AUSTIN — By the end of 12 days of early voting, 529,521 Dallas County residents had cast their ballots in the midterm elections — more than twice that of the 2014 and 2010 midterms.

The total is about 40 percent of the county's 1.3 million registered voters. It was about 20,000 shy of the early-voting total in 2016, a presidential election year in which turnout is traditionally much stronger.

In 2010, Dallas County had 218,156 early votes, and in 2014 there were 215,147.

On Friday, El Paso Rep. Beto O'Rourke said the voter turnout signifies that he's on the verge of making history as the first Democrat to win a statewide office in Texas since 1994.

"If North Texas continues to turn out in the record numbers that we've seen, shattering every midterm total for as long as we've been looking at them, in some cases rivaling presidential voter turnout, then we're going to win this race," O'Rourke said. "The best thing I can do is continue to be with the people of North Texas, just as we have been for almost the last two years."

But Republicans, while impressed with O'Rourke's effort, said the race is Cruz's to lose. Historically there are more Republicans in the Texas electorate than Democrats.

Counties across Texas also saw record-breaking early-voter turnout.

From the top 30 counties with the most registered voters, 4.8 million people voted early this year. This outnumbers the 4.7 million early and Election Day votes in the 2014 midterms.

Tarrant County had 465,817 votes, Collin 286,393 and Denton 228,650.

A record number of Texans registered to vote in the November election: 15,793,257.

Election Day is Tuesday. Dallas County residents can vote at their precinct polling locations from 7 a.m. to 7 p.m. Read more about what you need to know to vote and how to find your polling place here.