[2] They host the biennial state conventions in odd-numbered years, in which they elect executive officers and delegates to the Republican National Committee.

Despite the dominance of Republicans as governor and delegate, the two main parties had almost reached parity in the territorial legislature by statehood.

In the 1928 election, Republicans gained 26 new seats in the Oklahoma House of Representatives due in part to the low popularity of the time of presidential candidate Al Smith and the incumbent governor's stumping on his behalf.

[3] Beginning in the 1960s, the Oklahoma Republican party made gains in voter registration and state legislative seats.

[9] Henry Bellmon won election as Oklahoma's first Republican governor in 1962, by appealing to Democratic voters and as an anti-corruption candidate.

[10] Bellmon also oversaw the racial integration of Oklahoma schools and the court-ordered reapportionment of the state electoral districts.

[14] After Joe Biden won the 2020 election and Donald Trump refused to concede while making false claims of fraud, Oklahoma Republican Party head John R. Bennett said he would support a primary challenge against incumbent Oklahoma Senator James Lankford because Lankford refused to object to the certification of the Electoral College results in Congress.

The post was denounced by many high-ranking members of the Oklahoma Republican Party including Governor Kevin Stitt, Lt.

It’s about a totalitarian government.”[19] The same day The Norman Transcript reported a majority of Republicans are unhappy with Bennett and that plans were in the works to remove him from office.

[21] Note: Lieutenant Governor Jari Askins provided tie breaking vote in the State Senate following the 2006 elections, giving Democrats a majority As of 2023, the Oklahoma Republican Party controls all 12 statewide executive offices and holds majorities in both the Oklahoma Senate and the Oklahoma House of Representatives; Republicans also hold both of the state's U.S. Senate seats and all five of the state's U.S. House seats.