Last official estimated population of Polk County was 432,243 (year 2014)[1]. This was 0.136% of total US population and 13.8% of total Iowa state population. Area of Polk County is 591.5 mi² (=1532.1 km²), in this year population density was 730.72 p/mi². If population growth rate would be same as in period 2010-2014 (+0.09%/yr), Polk County population in 2024 would be 436,277 [0].
Historical population of Polk 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] +9.92 %/yr
[1860-1870] +9.13 %/yr
[1870-1880] +4.29 %/yr
[1880-1890] +4.43 %/yr
[1890-1900] +2.36 %/yr
[1900-1910] +2.94 %/yr
[1910-1920] +3.38 %/yr
[1920-1930] +1.16 %/yr
[1930-1940] +1.26 %/yr
[1940-1950] +1.44 %/yr
[1950-1960] +1.65 %/yr
[1960-1970] +0.72 %/yr
[1970-1980] +0.58 %/yr
[1980-1990] +0.76 %/yr
[1990-2000] +1.35 %/yr
[2000-2005] +1.29 %/yr
[2005-2010] +1.54 %/yr
[2010-2014] +0.09 %/yr
Looking for settlements in Polk County? Visit this page: Settlements in Polk County, IA
Population of Polk County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 17044 | 16220 | 33,264 |
| 5 to 9 | 16856 | 16207 | 33,063 |
| 10 to 14 | 16068 | 15409 | 31,477 |
| 15 to 19 | 14888 | 14297 | 29,185 |
| 20 to 24 | 14747 | 15467 | 30,214 |
| 25 to 29 | 17701 | 18082 | 35,783 |
| 30 to 34 | 18468 | 18173 | 36,641 |
| 35 to 39 | 15909 | 15679 | 31,588 |
| 40 to 44 | 15248 | 15108 | 30,356 |
| 45 to 49 | 15104 | 14947 | 30,051 |
| 50 to 54 | 15565 | 15913 | 31,478 |
| 55 to 59 | 13838 | 14717 | 28,555 |
| 60 to 64 | 11729 | 12753 | 24,482 |
| 65 to 69 | 8717 | 9868 | 18,585 |
| 70 to 74 | 5630 | 6800 | 12,430 |
| 75 to 79 | 3808 | 4946 | 8,754 |
| 80 to 84 | 2559 | 3943 | 6,502 |
| 85+ | 2383 | 5071 | 7,454 |
Polk 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 | 207032 | 215836 | 422,868 |
| WAC | 199705 | 207464 | 407,169 |
| WA | 195011 | 202730 | 397,741 |
| NHWAC | 181793 | 190887 | 372,680 |
| NHWA | 177520 | 186661 | 364,181 |
| H | 19230 | 17764 | 36,994 |
| BAC | 18503 | 18004 | 36,507 |
| NHBAC | 17676 | 17220 | 34,896 |
| HWAC | 17912 | 16577 | 34,489 |
| HWA | 17491 | 16069 | 33,560 |
| BA | 15544 | 15111 | 30,655 |
| NHBA | 14976 | 14617 | 29,593 |
| AAC | 11021 | 11002 | 22,023 |
| NHAAC | 10823 | 10800 | 21,623 |
| AA | 9571 | 9525 | 19,096 |
| NHAA | 9460 | 9434 | 18,894 |
| TOM | 5067 | 5094 | 10,161 |
| NHTOM | 4582 | 4507 | 9,089 |
| IAC | 2098 | 2240 | 4,338 |
| NHIAC | 1339 | 1471 | 2,810 |
| IA | 925 | 975 | 1,900 |
| HBAC | 827 | 784 | 1,611 |
| HIAC | 759 | 769 | 1,528 |
| HTOM | 485 | 587 | 1,072 |
| HBA | 568 | 494 | 1,062 |
| HIA | 535 | 482 | 1,017 |
| NHIA | 390 | 493 | 883 |
| NAC | 325 | 340 | 665 |
| NHNAC | 254 | 257 | 511 |
| HAAC | 198 | 202 | 400 |
| NA | 144 | 165 | 309 |
| NHNA | 104 | 124 | 228 |
| HAA | 111 | 91 | 202 |
| HNAC | 71 | 83 | 154 |
| HNA | 40 | 41 | 81 |
• Story County population
24.9 mi, 
12°
• Dallas County
24.3 mi, 
270°
• Warren County
24 mi, 
179°
• Marshall County
39 mi, 
50°
• Jasper County
26.6 mi, 
89°
• Marion County
34.6 mi, 
134°
• Boone County
31 mi, 
322°
• Madison County
33.6 mi, 
223°
• Clarke County
46.7 mi, 
193°
• Lucas County
46.7 mi, 
164°
[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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