The population of Pennington county is estimated at 108,903. In 2017 there were 1,469 births and 893 deaths in Pennington county. Pennington county has 17,968 housing units that are owned with a mortgage or a loan, 8,824 that are owned free and clear and 14,459 that are renter occupied.

  The upstanding residents of Pennington County filed 55,440 federal tax returns in 2017. This amount represents 13.3% of all South Dakota filings and 0.037% of the entire nation. Pennington had a combined total federal tax liability of $524,812,000 on earned income of $3,386,390,000. Other notable statistics from Pennington County were 1,040 unemployment claims which collected a total of $4,263,000 and 8,600 charitable contributions valued at $52,429,000. 9,980 filings from Pennington County paid a combined total of $43,776,000 in property taxes and 8,310 filings paid $61,931,000 on mortgage interest costs.

  In 2010 Pennington county had 119 religious congregations with an estimated 41,612 members.
29.6% of the Pennington population has a college level Bachelors degree or higher. 6.5% have less than a highschool diploma level education.

About 44% of Pennington County voted in the presidential election of 2016. This is an increase from the 2012 election by 3,283 votes.
At $55,104 the median income is 96.9% of the South Dakota average. An estimated 1,892 people claimed to be unemployed last year in Pennington, the equivalant of around 3.4% of the county population. This represents an increase in the level of unemployment from the previous year's value of 3.1%.

Top 15 Industries in Pennington County.
Total # Employed	Industry Job Type
8,278	Retail trade
6,418	Accommodation and food services
4,983	Food services and drinking places
4,485	Restaurants and other eating places
2,893	Finance and insurance
2,498	Full-service restaurants
2,306	Ambulatory health care services
2,115	Manufacturing
1,928	Professional, scientific, and technical services
1,858	Wholesale trade
1,776	General merchandise stores
1,747	Administrative and support and waste management and remediation services
1,676	Limited-service restaurants
1,664	Administrative and support services
1,572	Other services (except public administration)

In 2018 the average price reduction was 2.41% in Pennington County (averaging across 4 zip codes; 57701, 57719 and 57703).

In 2018 12.15% of listings in Pennington County (averaging across 4 zip codes; 57703, 57719 and 57701) dropped their price.

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