Last official estimated population of Clayton County was 18,090 (year 2014)[1]. This was 0.006% of total US population and 0.6% of total Iowa state population. Area of Clayton County is 792.7 mi² (=2053 km²), in this year population density was 22.82 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Clayton County population in 2024 would be 17,993 [0].
Historical population of Clayton County for period 1840-2014 [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
[1840-1850] +13.4 %/yr
[1850-1860] +18.26 %/yr
[1860-1870] +2.97 %/yr
[1870-1880] +0.37 %/yr
[1880-1890] -0.75 %/yr
[1890-1900] +0.37 %/yr
[1900-1910] -0.81 %/yr
[1910-1920] -0.21 %/yr
[1920-1930] -0.19 %/yr
[1930-1940] -0.09 %/yr
[1940-1950] -0.77 %/yr
[1950-1960] -0.25 %/yr
[1960-1970] -0.64 %/yr
[1970-1980] +0.24 %/yr
[1980-1990] -1.01 %/yr
[1990-2000] -0.2 %/yr
[2000-2005] -0.43 %/yr
[2005-2010] -0.15 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Clayton County? Visit this page: Settlements in Clayton County, IA
Population of Clayton County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 501 | 502 | 1,003 |
| 5 to 9 | 572 | 525 | 1,097 |
| 10 to 14 | 564 | 549 | 1,113 |
| 15 to 19 | 578 | 495 | 1,073 |
| 20 to 24 | 476 | 429 | 905 |
| 25 to 29 | 382 | 383 | 765 |
| 30 to 34 | 481 | 439 | 920 |
| 35 to 39 | 435 | 413 | 848 |
| 40 to 44 | 502 | 446 | 948 |
| 45 to 49 | 527 | 503 | 1,030 |
| 50 to 54 | 708 | 708 | 1,416 |
| 55 to 59 | 778 | 770 | 1,548 |
| 60 to 64 | 701 | 629 | 1,330 |
| 65 to 69 | 558 | 531 | 1,089 |
| 70 to 74 | 398 | 406 | 804 |
| 75 to 79 | 301 | 355 | 656 |
| 80 to 84 | 240 | 301 | 541 |
| 85+ | 198 | 408 | 606 |
Clayton 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 | 8787 | 8675 | 17,462 |
| NH | 8714 | 8649 | 17,363 |
| WA | 8717 | 8606 | 17,323 |
| NHWAC | 8613 | 8542 | 17,155 |
| NHWA | 8544 | 8477 | 17,021 |
| H | 186 | 143 | 329 |
| HWAC | 174 | 133 | 307 |
| HWA | 173 | 129 | 302 |
| BAC | 101 | 93 | 194 |
| NHBAC | 96 | 86 | 182 |
| TOM | 73 | 76 | 149 |
| NHTOM | 72 | 72 | 144 |
| BA | 68 | 60 | 128 |
| NHBA | 64 | 56 | 120 |
| AAC | 36 | 52 | 88 |
| NHAAC | 36 | 51 | 87 |
| IAC | 40 | 39 | 79 |
| NHIAC | 33 | 33 | 66 |
| AA | 20 | 33 | 53 |
| NHAA | 20 | 32 | 52 |
| IA | 15 | 10 | 25 |
| NAC | 13 | 12 | 25 |
| NHNAC | 12 | 12 | 24 |
| NA | 7 | 7 | 14 |
| NHIA | 8 | 5 | 13 |
| HIAC | 7 | 6 | 13 |
| NHNA | 6 | 7 | 13 |
| HIA | 7 | 5 | 12 |
| HBAC | 5 | 7 | 12 |
| HBA | 4 | 4 | 8 |
| HTOM | 1 | 4 | 5 |
| HNAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| HAAC | 0 | 1 | 1 |
| HAA | 0 | 1 | 1 |
• Dubuque County population
34.5 mi, 
139°
• Grant County
31.9 mi, 
86°
• Bremer County
51 mi, 
265°
• Winneshiek County
41 mi, 
319°
• Buchanan County
36.6 mi, 
225°
• Fayette County
26.2 mi, 273°
• Jones County
50.6 mi, 
167°
• Delaware County
25.5 mi, 
184°
• Crawford County
33.9 mi, 
33°
• Allamakee County
30.1 mi, 
354°
[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 1 Iowa Notes
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