Oklahoma's 2nd congressional district is one of five United States congressional districts in Oklahoma and covers approximately one-fourth of the state in the east. The district borders Arkansas, Kansas, Missouri, and Texas and includes a total of 24 counties. With a Cook Partisan Voting Index rating of R+29, it is the most Republican district in Oklahoma, a state with an all-Republican congressional delegation.

Delaware County is a county located in the U.S. state of Oklahoma. As of the 2020 census, the population was 40,397. Its county seat is Jay. The county was named for the Delaware Indians, who had established a village in the area prior to the Cherokees being assigned to relocate to Indian Territory in the 1830s. Delaware County was created in 1907. Prior to becoming Delaware County, a large portion of the area was known as the Delaware District of the Cherokee Nation. Today, Delaware County continues to be recognized by the Cherokee Nation as the Delaware District.