Of the counties with near-complete results, more than 90 percent have swung in favor of former President Donald J. Trump in the 2024 presidential election, according to a Times analysis of election results early Wednesday.

Mr. Trump improved his margin in 2,367 counties in 2020. His lead only narrowed in 240 counties. In 536 counties, too few votes were counted to be included in the analysis.

Support for Mr. Trump has fluctuated back and forth during his three consecutive presidential elections, but early results showed that even a number of states where Vice President Kamala Harris was ahead shifted to the right.

Mr. Trump appeared to improve his election night performance in many constituencies, including those that had supported him in past elections as well as those that have historically leaned Democratic.

The Times had not yet called the election as of early Wednesday morning, but Mr. Trump was close to victory, having won three of the seven swing states.