Last official estimated population of Clay County was 16,624 (year 2014)[1]. This was 0.005% of total US population and 0.5% of total Iowa state population. Area of Clay County is 572.6 mi² (=1483 km²), in this year population density was 29.03 p/mi². If population growth rate would be same as in period 2010-2014 (-0.06%/yr), Clay County population in 2025 would be 16,506 [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] +40.17 %/yr
[1870-1880] +10.8 %/yr
[1880-1890] +8.16 %/yr
[1890-1900] +3.71 %/yr
[1900-1910] -0.48 %/yr
[1910-1920] +2.06 %/yr
[1920-1930] +0.28 %/yr
[1930-1940] +0.98 %/yr
[1940-1950] +0.19 %/yr
[1950-1960] +0.22 %/yr
[1960-1970] -0.02 %/yr
[1970-1980] +0.59 %/yr
[1980-1990] -1.07 %/yr
[1990-2000] -0.12 %/yr
[2000-2005] -0.61 %/yr
[2005-2010] -0.22 %/yr
[2010-2014] -0.06 %/yr
Looking for settlements in Clay County? Visit this page: Settlements in Clay County, IA
Population of Clay County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 485 | 455 | 940 |
| 5 to 9 | 555 | 547 | 1,102 |
| 10 to 14 | 519 | 553 | 1,072 |
| 15 to 19 | 513 | 475 | 988 |
| 20 to 24 | 489 | 421 | 910 |
| 25 to 29 | 439 | 416 | 855 |
| 30 to 34 | 500 | 483 | 983 |
| 35 to 39 | 496 | 507 | 1,003 |
| 40 to 44 | 448 | 430 | 878 |
| 45 to 49 | 483 | 452 | 935 |
| 50 to 54 | 584 | 618 | 1,202 |
| 55 to 59 | 641 | 653 | 1,294 |
| 60 to 64 | 565 | 558 | 1,123 |
| 65 to 69 | 434 | 445 | 879 |
| 70 to 74 | 315 | 379 | 694 |
| 75 to 79 | 249 | 299 | 548 |
| 80 to 84 | 191 | 275 | 466 |
| 85+ | 199 | 444 | 643 |
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 | 7951 | 8274 | 16,225 |
| WA | 7864 | 8209 | 16,073 |
| NH | 7822 | 8164 | 15,986 |
| NHWAC | 7677 | 8042 | 15,719 |
| NHWA | 7594 | 7981 | 15,575 |
| H | 283 | 246 | 529 |
| HWAC | 274 | 232 | 506 |
| HWA | 270 | 228 | 498 |
| BAC | 117 | 95 | 212 |
| NHBAC | 109 | 85 | 194 |
| TOM | 90 | 70 | 160 |
| NHTOM | 86 | 66 | 152 |
| AAC | 80 | 68 | 148 |
| NHAAC | 78 | 63 | 141 |
| BA | 67 | 53 | 120 |
| AA | 60 | 54 | 114 |
| NHBA | 63 | 45 | 108 |
| NHAA | 58 | 50 | 108 |
| IAC | 46 | 45 | 91 |
| NHIAC | 43 | 41 | 84 |
| IA | 23 | 24 | 47 |
| NHIA | 21 | 22 | 43 |
| HBAC | 8 | 10 | 18 |
| HBA | 4 | 8 | 12 |
| NAC | 6 | 2 | 8 |
| HTOM | 4 | 4 | 8 |
| NHNAC | 5 | 2 | 7 |
| HIAC | 3 | 4 | 7 |
| HAAC | 2 | 5 | 7 |
| HAA | 2 | 4 | 6 |
| HIA | 2 | 2 | 4 |
| HNAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| NHNA | 0 | 0 | 0 |
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[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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