Last official estimated population of Clay County was 26,870 (year 2014)[1]. This was 0.008% of total US population and 0.4% of total Indiana state population. Area of Clay County is 360.3 mi² (=933.2 km²), in this year population density was 74.57 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Clay County population in 2025 would be 26,815 [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] +13.17 %/yr
[1840-1850] +3.62 %/yr
[1850-1860] +4.35 %/yr
[1860-1870] +4.61 %/yr
[1870-1880] +3.08 %/yr
[1880-1890] +1.68 %/yr
[1890-1900] +1.16 %/yr
[1900-1910] -0.52 %/yr
[1910-1920] -0.99 %/yr
[1920-1930] -1.06 %/yr
[1930-1940] -0.43 %/yr
[1940-1950] -0.59 %/yr
[1950-1960] +0.12 %/yr
[1960-1970] -0.11 %/yr
[1970-1980] +0.38 %/yr
[1980-1990] -0.06 %/yr
[1990-2000] +0.73 %/yr
[2000-2005] +0.4 %/yr
[2005-2010] -0.15 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Clay County? Visit this page: Settlements in Clay County, IN
Population of Clay County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 832 | 791 | 1,623 |
| 5 to 9 | 844 | 796 | 1,640 |
| 10 to 14 | 859 | 888 | 1,747 |
| 15 to 19 | 881 | 847 | 1,728 |
| 20 to 24 | 769 | 774 | 1,543 |
| 25 to 29 | 770 | 753 | 1,523 |
| 30 to 34 | 816 | 795 | 1,611 |
| 35 to 39 | 768 | 803 | 1,571 |
| 40 to 44 | 859 | 860 | 1,719 |
| 45 to 49 | 849 | 844 | 1,693 |
| 50 to 54 | 1008 | 960 | 1,968 |
| 55 to 59 | 1009 | 1021 | 2,030 |
| 60 to 64 | 857 | 889 | 1,746 |
| 65 to 69 | 705 | 712 | 1,417 |
| 70 to 74 | 479 | 576 | 1,055 |
| 75 to 79 | 328 | 456 | 784 |
| 80 to 84 | 255 | 359 | 614 |
| 85+ | 188 | 362 | 550 |
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 | 12897 | 13309 | 26,206 |
| WAC | 12894 | 13312 | 26,206 |
| WA | 12774 | 13185 | 25,959 |
| NHWAC | 12724 | 13141 | 25,865 |
| NHWA | 12613 | 13021 | 25,634 |
| H | 179 | 177 | 356 |
| HWAC | 170 | 171 | 341 |
| HWA | 161 | 164 | 325 |
| BAC | 152 | 129 | 281 |
| NHBAC | 140 | 121 | 261 |
| TOM | 123 | 135 | 258 |
| NHTOM | 112 | 128 | 240 |
| IAC | 93 | 80 | 173 |
| NHIAC | 89 | 76 | 165 |
| BA | 95 | 62 | 157 |
| AAC | 55 | 94 | 149 |
| NHBA | 90 | 58 | 148 |
| NHAAC | 52 | 92 | 144 |
| AA | 35 | 73 | 108 |
| NHAA | 35 | 73 | 108 |
| IA | 43 | 27 | 70 |
| NHIA | 41 | 25 | 66 |
| HBAC | 12 | 8 | 20 |
| NAC | 9 | 10 | 19 |
| HTOM | 11 | 7 | 18 |
| NHNAC | 8 | 10 | 18 |
| NHNA | 6 | 4 | 10 |
| NA | 6 | 4 | 10 |
| HBA | 5 | 4 | 9 |
| HIAC | 4 | 4 | 8 |
| HAAC | 3 | 2 | 5 |
| HIA | 2 | 2 | 4 |
| HNAC | 1 | 0 | 1 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Monroe County population
35.5 mi, 
116°
• Vigo County
14.9 mi, 
279°
• Morgan County
36.2 mi, 
80°
• Putnam County
23.4 mi, 
36°
• Greene County
24.7 mi, 
166°
• Owen County
15.7 mi, 
109°
• Sullivan County
26.5 mi, 
217°
• Parke County
26.6 mi, 
350°
• Clark County
36.4 mi, 
263°
• Vermillion County
36.7 mi, 
329°
[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
*Owen, Vigo, Sullivan Indiana Notes
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