AUSTIN (CBSDFW.COM/AP) — Nearly 690,000 people in Texas’ 30 largest counties cast ballots on the first day of early voting, with many areas far exceeding early balloting’s opening day from the last midterm elections in 2014.

Secretary of State data released Tuesday showed that the combined number of in-person and mail-in ballots cast Monday represented about 5.6 percent of the around 12.2 million total registered voters in those counties.

Harris County, the state’s largest, Travis County, which includes Austin, Bexar County, home to San Antonio, Tarrant County, encompassing Fort Worth, and Dallas County all had first-day early voting totals higher than early voting’s first day in 2014.

In Dallas County, more than 59,000 people voted. In Tarrant County, more than 40,000 people voted. In Collin County, more than 30,000 people voted.

This cycle’s top race pits Republican Sen. Ted Cruz against El Paso Democratic Rep. Beto O’Rourke.

Early voting ends Nov. 2. Election Day is Nov. 6.

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)