In 2018, the U.S. Census Bureau estimated Dallas County to have a total of 2,637,772 residents, 1,027,930 housing units, and 917,276 households.

[18] In 2010, the racial and ethnic makeup of the county was 53.4% White (33.12% non-Hispanic white), 22.30% Black or African American, 0.10% Native American, 5.15% Asian, 0.06% Pacific Islander, 14.04% from other races, and 2.70% from two or more races.

[18] The increase among people of color reflected nationwide demographic trends of greater diversification.

[25] American Community Survey 2023 Data The United States Census Bureau estimated that in 2023, Dallas County’s population was 2,606,358.

The Commissioners' Court sets the county tax rate, adopts the budget, appoints boards and commissions, approves grants and personnel actions, and oversees the administration of county government.

The Commissioners' Court approves the budget and sets the tax rate for the hospital district, which is charged with the responsibility for providing acute medical care for citizens who otherwise would not receive adequate medical services.

In 1963 assassin Lee Harvey Oswald shot President John F. Kennedy from a window located on the sixth floor which today houses the Sixth Floor Museum dedicated to the late president's memory.

Those departments include Dallas County Elections, Health and Human Services, Facilities Management, Parks and Open Space Program, I.T.

Through their budget making powers, the commissioners exercise indirect control over the District Attorney's office, Sheriff, District Clerk, County Clerk and County Treasurer.

[31] Corrections Corporation of America operates the Dawson Unit, a co-gender state jail in Downtown Dallas, under contract.

For most of the second half of the 20th century, it would be one of the most conservative urban counties in the nation, voting for the GOP at every election until 2004.

The lone exception was when Texas native Lyndon B. Johnson successfully ran for a full term as president on the Democratic ticket in 1964.

The last Democratic countywide administrator was D. Connally elected County Surveyor prior to the office's abolition.

In 1996, Bill Clinton became only the fourth Democrat since Truman to win 40 percent of the vote.

Former Governor of Texas George W. Bush managed relatively narrow wins in 2000 and 2004, even as he easily carried the state.

Obama's coattails allowed Democrats to win the remaining Republican held judicial seats.

[33] This was likely due to his increase in Hispanic support, which was 54% in the state of Texas compared to Kamala Harris’s 44%.

In 2016 Eric Nicholson of the Dallas Observer wrote that the bulk of white K-12 enrollment is shifting to more distant suburban areas beyond Dallas County, and that "Teasing out causation is tricky" but that the perception of poverty, which many white families wish to avoid, is tied with race.