Population.us > Counties > Iowa > Polk County

Population of Polk County

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 2021 would be 435,063 [0].


Historical population

Historical population of Polk County for period 1850-2014 [1] , [2] , [3]:

Maps: Population, population density, population changes

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.

PopulationDensityChangesLegendsPosition

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Annual growth rate

[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

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Demography

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

Counties near Polk County

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°


Sources, notices

[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

Iowa Notes

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