Last official estimated population of Wapello County was 35,652 (year 2014)[1]. This was 0.011% of total US population and 1.1% of total Iowa state population. Area of Wapello County is 436.0 mi² (=1129.3 km²), in this year population density was 81.77 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Wapello County population in 2026 would be 35,733 [0].
Historical population of Wapello 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] +5.54 %/yr
[1860-1870] +4.41 %/yr
[1870-1880] +1.24 %/yr
[1880-1890] +1.87 %/yr
[1890-1900] +1.53 %/yr
[1900-1910] +0.64 %/yr
[1910-1920] +0.05 %/yr
[1920-1930] +0.65 %/yr
[1930-1940] +0.9 %/yr
[1940-1950] +0.68 %/yr
[1950-1960] -0.27 %/yr
[1960-1970] -0.9 %/yr
[1970-1980] -0.46 %/yr
[1980-1990] -1.19 %/yr
[1990-2000] +0.1 %/yr
[2000-2005] -0.12 %/yr
[2005-2010] -0.13 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Wapello County? Visit this page: Settlements in Wapello County, IA
Population of Wapello County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1134 | 985 | 2,119 |
| 5 to 9 | 1144 | 1149 | 2,293 |
| 10 to 14 | 1112 | 1093 | 2,205 |
| 15 to 19 | 1141 | 1062 | 2,203 |
| 20 to 24 | 1196 | 1105 | 2,301 |
| 25 to 29 | 1143 | 1071 | 2,214 |
| 30 to 34 | 1139 | 1040 | 2,179 |
| 35 to 39 | 1003 | 986 | 1,989 |
| 40 to 44 | 1083 | 975 | 2,058 |
| 45 to 49 | 1060 | 1072 | 2,132 |
| 50 to 54 | 1238 | 1306 | 2,544 |
| 55 to 59 | 1273 | 1368 | 2,641 |
| 60 to 64 | 1160 | 1190 | 2,350 |
| 65 to 69 | 864 | 946 | 1,810 |
| 70 to 74 | 613 | 732 | 1,345 |
| 75 to 79 | 454 | 592 | 1,046 |
| 80 to 84 | 334 | 506 | 840 |
| 85+ | 317 | 626 | 943 |
Wapello 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 | 16619 | 17084 | 33,703 |
| WA | 16413 | 16840 | 33,253 |
| NH | 15585 | 16093 | 31,678 |
| NHWAC | 14949 | 15519 | 30,468 |
| NHWA | 14770 | 15301 | 30,071 |
| H | 1823 | 1711 | 3,534 |
| HWAC | 1670 | 1565 | 3,235 |
| HWA | 1643 | 1539 | 3,182 |
| BAC | 544 | 472 | 1,016 |
| NHBAC | 495 | 427 | 922 |
| BA | 434 | 347 | 781 |
| NHBA | 396 | 314 | 710 |
| TOM | 220 | 255 | 475 |
| IAC | 238 | 232 | 470 |
| AAC | 187 | 237 | 424 |
| NHTOM | 192 | 225 | 417 |
| NHAAC | 175 | 222 | 397 |
| AA | 144 | 183 | 327 |
| NHAA | 137 | 172 | 309 |
| IA | 150 | 139 | 289 |
| NHIAC | 124 | 124 | 248 |
| HIAC | 114 | 108 | 222 |
| HIA | 96 | 88 | 184 |
| NAC | 56 | 54 | 110 |
| NHIA | 54 | 51 | 105 |
| HBAC | 49 | 45 | 94 |
| NA | 47 | 40 | 87 |
| NHNAC | 45 | 41 | 86 |
| HBA | 38 | 33 | 71 |
| NHNA | 36 | 30 | 66 |
| HTOM | 28 | 30 | 58 |
| HAAC | 12 | 15 | 27 |
| HNAC | 11 | 13 | 24 |
| HNA | 11 | 10 | 21 |
| HAA | 7 | 11 | 18 |
• Marion County population
41.2 mi,
300°
• Mahaska County
23.8 mi,
330°
• Washington County
41.1 mi,
59°
• Jefferson County
23.1 mi,
94°
• Appanoose County
31.3 mi,
230°
• Keokuk County
24.2 mi,
31°
• Davis County
19.6 mi,
180°
• Monroe County
24 mi,
269°
• Van Buren County
30.6 mi,
128°
• Schuyler County
39.2 mi,
188°
[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
*Jefferson Iowa Notes
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