Last official estimated population of Fayette County was 20,860 (year 2014)[1]. This was 0.007% of total US population and 0.7% of total Iowa state population. Area of Fayette County is 731.3 mi² (=1894.1 km²), in this year population density was 28.52 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Fayette County population in 2025 would be 20,805 [0].
Historical population of Fayette County for period 1850-2014 [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
[1850-1860] +30.78 %/yr
[1860-1870] +3.47 %/yr
[1870-1880] +2.75 %/yr
[1880-1890] +0.39 %/yr
[1890-1900] +2.58 %/yr
[1900-1910] -0.66 %/yr
[1910-1920] +0.47 %/yr
[1920-1930] -0.04 %/yr
[1930-1940] +0 %/yr
[1940-1950] -0.3 %/yr
[1950-1960] +0.1 %/yr
[1960-1970] -0.61 %/yr
[1970-1980] -0.54 %/yr
[1980-1990] -1.53 %/yr
[1990-2000] +0.08 %/yr
[2000-2005] -0.55 %/yr
[2005-2010] -0.51 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Fayette County? Visit this page: Settlements in Fayette County, IA
Population of Fayette County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 612 | 575 | 1,187 |
| 5 to 9 | 654 | 555 | 1,209 |
| 10 to 14 | 547 | 592 | 1,139 |
| 15 to 19 | 795 | 678 | 1,473 |
| 20 to 24 | 707 | 640 | 1,347 |
| 25 to 29 | 549 | 493 | 1,042 |
| 30 to 34 | 531 | 502 | 1,033 |
| 35 to 39 | 517 | 496 | 1,013 |
| 40 to 44 | 506 | 492 | 998 |
| 45 to 49 | 643 | 593 | 1,236 |
| 50 to 54 | 814 | 734 | 1,548 |
| 55 to 59 | 835 | 779 | 1,614 |
| 60 to 64 | 679 | 677 | 1,356 |
| 65 to 69 | 550 | 583 | 1,133 |
| 70 to 74 | 424 | 513 | 937 |
| 75 to 79 | 361 | 465 | 826 |
| 80 to 84 | 253 | 344 | 597 |
| 85+ | 206 | 449 | 655 |
Fayette 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 | 9940 | 9950 | 19,890 |
| WAC | 9904 | 9970 | 19,874 |
| WA | 9777 | 9884 | 19,661 |
| NHWAC | 9675 | 9770 | 19,445 |
| NHWA | 9553 | 9689 | 19,242 |
| H | 243 | 210 | 453 |
| HWAC | 229 | 200 | 429 |
| HWA | 224 | 195 | 419 |
| BAC | 258 | 123 | 381 |
| NHBAC | 249 | 119 | 368 |
| BA | 179 | 68 | 247 |
| NHBA | 173 | 66 | 239 |
| TOM | 133 | 89 | 222 |
| NHTOM | 128 | 84 | 212 |
| AAC | 91 | 108 | 199 |
| NHAAC | 87 | 103 | 190 |
| AA | 69 | 96 | 165 |
| NHAA | 65 | 92 | 157 |
| IAC | 56 | 42 | 98 |
| NHIAC | 50 | 36 | 86 |
| IA | 20 | 15 | 35 |
| NHIA | 16 | 11 | 27 |
| NAC | 9 | 10 | 19 |
| NHNAC | 9 | 10 | 19 |
| HBAC | 9 | 4 | 13 |
| NA | 5 | 8 | 13 |
| NHNA | 5 | 8 | 13 |
| HIAC | 6 | 6 | 12 |
| HTOM | 5 | 5 | 10 |
| HAAC | 4 | 5 | 9 |
| HBA | 6 | 2 | 8 |
| HIA | 4 | 4 | 8 |
| HAA | 4 | 4 | 8 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Black Hawk County population
36.1 mi, 
221°
• Bremer County
25.3 mi, 
256°
• Winneshiek County
29.6 mi, 
358°
• Buchanan County
27.2 mi, 
179°
• Clayton County
26.2 mi, 
93°
• Delaware County
36.2 mi, 
138°
• Butler County
48.5 mi, 259°
• Allamakee County
36.6 mi, 
39°
• Chickasaw County
27.6 mi, 
299°
• Howard County
42.3 mi, 
324°
[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
*Clayton Iowa Notes
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