The population of Polk county is estimated at 474,768 where 355,086 speak English exclusively and 4,681 speak primarily in another language. In 2017 there were 7,006 births and 3,464 deaths in Polk county. Polk county has 90,742 housing units that are owned with a mortgage or a loan, 26,789 that are owned free and clear and 52,666 that are renter occupied.

  The upstanding residents of Polk County filed 226,530 federal tax returns in 2017. This amount represents 15.7% of all Iowa filings and 0.152% of the entire nation. Polk had an impressive combined total federal tax liability of $2,566,593,000 on earned income of $15,965,984,000. Other notable statistics from Polk County were 10,580 unemployment claims which collected a total of $46,606,000 and 68,510 charitable contributions valued at $332,113,000. 77,750 filings from Polk County paid a combined total of $357,114,000 in property taxes and 66,580 filings paid $398,685,000 on mortgage interest costs.

  In 2010 Polk county had 402 religious congregations with an estimated 193,762 members.
35.3% of the Polk population has a college level Bachelors degree or higher. 8.6% have less than a highschool diploma level education.

Approximately 48% of Polk County voted in the presidential election of 2016. This represents an increase from the 2012 election by 857 votes.
At $66,112 the median income is 112.6% of the Iowa average. An estimated 7,964 people claimed to be unemployed last year in Polk, the equivalant of around 3.1% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 3.5%.

Top 15 Industries in Polk County.
Total # Employed	Industry Job Type
36,781	Finance and insurance
33,649	Health care and social assistance
27,663	Retail trade
27,390	Administrative and support and waste management and remediation services
26,910	Administrative and support services
20,540	Accommodation and food services
19,728	Insurance carriers
18,213	Food services and drinking places
17,594	Employment services
16,660	Manufacturing
16,407	Restaurants and other eating places
14,140	Professional, scientific, and technical services
11,694	Ambulatory health care services
11,409	Wholesale trade
10,007	Transportation and warehousing

In 2018 the average price reduction was 2.60% in Polk County (averaging across 18 zip codes a sample of which are; 50322, 50313, 50315, 50316 and 50310).

In 2018 13.12% of listings in Polk County (averaging across 23 zip codes a sample of which are; 50131, 50009, 50311 and 50327) dropped their price.

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