What are swing states?

Swing states are states where both major political parties have realistic chances of winning, making them especially important in close presidential elections. Because most states use winner-take-all rules to allocate electoral votes, the outcome in swing states often determines who wins the presidency. Swing states are also called battleground states or purple states (combining the red of Republicans and the blue of Democrats).

Which states are swing states changes over time as demographics, economic conditions, and political coalitions shift. Florida, for example, was considered a key swing state in the 2000s and 2010s but has become more reliably Republican in recent elections. Ohio, long a classic swing state that voted for the winner of every presidential election from 1964 to 2016, has also moved toward the Republican column. Other states, such as Arizona and Georgia, have moved from reliably Republican to competitive battleground status.

Recent swing states in U.S. presidential elections have included Pennsylvania, Michigan, Wisconsin, Arizona, Georgia, Nevada, North Carolina, and sometimes Florida and Ohio. The 2024 election was largely decided by results in Pennsylvania, Michigan, Wisconsin, Arizona, Georgia, Nevada, and North Carolina. Together these seven states held about 93 electoral votes and had margins under five percent in most cases. Donald Trump won all seven, sweeping the swing states for the first time since 2008.

Swing states receive disproportionate attention from presidential candidates. Campaigns spend the bulk of their advertising budgets, candidate visits, and ground organization in swing states because that is where elections are won or lost. Voters in non-swing states, by contrast, see far fewer political ads and candidate visits, even though they vote in the same election.

Demographic and economic factors that have shaped recent swing states include the suburban shift toward Democrats among college-educated voters, the rural shift toward Republicans among non-college-educated white voters, growing Hispanic and Asian American populations, and shifts among Black voters in urban and southern states. Pennsylvania has become particularly important, sometimes called the Tipping Point State because of how often it is the deciding state in close presidential elections.

The concentration of campaign attention in a handful of swing states is one of the criticisms leveled at the Electoral College system. Reform proposals such as the National Popular Vote Interstate Compact aim to make every vote count equally regardless of state.