The population of Marshall county is estimated at 40,160. In 2017 there were 506 births and 452 deaths in Marshall county. Marshall county has 7,104 housing units that are owned with a mortgage or a loan, 4,289 that are owned free and clear and 4,145 that are renter occupied.

  The residents of Marshall County filed 18,050 federal tax returns in 2017. This amount represents 1.2% of all Iowa filings and 0.012% of the entire nation. Marshall had a combined total federal tax liability of $130,748,000 on earned income of $976,901,000. Other notable statistics from Marshall County were 1,090 unemployment claims which collected a total of $5,310,000 and 3,350 charitable contributions valued at $14,749,000. 3,700 filings from Marshall County paid a combined total of $11,400,000 in property taxes and 2,760 filings paid $13,586,000 on mortgage interest costs.

  In 2010 Marshall county had 63 religious congregations with an estimated 21,837 members.
19.6% of the Marshall population has a college level Bachelors degree or higher. 14.9% have less than a highschool diploma level education.

Approximately 44% of Marshall County voted in the presidential election of 2016. This represents a decrease from the 2012 election by 1,027 votes.
At $50,495 the median income is 86.0% of the Iowa average. An estimated 842 people claimed to be unemployed last year in Marshall, the equivalant of around 4.6% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 4.9%.

Top 15 Industries in Marshall County.
Total # Employed	Industry Job Type
5,011	Manufacturing
2,059	Retail trade
1,930	Health care and social assistance
1,330	Fabricated metal product manufacturing
1,070	Accommodation and food services
953	Food services and drinking places
855	Restaurants and other eating places
536	General merchandise stores
523	Ambulatory health care services
503	Limited-service restaurants
444	Food and beverage stores
415	Supermarkets and other grocery (except convenience) stores
415	Grocery stores
394	Real estate and rental and leasing
359	Nursing care facilities (skilled nursing facilities)

In 2018 the average price reduction was 3.71% in Marshall County.

In 2018 12.36% of listings in Marshall County.

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