Last official estimated population of Clay County was 13,818 (year 2014)[1]. This was 0.004% of total US population and 0.1% of total Illinois state population. Area of Clay County is 469.6 mi² (=1216.2 km²), in this year population density was 29.43 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Clay County population in 2024 would be 13,826 [0].
Historical population of Clay County for period 1830-2014 [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
[1830-1840] +15.64 %/yr
[1840-1850] +2.88 %/yr
[1850-1860] +8.09 %/yr
[1860-1870] +5.45 %/yr
[1870-1880] +0.2 %/yr
[1880-1890] +0.35 %/yr
[1890-1900] +1.55 %/yr
[1900-1910] -0.47 %/yr
[1910-1920] -0.54 %/yr
[1920-1930] -0.9 %/yr
[1930-1940] +1.61 %/yr
[1940-1950] -0.82 %/yr
[1950-1960] -0.98 %/yr
[1960-1970] -0.7 %/yr
[1970-1980] +0.37 %/yr
[1980-1990] -0.55 %/yr
[1990-2000] -0.03 %/yr
[2000-2005] -0.4 %/yr
[2005-2010] -0.46 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Clay County? Visit this page: Settlements in Clay County, IL
Population of Clay County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 464 | 421 | 885 |
| 5 to 9 | 432 | 412 | 844 |
| 10 to 14 | 440 | 424 | 864 |
| 15 to 19 | 383 | 375 | 758 |
| 20 to 24 | 417 | 410 | 827 |
| 25 to 29 | 351 | 329 | 680 |
| 30 to 34 | 381 | 401 | 782 |
| 35 to 39 | 371 | 385 | 756 |
| 40 to 44 | 419 | 364 | 783 |
| 45 to 49 | 398 | 405 | 803 |
| 50 to 54 | 540 | 523 | 1,063 |
| 55 to 59 | 512 | 487 | 999 |
| 60 to 64 | 455 | 473 | 928 |
| 65 to 69 | 389 | 401 | 790 |
| 70 to 74 | 258 | 323 | 581 |
| 75 to 79 | 195 | 246 | 441 |
| 80 to 84 | 131 | 226 | 357 |
| 85+ | 130 | 249 | 379 |
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 | 6584 | 6738 | 13,322 |
| NH | 6555 | 6766 | 13,321 |
| WA | 6518 | 6683 | 13,201 |
| NHWAC | 6482 | 6655 | 13,137 |
| NHWA | 6421 | 6600 | 13,021 |
| H | 111 | 88 | 199 |
| HWAC | 102 | 83 | 185 |
| HWA | 97 | 83 | 180 |
| BAC | 68 | 60 | 128 |
| TOM | 69 | 58 | 127 |
| NHTOM | 63 | 58 | 121 |
| NHAAC | 42 | 78 | 120 |
| AAC | 42 | 78 | 120 |
| NHBAC | 60 | 56 | 116 |
| NHAA | 29 | 64 | 93 |
| AA | 29 | 64 | 93 |
| IAC | 39 | 34 | 73 |
| BA | 35 | 32 | 67 |
| NHIAC | 32 | 33 | 65 |
| NHBA | 31 | 28 | 59 |
| IA | 15 | 17 | 32 |
| NHIA | 11 | 16 | 27 |
| HBAC | 8 | 4 | 12 |
| HIAC | 7 | 1 | 8 |
| HBA | 4 | 4 | 8 |
| HTOM | 6 | 0 | 6 |
| HIA | 4 | 1 | 5 |
| NAC | 2 | 2 | 4 |
| NHNAC | 2 | 2 | 4 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
• Marion County population
24.6 mi, 
253°
• Jefferson County
39 mi, 
217°
• Effingham County
21.6 mi, 
344°
• Fayette County
33.7 mi, 
301°
• Wayne County
21.9 mi, 
172°
• Richland County
21.5 mi, 
96°
• Wabash County
40.5 mi, 
120°
• Cumberland County
38.6 mi, 
19°
• Jasper County
25.2 mi, 
45°
• Edwards County
32.7 mi, 
134°
[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
See note 3 Illinois Notes
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