As of May 2026, 4 states have two U.S. senators from different parties. Those states are Maine, Pennsylvania, and Wisconsin, with the count reflecting the latest available reporting on split Senate delegations.

Quick Scoop

This is a very small share of the country because each state elects two senators, but most states now send senators from the same party. In the latest data, 25 states had two Republican senators, 21 had two Democratic senators, and 4 had a mixed pair.

What that means

A “different parties” setup means one senator is a Republican and the other is a Democrat, or an independent aligned with one side plus a senator from the other party, depending on how the delegation is counted. Recent reporting shows this has become rarer over time, reaching one of the lowest levels in modern history.

TL;DR

  • Answer: 4 states.
  • The number has fallen sharply in recent years.
  • Mixed Senate delegations are now uncommon compared with past decades.