38 |
| AA | 9 | 21 | 30 |
| NHAA | 9 | 21 | 30 |
| HBAC | 7 | 7 | 14 |
| NAC | 7 | 7 | 14 |
| NA | 6 | 3 | 9 |
| HBA | 4 | 4 | 8 |
| HNAC | 5 | 2 | 7 |
| HNA | 5 | 2 | 7 |
| HIA | 3 | 4 | 7 |
| HIAC | 3 | 4 | 7 |
| NHNAC | 2 | 5 | 7 |
| HTOM | 3 | 3 | 6 |
| NHNA | 1 | 1 | 2 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Riley County population
23.9 mi, 
98°
• Saline County
46.4 mi, 
213°
• Geary County
32 mi, 
137°
• Pottawatomie County
44.5 mi, 
86°
• Dickinson County
33 mi, 
178°
• Marshall County
45.9 mi, 
48°
• Cloud County
27.1 mi, 
291°
• Ottawa County
29.7 mi, 
241°
• Washington County
30.1 mi, 
7°
• Republic County
42.2 mi, 
322°
[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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