Last official estimated population of Winnebago County was 10,828 (year 2014)[1]. This was 0.003% of total US population and 0.3% of total Iowa state population. Area of Winnebago County is 401.7 mi² (=1040.4 km²), in this year population density was 26.95 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Winnebago County population in 2026 would be 10,715 [0].
Historical population of Winnebago 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] +24.98 %/yr
[1870-1880] +12.15 %/yr
[1880-1890] +4.07 %/yr
[1890-1900] +5.68 %/yr
[1900-1910] -0.66 %/yr
[1910-1920] +1.25 %/yr
[1920-1930] -0.26 %/yr
[1930-1940] +0.61 %/yr
[1940-1950] -0.38 %/yr
[1950-1960] -0.26 %/yr
[1960-1970] -0.08 %/yr
[1970-1980] +0.02 %/yr
[1980-1990] -0.7 %/yr
[1990-2000] -0.34 %/yr
[2000-2005] -0.65 %/yr
[2005-2010] -0.85 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Winnebago County? Visit this page: Settlements in Winnebago County, IA
Population of Winnebago County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 232 | 319 | 551 |
| 5 to 9 | 301 | 331 | 632 |
| 10 to 14 | 320 | 347 | 667 |
| 15 to 19 | 394 | 317 | 711 |
| 20 to 24 | 368 | 290 | 658 |
| 25 to 29 | 258 | 293 | 551 |
| 30 to 34 | 303 | 256 | 559 |
| 35 to 39 | 252 | 255 | 507 |
| 40 to 44 | 286 | 305 | 591 |
| 45 to 49 | 295 | 279 | 574 |
| 50 to 54 | 384 | 381 | 765 |
| 55 to 59 | 418 | 423 | 841 |
| 60 to 64 | 418 | 377 | 795 |
| 65 to 69 | 276 | 269 | 545 |
| 70 to 74 | 201 | 256 | 457 |
| 75 to 79 | 160 | 223 | 383 |
| 80 to 84 | 135 | 199 | 334 |
| 85+ | 129 | 309 | 438 |
Winnebago 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 | 4985 | 5282 | 10,267 |
| NH | 4924 | 5221 | 10,145 |
| WA | 4917 | 5220 | 10,137 |
| NHWAC | 4791 | 5105 | 9,896 |
| NHWA | 4727 | 5045 | 9,772 |
| H | 206 | 208 | 414 |
| HWAC | 194 | 177 | 371 |
| HWA | 190 | 175 | 365 |
| BAC | 130 | 98 | 228 |
| NHBAC | 118 | 82 | 200 |
| BA | 88 | 63 | 151 |
| AAC | 60 | 81 | 141 |
| TOM | 69 | 64 | 133 |
| NHAAC | 58 | 73 | 131 |
| NHBA | 78 | 49 | 127 |
| NHTOM | 65 | 62 | 127 |
| AA | 46 | 62 | 108 |
| NHAA | 45 | 54 | 99 |
| IAC | 27 | 30 | 57 |
| NHIAC | 25 | 22 | 47 |
| HBAC | 12 | 16 | 28 |
| IA | 10 | 18 | 28 |
| HBA | 10 | 14 | 24 |
| NHIA | 9 | 10 | 19 |
| HIAC | 2 | 8 | 10 |
| HAAC | 2 | 8 | 10 |
| HIA | 1 | 8 | 9 |
| HAA | 1 | 8 | 9 |
| HTOM | 4 | 2 | 6 |
| NAC | 2 | 4 | 6 |
| NHNAC | 2 | 3 | 5 |
| NA | 0 | 2 | 2 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
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130°
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28.4 mi,
43°
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44.8 mi,
297°
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44.9 mi,
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26.3 mi,
244°
• Faribault County
23 mi,
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• Wright County
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• Hancock County
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• Emmet County
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24.9 mi,
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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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