Last official estimated population of Winneshiek County was 21,066 (year 2014)[1]. This was 0.007% of total US population and 0.7% of total Iowa state population. Area of Winneshiek County is 690.1 mi² (=1787.5 km²), in this year population density was 30.52 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Winneshiek County population in 2026 would be 21,096 [0].
Historical population of Winneshiek 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] +38.27 %/yr
[1860-1870] +5.39 %/yr
[1870-1880] +0.16 %/yr
[1880-1890] -0.61 %/yr
[1890-1900] +0.52 %/yr
[1900-1910] -0.88 %/yr
[1910-1920] +0.17 %/yr
[1920-1930] -0.21 %/yr
[1930-1940] +0.29 %/yr
[1940-1950] -0.28 %/yr
[1950-1960] +0.01 %/yr
[1960-1970] +0.05 %/yr
[1970-1980] +0.05 %/yr
[1980-1990] -0.48 %/yr
[1990-2000] +0.21 %/yr
[2000-2005] -0.22 %/yr
[2005-2010] -0 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Winneshiek County? Visit this page: Settlements in Winneshiek County, IA
Population of Winneshiek County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 450 | 444 | 894 |
| 5 to 9 | 573 | 579 | 1,152 |
| 10 to 14 | 613 | 543 | 1,156 |
| 15 to 19 | 929 | 1024 | 1,953 |
| 20 to 24 | 1057 | 1120 | 2,177 |
| 25 to 29 | 522 | 462 | 984 |
| 30 to 34 | 524 | 505 | 1,029 |
| 35 to 39 | 509 | 470 | 979 |
| 40 to 44 | 494 | 489 | 983 |
| 45 to 49 | 624 | 587 | 1,211 |
| 50 to 54 | 739 | 755 | 1,494 |
| 55 to 59 | 878 | 753 | 1,631 |
| 60 to 64 | 675 | 683 | 1,358 |
| 65 to 69 | 522 | 528 | 1,050 |
| 70 to 74 | 382 | 425 | 807 |
| 75 to 79 | 313 | 380 | 693 |
| 80 to 84 | 226 | 304 | 530 |
| 85+ | 246 | 441 | 687 |
Winneshiek 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 | 10036 | 10303 | 20,339 |
| WAC | 10032 | 10276 | 20,308 |
| WA | 9953 | 10195 | 20,148 |
| NHWAC | 9809 | 10099 | 19,908 |
| NHWA | 9740 | 10032 | 19,772 |
| H | 240 | 189 | 429 |
| HWAC | 223 | 177 | 400 |
| HWA | 213 | 163 | 376 |
| AAC | 143 | 157 | 300 |
| NHAAC | 136 | 150 | 286 |
| AA | 122 | 129 | 251 |
| BAC | 138 | 108 | 246 |
| NHAA | 115 | 125 | 240 |
| NHBAC | 129 | 97 | 226 |
| BA | 100 | 71 | 171 |
| TOM | 81 | 86 | 167 |
| NHBA | 94 | 66 | 160 |
| NHTOM | 71 | 71 | 142 |
| IAC | 43 | 38 | 81 |
| NHIAC | 32 | 28 | 60 |
| IA | 17 | 9 | 26 |
| HTOM | 10 | 15 | 25 |
| NHIA | 14 | 8 | 22 |
| HIAC | 11 | 10 | 21 |
| HBAC | 9 | 11 | 20 |
| HAAC | 7 | 7 | 14 |
| HAA | 7 | 4 | 11 |
| NAC | 6 | 5 | 11 |
| HBA | 6 | 5 | 11 |
| NHNAC | 5 | 3 | 8 |
| NA | 3 | 2 | 5 |
| HIA | 3 | 1 | 4 |
| NHNA | 2 | 1 | 3 |
| HNAC | 1 | 2 | 3 |
| HNA | 1 | 1 | 2 |
• Bremer County population
42.8 mi, 
214°
• Fayette County
29.6 mi, 
178°
• Fillmore County
29.3 mi, 
335°
• Houston County
31.2 mi, 
34°
• Clayton County
41 mi, 
139°
• Crawford County
45.4 mi, 
93°
• Allamakee County
23.6 mi, 93°
• Chickasaw County
28.5 mi, 
235°
• Mitchell County
47.1 mi, 
274°
• Howard County
24.2 mi, 
281°
[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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