The population of Saint Clair county is estimated at 263,120. In 2017 there were 3,305 births and 2,637 deaths in Saint Clair county. Saint Clair county has 48,475 housing units that are owned with a mortgage or a loan, 21,171 that are owned free and clear and 35,399 that are renter occupied.

  The upstanding residents of Saint Clair County filed 120,780 federal tax returns in 2017. This amount represents 2.0% of all Illinois filings and 0.081% of the entire nation. Saint Clair had a combined total federal tax liability of $1,057,374,000 on earned income of $6,924,342,000. Other notable statistics from Saint Clair County were 4,660 unemployment claims which collected a total of $22,144,000 and 23,920 charitable contributions valued at $117,154,000. 27,070 filings from Saint Clair County paid a combined total of $124,932,000 in property taxes and 24,090 filings paid $147,135,000 on mortgage interest costs.

  In 2010 Saint Clair county had 309 religious congregations with an estimated 136,200 members.
26.6% of the Saint Clair population has a college level Bachelors degree or higher. 9.3% have less than a highschool diploma level education.

Approximately 45% of Saint Clair County voted in the presidential election of 2016. This represents an increase from the 2012 election by 822 votes.
At $51,937 the median income is 82.4% of the Illinois average. An estimated 6,192 people claimed to be unemployed last year in Saint Clair, the equivalant of around 4.9% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 6.0%.

Top 15 Industries in Saint Clair County.
Total # Employed	Industry Job Type
15,933	Health care and social assistance
13,296	Retail trade
10,416	Accommodation and food services
9,226	Food services and drinking places
7,742	Restaurants and other eating places
5,757	Ambulatory health care services
5,662	Professional, scientific, and technical services
4,922	Manufacturing
4,519	Transportation and warehousing
4,165	Hospitals
4,165	General medical and surgical hospitals
4,165	General medical and surgical hospitals, except government
4,158	Administrative and support and waste management and remediation services
4,078	Full-service restaurants
3,620	Administrative and support services

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