The population of Contra Costa county is estimated at 1,138,645 where 666,701 speak English exclusively and 10,100 speak primarily in another language. In 2017 there were 12,626 births and 8,345 deaths in Contra Costa county. Contra Costa county has 202,821 housing units that are owned with a mortgage or a loan, 49,083 that are owned free and clear and 123,460 that are renter occupied.

  The good residents of Contra Costa County filed 543,630 federal tax returns in 2017. This amount represents 3.1% of all California filings and 0.365% of the entire nation. Contra Costa had an astronomical combined total federal tax liability of $11,041,792,000 on earned income of $60,213,891,000. Other notable statistics from Contra Costa County were 27,140 unemployment claims which collected a total of $133,149,000 and 205,800 charitable contributions valued at $1,203,547,000. 206,660 filings from Contra Costa County paid a combined total of $1,488,469,000 in property taxes and 182,510 filings paid $2,478,515,000 on mortgage interest costs.

  In 2010 Contra Costa county had 652 religious congregations with an estimated 403,596 members.
40.7% of the Contra Costa population has a college level Bachelors degree or higher. 10.9% have less than a highschool diploma level education.

About 30% of Contra Costa County voted in the presidential election of 2016. This is a decrease from the 2012 election by 13,960 votes.
At $95,062 the median income is 132.4% of the California average. An estimated 21,418 people claimed to be unemployed last year in Contra Costa, the equivalant of around 3.8% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 4.5%.

Top 15 Industries in Contra Costa County.
Total # Employed	Industry Job Type
50,689	Health care and social assistance
41,494	Retail trade
30,723	Administrative and support and waste management and remediation services
28,949	Administrative and support services
27,719	Accommodation and food services
27,079	Professional, scientific, and technical services
25,825	Food services and drinking places
24,321	Restaurants and other eating places
23,493	Finance and insurance
22,313	Ambulatory health care services
15,118	Manufacturing
13,951	Credit intermediation and related activities
12,520	General medical and surgical hospitals
12,495	Full-service restaurants
12,442	Information

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