The race between President Donald Trump and former Vice President Joe Biden remains too close to call Thursday, as votes continued to be counted in crucial swing states Nevada and Pennsylvania.

Much of the attention has been focused on the two states, as Biden has 253 electoral votes, while Trump has 214. If Biden wins Pennsylvania (20 electoral votes), he would win the presidency. Also, if Biden wins Nevada (6 electoral votes), he would be considered the winner if he maintains his lead in Arizona (11 electoral votes). The Associated Press and Fox News have both projected Biden the winner in Arizona.

Clark County, which includes the city of Las Vegas, will release results from 51,000 votes on Friday, according to reports.

In addition, Clark County Registrar Joe Gloria said, "The bulk of our ballots we're hoping will be read by Saturday or Sunday this weekend."

Clark County mail-in results have been favoring Biden.

Beyond the 63,000 votes in-house in Clark County, there are also 60,000 outstanding provisional ballots, which will be counted in the coming days.

As of Thursday at 3:35 p.m. ET, Biden leads Trump 49.4% to 48.5% in Nevada, according to the New York Times.

In Pennsylvania, Trump leads Biden 50.2% to 48.5%.

Pennsylvania Secretary of State Kathy Boockvar said the state could announce a winner as soon as Thursday night. By noon on Thursday, Pennsylvania had counted 86% of its mail-in ballots.

“I think there’s about 550,000 some odd — you know, plus or minus — ballots that are still in the process of being counted today," Boockvar told CNN's Jake Tapper.

“Some of those may have already been counted but are not yet uploaded. But yeah, they’re coming in. We’re getting 10,000 here, 20,000 here, counties are furiously at work," she said.

Trump has a lead of a little more than 108,000 votes in Pennsylvania. This lead is expected to shrink as more ballots from Democratic-leaning areas continue to be counted.