Oklahoma's 1st congressional district is in the northeastern corner of the state. Anchored by Tulsa, it is largely coextensive with the Tulsa metropolitan area. The district contains all of Tulsa County as well as portions of Creek, Rogers & Wagoner counties. Although it has long been reckoned as the Tulsa district, a small portion of Tulsa itself is located in the 3rd district.

Oklahoma's 3rd congressional district is the largest congressional district in the state, covering an area of 34,088.49 square miles, over 48 percent the state's land mass. The district is bordered by New Mexico, Colorado, Kansas, and the Texas panhandle. Altogether, the district includes a total of 32 counties, and covers more territory than the state's other four districts combined. It is one of the largest districts in the nation that does not cover an entire state.