Polk County Population 2018

Polk County's estimated population is 481,830 with a growth rate of 1.49% in the past year according to the most recent United States census data. Polk County is the 1st largest county in Iowa.

Year Population Growth Growth Rate
2017481,8307,0621.49%
2016474,7687,5161.61%
2015467,2526,9591.51%
2014460,2938,2611.83%
2013452,0327,7301.74%
2012444,3026,1651.41%
2011438,1375,9141.37%
2010432,223105,08332.12%
1990327,14023,9707.91%
1980303,17017,0695.97%
1970286,10119,7867.43%
1960266,31540,30517.83%
1950226,01030,17515.41%
1940195,83522,99813.31%
1930172,83718,80812.21%
1920154,02943,59139.47%
1910110,43827,81433.66%
190082,62417,21426.32%
189065,41023,01554.29%
188042,39514,53852.19%
187027,85716,232139.63%
186011,6257,112157.59%
18504,5130.00%

Polk County Population Growth

Population Data via

Polk County Race Data

Race Population Percentage
White401,68383.37%
Black or African American31,4286.52%
Asian20,6634.29%
Two or More Races10,6392.21%
American Indian and Alaska Native1,9210.40%
Native Hawaiian and Other Pacific Islander3540.07%

Polk County Population Pyramid

0k5k10k15k20k Male Population0k5k10k15k20k Female Population8580757065605550454035302520151050
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990