As of the latest available figures I found, there are about 39.2 million registered Republicans in the United States, based on data compiled by USAFacts for April 2026.

Context

  • These counts only include states that report party affiliation in voter registration records, so they are not a full national tally from every state.
  • Other recent sources put the number in a similar range, roughly 37.4 million to 38.8 million depending on the month and methodology.

Why the number varies

  • Some states do not register voters by party, which lowers the nationwide total in datasets that rely on state registration records.
  • Updated state reports can change the estimate month to month.

Quick read

For a simple answer: about 39 million registered Republicans in the U.S. is a solid current estimate.