Republicans hold a slim majority in the House of Representatives, though the size of that narrow margin will not be known until the final four undecided races are called.

The four House races that remain uncalled as of Wednesday after are in Alaska, California and Iowa. The balance of power currently sits at 218 seats for Republicans, and 213 for the Democrats.

The Associated Press called Ohio's 9th Congressional District for Democratic incumbent Rep. Marcy Kaptur Wednesday.

Democratic incumbent Rep. Mary Sattler Peltola is in a tight race in Alaska’s at-large congressional district, where she is trailing Republican entrepreneur Nick Begich.

As of Wednesday morning, Begich holds just over a 2-point lead at 48.6% of the vote compared to Peltola's 46.2%. The vote count sits at 157,331 to 149,763 with 99% of the vote counted.

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Republican Rep. John Duarte is leading former Democratic state assembly member Adam Gray in California’s 13th Congressional District, but the highly contested race remains uncalled as of Wednesday morning.

Roughly 96% of the vote has been counted, and Duarte holds a slim 50.1% to 49.9% lead. The two candidates are separated by just 227 votes.

Democratic challenger Derek Tran has taken the lead over Republican incumbent Rep. Michelle Steel in the 45th District. Steel had been in the lead by a few hundred votes late last week, but Tran now has a razor-thin 314-vote lead.

Roughly 97% of the vote has been counted for the district.

Republican incumbent Rep. Mariannet Miller-Meeks holds a less than 1% lead over challenger Christina Bohannan with 99% of the vote counted. Miller-Meeks' lead sits at just over 800 votes.

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Bohannan has requested a recount in her bid to unseat Miller-Meeks. The Associated Press has not yet called the race because the margin was close enough that it could prompt a recount. Miller-Meeks has declared victory and said she was confident in her lead.

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Fox News' Anders Hagstrom, Chris Pandolfo and Jasmine Baehr and the Associated Press contributed to this report.