The population of Foster county is estimated at 3,310. In 2017 there were 37 births and 42 deaths in Foster county. Foster county has 506 housing units that are owned with a mortgage or a loan, 607 that are owned free and clear and 382 that are renter occupied.

  The good residents of Foster County filed 1,640 federal tax returns in 2017. This amount represents 0.5% of all North Dakota filings and 0.001% of the entire nation. Foster had a combined total federal tax liability of $13,661,000 on earned income of $115,801,000. Other notable statistics from Foster County were 40 unemployment claims which collected a total of $191,000 and 130 charitable contributions valued at $814,000. 120 filings from Foster County paid a combined total of $361,000 in property taxes and 90 filings paid $601,000 on mortgage interest costs.

  In 2010 Foster county had 15 religious congregations with an estimated 4,726 members.
23.7% of the Foster population has a college level Bachelors degree or higher. 11.2% have less than a highschool diploma level education.

Approximately 51% of Foster County voted in the presidential election of 2016. This is an increase from the 2012 election by 25 votes.
At $58,752 the median income is 94.2% of the North Dakota average. An estimated 41 people claimed to be unemployed last year in Foster, the equivalant of around 2.4% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 3.0%.

Top 15 Industries in Foster County.
Total # Employed	Industry Job Type
302	Health care and social assistance
247	Retail trade
125	Accommodation and food services
119	Wholesale trade
100	Restaurants and other eating places
75	Merchant wholesalers, durable goods
61	Machinery, equipment, and supplies merchant wholesalers
61	Farm and garden machinery and equipment merchant wholesalers
61	Farm machinery and equipment merchant wholesalers- farm dealers
59	Finance and insurance
56	Motor vehicle and parts dealers
44	Credit intermediation and related activities
44	Merchant wholesalers, nondurable goods
43	Food and beverage stores
35	Gasoline stations

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