Across the nation, U.S. citizens have different political beliefs. Some citizens lean more to the right – or Republican – with conservative values, while others lean more to the left and support the more liberal Democratic party.
While some states are pretty closely divided, there are others where the majority of residents support one party. One of the ways that this is measured is through the Cook Partisan Voting Index, also known as the CPVI. This measures how strongly a state leans toward one party of the other when compared to the entire nation. Following each election, this index is updated to provide the most accurate results.
CPVIs are calculated by taking a look at the average Democratic or Republican share of the last two presidential elections compared to the national average. Results of the CPVI are broken down by congressional district and by state. By using this data, you can quickly determine which states are more Republican or more Democratic.
Based on the latest CPVI data, Wyoming is the most Republican state in the nation. Following behind is Oklahoma, then Utah taking third place. Based on this information, the most Republican states in the United States are:
Wyoming is the most Republican state in the U.S. Wyoming has a Cook Partisan Voting Index of +25. Wyoming’s strong Conservative lean is attributed to its large rural, white, and Evangelical populations. Wyoming has voted Republican in every Presidential election since 1952, except for the 1964 election. In the most recent 2016 election, 67.4% of voters voted for the Republican candidate Donald Trump, a 46% advantage over the Democratic candidate, Hillary Clinton.
Utah is the second-most Republican state with a voting index of +20. Utah is known for being home to the country’s highest Mormon population, resulting in many of its residents being very socially conservative. In the 2016 presidential election, 45.5% of voters voted for Trump, while 27.5% voted for Clinton.
Oklahoma is the third-most Republican state in the United States. Oklahoma’s voting index is +20. Oklahoma has voted Republican in every presidential election since 1952 except for 1964. In the 2016 presidential election, 65.3% of voters voted Republican vs. 28.9% that voted Democratic. Oklahoma there are only four blue counties in the whole state.
West Virginia is the fourth-most Republican state with a voting index of +19. West Virginia has made several shifts between Democratic and Republican since it became a state in 1863, each shift lasting through several elections. West Virginia has voted Republican in every presidential election since 2000. 68.6% of voters voted Republican in the 2016 presidential election vs. 26.5% who voted Democratic.
Idaho is the fifth-most Republican state in the U.S. with a voting index of +19. Generally, people in Idaho are concerned with fiscal issues such as budget deficits and wanting to lower government spending, leading to a conservative way of thinking. Idaho has consistently voted Republican in every presidential election since 1952 except for 1964. 59.3% of voters voted Republican in the most recent presidential election in 2016.
North Dakota is the sixth-most Republican state in the United States. North Dakota has a Republican voting index of +17. Since becoming a state in 1889, North Dakota has participated in 32 presidential elections and has voted Republican in 26 of them. North Dakota has voted Republican in every presidential election since 1968, including the most recent election in 2016, where 63% of voters voted Republican.
Kentucky is the seventh-most Republican state in the U.S. with a voting index of +15. In the 2016 presidential election, Donald Trump defeated Hilary Clinton 62.5% to 32.7%. Kentucky has voted Democratic for long periods in the past; however, the state has voted Republican since the 2000 presidential election. In Kentucky’s most recent Governor election, voters chose Democratic candidates Andy Beshear.
Arkansas is the eighth-most Republican state in the U.S. with a voting index of +15. Arkansas has voted Republican in nine of the last 12 presidential elections except in 1976 for Jimmy Carter and in 1992 and 1996 for fellow Arkansan Bill Clinton. In the last four elections, the Republican margin of victory has increased each election. In 2016, Donald Trump won the election with a vote of 60.6%.
Tennessee is the ninth-most Republican state. Tennessee’s Republican voting index is +14. Tennessee voted almost exclusively Democratic from Reconstruction until after World War II. Since then, Republicans have won almost every election with the exception of four. In 2016, Donald Trump defeated Hilary Clinton by a vote of 60.7% to 34.7%.
South Dakota is tied with Tennessee as the tenth-most Republican state with a voting index of +14. Since becoming a state in 1889, South Dakota has voted Democratic only four times in presidential elections, the last time being in 1964. In the 2016 presidential election, 61.5% of voters voted Republican.
Below is a table of each state's Republican voting index.