Last official estimated population of Cass County was 13,927 (year 2014)[1]. This was 0.004% of total US population and 0.4% of total Iowa state population. Area of Cass County is 564.9 mi² (=1463.2 km²), in this year population density was 24.65 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Cass County population in 2024 would be 13,855 [0].
Historical population of Cass 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] +12.98 %/yr
[1870-1880] +11.98 %/yr
[1880-1890] +1.49 %/yr
[1890-1900] +0.8 %/yr
[1900-1910] -1.1 %/yr
[1910-1920] +0.19 %/yr
[1920-1930] +0 %/yr
[1930-1940] -0.41 %/yr
[1940-1950] -0.06 %/yr
[1950-1960] -0.34 %/yr
[1960-1970] -0.52 %/yr
[1970-1980] -0.04 %/yr
[1980-1990] -1.12 %/yr
[1990-2000] -0.29 %/yr
[2000-2005] -0.95 %/yr
[2005-2010] -0.07 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Cass County? Visit this page: Settlements in Cass County, IA
Population of Cass County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 369 | 399 | 768 |
| 5 to 9 | 487 | 432 | 919 |
| 10 to 14 | 453 | 400 | 853 |
| 15 to 19 | 423 | 341 | 764 |
| 20 to 24 | 341 | 338 | 679 |
| 25 to 29 | 320 | 309 | 629 |
| 30 to 34 | 381 | 366 | 747 |
| 35 to 39 | 343 | 352 | 695 |
| 40 to 44 | 387 | 325 | 712 |
| 45 to 49 | 364 | 383 | 747 |
| 50 to 54 | 506 | 536 | 1,042 |
| 55 to 59 | 536 | 514 | 1,050 |
| 60 to 64 | 458 | 491 | 949 |
| 65 to 69 | 385 | 390 | 775 |
| 70 to 74 | 291 | 353 | 644 |
| 75 to 79 | 261 | 305 | 566 |
| 80 to 84 | 150 | 259 | 409 |
| 85+ | 181 | 319 | 500 |
Cass 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 | 6523 | 6706 | 13,229 |
| WA | 6468 | 6662 | 13,130 |
| NH | 6445 | 6678 | 13,123 |
| NHWAC | 6373 | 6589 | 12,962 |
| NHWA | 6326 | 6549 | 12,875 |
| H | 191 | 134 | 325 |
| HWAC | 150 | 117 | 267 |
| HWA | 142 | 113 | 255 |
| BAC | 69 | 58 | 127 |
| TOM | 60 | 45 | 105 |
| NHBAC | 49 | 51 | 100 |
| IAC | 56 | 36 | 92 |
| NHTOM | 51 | 40 | 91 |
| IA | 36 | 26 | 62 |
| BA | 34 | 27 | 61 |
| AAC | 25 | 33 | 58 |
| NHAAC | 24 | 32 | 56 |
| NAC | 25 | 28 | 53 |
| NHNAC | 25 | 26 | 51 |
| NA | 25 | 25 | 50 |
| NHNA | 25 | 25 | 50 |
| NHIAC | 26 | 23 | 49 |
| NHBA | 20 | 24 | 44 |
| HIAC | 30 | 13 | 43 |
| AA | 13 | 27 | 40 |
| NHAA | 13 | 26 | 39 |
| HIA | 26 | 12 | 38 |
| HBAC | 20 | 7 | 27 |
| NHIA | 10 | 14 | 24 |
| HBA | 14 | 3 | 17 |
| HTOM | 9 | 5 | 14 |
| HAAC | 1 | 1 | 2 |
| HNAC | 0 | 2 | 2 |
| HAA | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Pottawattamie County population
31.7 mi, 
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42.5 mi, 
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41.2 mi, 
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41.5 mi, 
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• Shelby County
30.8 mi, 
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• Guthrie County
32.9 mi, 
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• Adair County
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• Audubon County
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• Adams County
24.8 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
*Pottawattamie Iowa Notes
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