The population of Williamson county is estimated at 67,640. In 2017 there were 819 births and 777 deaths in Williamson county. Williamson county has 11,287 housing units that are owned with a mortgage or a loan, 8,316 that are owned free and clear and 7,818 that are renter occupied.

  The residents of Williamson County filed 29,760 federal tax returns in 2017. This amount represents 0.5% of all Illinois filings and 0.020% of the entire nation. Williamson had a combined total federal tax liability of $235,229,000 on earned income of $1,575,911,000. Other notable statistics from Williamson County were 1,470 unemployment claims which collected a total of $8,156,000 and 4,440 charitable contributions valued at $24,136,000. 5,330 filings from Williamson County paid a combined total of $21,396,000 in property taxes and 4,260 filings paid $24,615,000 on mortgage interest costs.

  In 2010 Williamson county had 129 religious congregations with an estimated 29,563 members.
22.5% of the Williamson population has a college level Bachelors degree or higher. 9.1% have less than a highschool diploma level education.

Approximately 46% of Williamson County voted in the presidential election of 2016. This represents an increase from the 2012 election by 2,343 votes.
At $49,993 the median income is 79.3% of the Illinois average. An estimated 1,601 people claimed to be unemployed last year in Williamson, the equivalant of around 5.1% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 6.1%.

Top 15 Industries in Williamson County.
Total # Employed	Industry Job Type
5,977	Health care and social assistance
3,783	Retail trade
2,724	Accommodation and food services
2,498	Food services and drinking places
2,352	Ambulatory health care services
2,302	Restaurants and other eating places
1,748	Manufacturing
1,364	Finance and insurance
1,130	Limited-service restaurants
1,110	Full-service restaurants
1,028	General merchandise stores
966	Administrative and support and waste management and remediation services
833	Offices of physicians
815	Transportation and warehousing
723	Wholesale trade

In 2018 the average price reduction was 2.81% in Williamson County.

In 2018 10.26% of listings in Williamson County (averaging across 3 zip codes; 62918 and 62948) dropped their price.

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