Census Data Released

May 2019 - The (July 1, 2018) City census population estimate released. 

Polk County population is estimated at 487,204

on pace for 500K in 2020.  Polk  population is +56,564 since 2010


The 8-year population increase of +56,564 is greater than the individual total population of the 89 smallest counties.   The increase also represents 51.5% of the State of Iowa’s increase in population during the past 8 years.

  • Dallas County  +24,045
  • Johnson County +20,378
  • Linn County +14,683

American Community Survey

Latest demographic and housing information for Polk County, Iowa.  US Census released the ACS results on December 7,2017 (2016 - 5 year estimates)

Population / Race

Economic / Income

School Enrollment

Earnings / Education


Population / Age

Additional datsets available on American FactFinder